2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
47 #include "lttng-sessiond.h"
58 #define CONSUMERD_FILE "lttng-consumerd"
60 struct consumer_data
{
61 enum lttng_consumer_type type
;
63 pthread_t thread
; /* Worker thread interacting with the consumer */
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex
;
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path
[PATH_MAX
];
75 char cmd_unix_sock_path
[PATH_MAX
];
79 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
80 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
81 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
82 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
85 int opt_verbose
; /* Not static for lttngerr.h */
86 int opt_verbose_consumer
; /* Not static for lttngerr.h */
87 int opt_quiet
; /* Not static for lttngerr.h */
90 const char *opt_tracing_group
;
91 static int opt_sig_parent
;
92 static int opt_daemon
;
93 static int opt_no_kernel
;
94 static int is_root
; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid
; /* Parent PID for --sig-parent option */
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data
= {
100 .type
= LTTNG_CONSUMER_KERNEL
,
101 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
102 .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
,
109 static struct consumer_data ustconsumer32_data
= {
110 .type
= LTTNG_CONSUMER32_UST
,
111 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
115 static int dispatch_thread_exit
;
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path
[PATH_MAX
];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path
[PATH_MAX
];
121 /* global wait shm path for UST */
122 static char wait_shm_path
[PATH_MAX
];
124 /* Sockets and FDs */
125 static int client_sock
;
126 static int apps_sock
;
127 static int kernel_tracer_fd
;
128 static int kernel_poll_pipe
[2];
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
134 static int thread_quit_pipe
[2];
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
140 static int apps_cmd_pipe
[2];
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread
;
144 static pthread_t reg_apps_thread
;
145 static pthread_t client_thread
;
146 static pthread_t kernel_thread
;
147 static pthread_t dispatch_thread
;
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
157 static struct ust_cmd_queue ust_cmd_queue
;
160 * Pointer initialized before thread creation.
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
169 static struct ltt_session_list
*session_list_ptr
;
171 int ust_consumerd64_fd
= -1;
172 int ust_consumerd32_fd
= -1;
174 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
175 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
176 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
177 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
180 void setup_consumerd_path(void)
182 const char *bin
, *libdir
;
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin
[0]) {
191 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
193 if (!consumerd32_libdir
[0]) {
194 consumerd32_libdir
= INSTALL_LIB_PATH
;
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin
[0]) {
198 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
200 if (!consumerd64_libdir
[0]) {
201 consumerd64_libdir
= INSTALL_LIB_PATH
;
204 #error "Unknown bitness"
208 * runtime env. var. overrides the build default.
210 bin
= getenv("LTTNG_CONSUMERD32_BIN");
212 consumerd32_bin
= bin
;
214 bin
= getenv("LTTNG_CONSUMERD64_BIN");
216 consumerd64_bin
= bin
;
218 libdir
= getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
220 consumerd32_libdir
= libdir
;
222 libdir
= getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
224 consumerd64_libdir
= libdir
;
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
231 static int create_thread_poll_set(struct lttng_poll_event
*events
,
236 if (events
== NULL
|| size
== 0) {
241 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
247 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
259 * Check if the thread quit pipe was triggered.
261 * Return 1 if it was triggered else 0;
263 static int check_thread_quit_pipe(int fd
, uint32_t events
)
265 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
273 * Return group ID of the tracing group or -1 if not found.
275 static gid_t
allowed_group(void)
279 if (opt_tracing_group
) {
280 grp
= getgrnam(opt_tracing_group
);
282 grp
= getgrnam(default_tracing_group
);
292 * Init thread quit pipe.
294 * Return -1 on error or 0 if all pipes are created.
296 static int init_thread_quit_pipe(void)
300 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
302 perror("thread quit pipe");
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
314 static void teardown_kernel_session(struct ltt_session
*session
)
316 if (!session
->kernel_session
) {
317 DBG3("No kernel session when tearingdown session");
321 DBG("Tearing down kernel session");
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
327 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
328 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
331 trace_kernel_destroy_session(session
->kernel_session
);
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
338 static void teardown_ust_session(struct ltt_session
*session
)
342 if (!session
->ust_session
) {
343 DBG3("No UST session when tearingdown session");
347 DBG("Tearing down UST session(s)");
349 ret
= ust_app_destroy_trace_all(session
->ust_session
);
351 ERR("Error in ust_app_destroy_trace_all");
354 trace_ust_destroy_session(session
->ust_session
);
358 * Stop all threads by closing the thread quit pipe.
360 static void stop_threads(void)
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
368 ERR("write error on thread quit pipe");
371 /* Dispatch thread */
372 dispatch_thread_exit
= 1;
373 futex_nto1_wake(&ust_cmd_queue
.futex
);
379 static void cleanup(void)
383 struct ltt_session
*sess
, *stmp
;
387 DBG("Removing %s directory", rundir
);
388 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
390 ERR("asprintf failed. Something is really wrong!");
393 /* Remove lttng run directory */
396 ERR("Unable to clean %s", rundir
);
400 DBG("Cleaning up all session");
402 /* Destroy session list mutex */
403 if (session_list_ptr
!= NULL
) {
404 pthread_mutex_destroy(&session_list_ptr
->lock
);
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess
, stmp
,
408 &session_list_ptr
->head
, list
) {
409 teardown_kernel_session(sess
);
410 teardown_ust_session(sess
);
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
418 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
420 if (is_root
&& !opt_no_kernel
) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd
);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
427 close(thread_quit_pipe
[0]);
428 close(thread_quit_pipe
[1]);
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
438 * Send data on a unix socket using the liblttsessiondcomm API.
440 * Return lttcomm error code.
442 static int send_unix_sock(int sock
, void *buf
, size_t len
)
444 /* Check valid length */
449 return lttcomm_send_unix_sock(sock
, buf
, len
);
453 * Free memory of a command context structure.
455 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
457 DBG("Clean command context structure");
459 if ((*cmd_ctx
)->llm
) {
460 free((*cmd_ctx
)->llm
);
462 if ((*cmd_ctx
)->lsm
) {
463 free((*cmd_ctx
)->lsm
);
471 * Send all stream fds of kernel channel to the consumer.
473 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
474 int sock
, struct ltt_kernel_channel
*channel
,
475 uid_t uid
, gid_t gid
)
478 struct ltt_kernel_stream
*stream
;
479 struct lttcomm_consumer_msg lkm
;
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel
->channel
->name
);
485 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
486 lkm
.u
.channel
.channel_key
= channel
->fd
;
487 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
488 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
490 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
492 perror("send consumer channel");
497 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
501 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
502 lkm
.u
.stream
.channel_key
= channel
->fd
;
503 lkm
.u
.stream
.stream_key
= stream
->fd
;
504 lkm
.u
.stream
.state
= stream
->state
;
505 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
506 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
507 lkm
.u
.stream
.uid
= uid
;
508 lkm
.u
.stream
.gid
= gid
;
509 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
510 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
512 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
514 perror("send consumer stream");
517 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
519 perror("send consumer stream ancillary data");
524 DBG("consumer channel streams sent");
533 * Send all stream fds of the kernel session to the consumer.
535 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
536 struct ltt_kernel_session
*session
)
539 struct ltt_kernel_channel
*chan
;
540 struct lttcomm_consumer_msg lkm
;
541 int sock
= session
->consumer_fd
;
543 DBG("Sending metadata stream fd");
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session
->consumer_fd
== 0) {
547 session
->consumer_fd
= consumer_data
->cmd_sock
;
550 if (session
->metadata_stream_fd
!= 0) {
551 /* Send metadata channel fd */
552 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
553 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
554 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
555 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
557 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
559 perror("send consumer channel");
563 /* Send metadata stream fd */
564 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
565 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
566 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
567 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
568 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
569 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
570 lkm
.u
.stream
.uid
= session
->uid
;
571 lkm
.u
.stream
.gid
= session
->gid
;
572 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
573 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
575 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
577 perror("send consumer stream");
580 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
582 perror("send consumer stream");
587 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
588 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
589 session
->uid
, session
->gid
);
595 DBG("consumer fds (metadata and channel streams) sent");
604 * Notify UST applications using the shm mmap futex.
606 static int notify_ust_apps(int active
)
610 DBG("Notifying applications of session daemon state: %d", active
);
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
614 if (wait_shm_mmap
== NULL
) {
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
621 /* Apps notified successfully */
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
633 * Return total size of the buffer pointed by buf.
635 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
641 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
642 if (cmd_ctx
->llm
== NULL
) {
648 /* Copy common data */
649 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
650 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
652 cmd_ctx
->llm
->data_size
= size
;
653 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
665 static int update_kernel_poll(struct lttng_poll_event
*events
)
668 struct ltt_session
*session
;
669 struct ltt_kernel_channel
*channel
;
671 DBG("Updating kernel poll set");
674 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
675 session_lock(session
);
676 if (session
->kernel_session
== NULL
) {
677 session_unlock(session
);
681 cds_list_for_each_entry(channel
,
682 &session
->kernel_session
->channel_list
.head
, list
) {
683 /* Add channel fd to the kernel poll set */
684 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
686 session_unlock(session
);
689 DBG("Channel fd %d added to kernel set", channel
->fd
);
691 session_unlock(session
);
693 session_unlock_list();
698 session_unlock_list();
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
706 * Useful for CPU hotplug feature.
708 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
711 struct ltt_session
*session
;
712 struct ltt_kernel_channel
*channel
;
714 DBG("Updating kernel streams for channel fd %d", fd
);
717 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
718 session_lock(session
);
719 if (session
->kernel_session
== NULL
) {
720 session_unlock(session
);
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session
->kernel_session
->consumer_fd
== 0) {
726 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
729 cds_list_for_each_entry(channel
,
730 &session
->kernel_session
->channel_list
.head
, list
) {
731 if (channel
->fd
== fd
) {
732 DBG("Channel found, updating kernel streams");
733 ret
= kernel_open_channel_stream(channel
);
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
743 if (session
->kernel_session
->consumer_fds_sent
== 1) {
744 ret
= send_kconsumer_channel_streams(consumer_data
,
745 session
->kernel_session
->consumer_fd
, channel
,
746 session
->uid
, session
->gid
);
754 session_unlock(session
);
756 session_unlock_list();
760 session_unlock(session
);
761 session_unlock_list();
766 * For each tracing session, update newly registered apps.
768 static void update_ust_app(int app_sock
)
770 struct ltt_session
*sess
, *stmp
;
772 /* For all tracing session(s) */
773 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
774 if (sess
->ust_session
) {
775 ust_app_global_update(sess
->ust_session
, app_sock
);
781 * This thread manage event coming from the kernel.
783 * Features supported in this thread:
786 static void *thread_manage_kernel(void *data
)
788 int ret
, i
, pollfd
, update_poll_flag
= 1;
789 uint32_t revents
, nb_fd
;
791 struct lttng_poll_event events
;
793 DBG("Thread manage kernel started");
795 ret
= create_thread_poll_set(&events
, 2);
800 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
806 if (update_poll_flag
== 1) {
808 * Reset number of fd in the poll set. Always 2 since there is the thread
809 * quit pipe and the kernel pipe.
813 ret
= update_kernel_poll(&events
);
817 update_poll_flag
= 0;
820 nb_fd
= LTTNG_POLL_GETNB(&events
);
822 DBG("Thread kernel polling on %d fds", nb_fd
);
824 /* Zeroed the poll events */
825 lttng_poll_reset(&events
);
827 /* Poll infinite value of time */
828 ret
= lttng_poll_wait(&events
, -1);
831 } else if (ret
== 0) {
832 /* Should not happen since timeout is infinite */
833 ERR("Return value of poll is 0 with an infinite timeout.\n"
834 "This should not have happened! Continuing...");
838 for (i
= 0; i
< nb_fd
; i
++) {
839 /* Fetch once the poll data */
840 revents
= LTTNG_POLL_GETEV(&events
, i
);
841 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
843 /* Thread quit pipe has been closed. Killing thread. */
844 ret
= check_thread_quit_pipe(pollfd
, revents
);
849 /* Check for data on kernel pipe */
850 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
851 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
852 update_poll_flag
= 1;
856 * New CPU detected by the kernel. Adding kernel stream to
857 * kernel session and updating the kernel consumer
859 if (revents
& LPOLLIN
) {
860 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
866 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
867 * and unregister kernel stream at this point.
875 DBG("Kernel thread dying");
876 close(kernel_poll_pipe
[0]);
877 close(kernel_poll_pipe
[1]);
879 lttng_poll_clean(&events
);
885 * This thread manage the consumer error sent back to the session daemon.
887 static void *thread_manage_consumer(void *data
)
889 int sock
= 0, i
, ret
, pollfd
;
890 uint32_t revents
, nb_fd
;
891 enum lttcomm_return_code code
;
892 struct lttng_poll_event events
;
893 struct consumer_data
*consumer_data
= data
;
895 DBG("[thread] Manage consumer started");
897 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
903 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
904 * Nothing more will be added to this poll set.
906 ret
= create_thread_poll_set(&events
, 2);
911 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
916 nb_fd
= LTTNG_POLL_GETNB(&events
);
918 /* Inifinite blocking call, waiting for transmission */
919 ret
= lttng_poll_wait(&events
, -1);
924 for (i
= 0; i
< nb_fd
; i
++) {
925 /* Fetch once the poll data */
926 revents
= LTTNG_POLL_GETEV(&events
, i
);
927 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret
= check_thread_quit_pipe(pollfd
, revents
);
935 /* Event on the registration socket */
936 if (pollfd
== consumer_data
->err_sock
) {
937 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
938 ERR("consumer err socket poll error");
944 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
949 DBG2("Receiving code from consumer err_sock");
951 /* Getting status code from kconsumerd */
952 ret
= lttcomm_recv_unix_sock(sock
, &code
,
953 sizeof(enum lttcomm_return_code
));
958 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
959 consumer_data
->cmd_sock
=
960 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
961 if (consumer_data
->cmd_sock
< 0) {
962 sem_post(&consumer_data
->sem
);
963 PERROR("consumer connect");
966 /* Signal condition to tell that the kconsumerd is ready */
967 sem_post(&consumer_data
->sem
);
968 DBG("consumer command socket ready");
970 ERR("consumer error when waiting for SOCK_READY : %s",
971 lttcomm_get_readable_code(-code
));
975 /* Remove the kconsumerd error sock since we've established a connexion */
976 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
981 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
986 /* Update number of fd */
987 nb_fd
= LTTNG_POLL_GETNB(&events
);
989 /* Inifinite blocking call, waiting for transmission */
990 ret
= lttng_poll_wait(&events
, -1);
995 for (i
= 0; i
< nb_fd
; i
++) {
996 /* Fetch once the poll data */
997 revents
= LTTNG_POLL_GETEV(&events
, i
);
998 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret
= check_thread_quit_pipe(pollfd
, revents
);
1006 /* Event on the kconsumerd socket */
1007 if (pollfd
== sock
) {
1008 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1009 ERR("consumer err socket second poll error");
1015 /* Wait for any kconsumerd error */
1016 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1017 sizeof(enum lttcomm_return_code
));
1019 ERR("consumer closed the command socket");
1023 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1026 DBG("consumer thread dying");
1027 close(consumer_data
->err_sock
);
1028 close(consumer_data
->cmd_sock
);
1031 unlink(consumer_data
->err_unix_sock_path
);
1032 unlink(consumer_data
->cmd_unix_sock_path
);
1033 consumer_data
->pid
= 0;
1035 lttng_poll_clean(&events
);
1041 * This thread manage application communication.
1043 static void *thread_manage_apps(void *data
)
1046 uint32_t revents
, nb_fd
;
1047 struct ust_command ust_cmd
;
1048 struct lttng_poll_event events
;
1050 DBG("[thread] Manage application started");
1052 rcu_register_thread();
1053 rcu_thread_online();
1055 ret
= create_thread_poll_set(&events
, 2);
1060 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1066 /* Zeroed the events structure */
1067 lttng_poll_reset(&events
);
1069 nb_fd
= LTTNG_POLL_GETNB(&events
);
1071 DBG("Apps thread polling on %d fds", nb_fd
);
1073 /* Inifinite blocking call, waiting for transmission */
1074 ret
= lttng_poll_wait(&events
, -1);
1079 for (i
= 0; i
< nb_fd
; i
++) {
1080 /* Fetch once the poll data */
1081 revents
= LTTNG_POLL_GETEV(&events
, i
);
1082 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1084 /* Thread quit pipe has been closed. Killing thread. */
1085 ret
= check_thread_quit_pipe(pollfd
, revents
);
1090 /* Inspect the apps cmd pipe */
1091 if (pollfd
== apps_cmd_pipe
[0]) {
1092 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1093 ERR("Apps command pipe error");
1095 } else if (revents
& LPOLLIN
) {
1097 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1098 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1099 perror("read apps cmd pipe");
1103 /* Register applicaton to the session daemon */
1104 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1106 if (ret
== -ENOMEM
) {
1108 } else if (ret
< 0) {
1113 * Add channel(s) and event(s) to newly registered apps
1114 * from lttng global UST domain.
1116 update_ust_app(ust_cmd
.sock
);
1118 ret
= ust_app_register_done(ust_cmd
.sock
);
1121 * If the registration is not possible, we simply
1122 * unregister the apps and continue
1124 ust_app_unregister(ust_cmd
.sock
);
1127 * We just need here to monitor the close of the UST
1128 * socket and poll set monitor those by default.
1130 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1135 DBG("Apps with sock %d added to poll set",
1143 * At this point, we know that a registered application made
1144 * the event at poll_wait.
1146 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1147 /* Removing from the poll set */
1148 ret
= lttng_poll_del(&events
, pollfd
);
1153 /* Socket closed on remote end. */
1154 ust_app_unregister(pollfd
);
1162 DBG("Application communication apps dying");
1163 close(apps_cmd_pipe
[0]);
1164 close(apps_cmd_pipe
[1]);
1166 lttng_poll_clean(&events
);
1168 rcu_thread_offline();
1169 rcu_unregister_thread();
1174 * Dispatch request from the registration threads to the application
1175 * communication thread.
1177 static void *thread_dispatch_ust_registration(void *data
)
1180 struct cds_wfq_node
*node
;
1181 struct ust_command
*ust_cmd
= NULL
;
1183 DBG("[thread] Dispatch UST command started");
1185 while (!dispatch_thread_exit
) {
1186 /* Atomically prepare the queue futex */
1187 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1190 /* Dequeue command for registration */
1191 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1193 DBG("Woken up but nothing in the UST command queue");
1194 /* Continue thread execution */
1198 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1200 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1201 " gid:%d sock:%d name:%s (version %d.%d)",
1202 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1203 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1204 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1205 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1207 * Inform apps thread of the new application registration. This
1208 * call is blocking so we can be assured that the data will be read
1209 * at some point in time or wait to the end of the world :)
1211 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1212 sizeof(struct ust_command
));
1214 perror("write apps cmd pipe");
1215 if (errno
== EBADF
) {
1217 * We can't inform the application thread to process
1218 * registration. We will exit or else application
1219 * registration will not occur and tracing will never
1226 } while (node
!= NULL
);
1228 /* Futex wait on queue. Blocking call on futex() */
1229 futex_nto1_wait(&ust_cmd_queue
.futex
);
1233 DBG("Dispatch thread dying");
1238 * This thread manage application registration.
1240 static void *thread_registration_apps(void *data
)
1242 int sock
= 0, i
, ret
, pollfd
;
1243 uint32_t revents
, nb_fd
;
1244 struct lttng_poll_event events
;
1246 * Get allocated in this thread, enqueued to a global queue, dequeued and
1247 * freed in the manage apps thread.
1249 struct ust_command
*ust_cmd
= NULL
;
1251 DBG("[thread] Manage application registration started");
1253 ret
= lttcomm_listen_unix_sock(apps_sock
);
1259 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1260 * more will be added to this poll set.
1262 ret
= create_thread_poll_set(&events
, 2);
1267 /* Add the application registration socket */
1268 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1273 /* Notify all applications to register */
1274 ret
= notify_ust_apps(1);
1276 ERR("Failed to notify applications or create the wait shared memory.\n"
1277 "Execution continues but there might be problem for already\n"
1278 "running applications that wishes to register.");
1282 DBG("Accepting application registration");
1284 nb_fd
= LTTNG_POLL_GETNB(&events
);
1286 /* Inifinite blocking call, waiting for transmission */
1287 ret
= lttng_poll_wait(&events
, -1);
1292 for (i
= 0; i
< nb_fd
; i
++) {
1293 /* Fetch once the poll data */
1294 revents
= LTTNG_POLL_GETEV(&events
, i
);
1295 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1297 /* Thread quit pipe has been closed. Killing thread. */
1298 ret
= check_thread_quit_pipe(pollfd
, revents
);
1303 /* Event on the registration socket */
1304 if (pollfd
== apps_sock
) {
1305 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1306 ERR("Register apps socket poll error");
1308 } else if (revents
& LPOLLIN
) {
1309 sock
= lttcomm_accept_unix_sock(apps_sock
);
1314 /* Create UST registration command for enqueuing */
1315 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1316 if (ust_cmd
== NULL
) {
1317 perror("ust command zmalloc");
1322 * Using message-based transmissions to ensure we don't
1323 * have to deal with partially received messages.
1325 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1326 sizeof(struct ust_register_msg
));
1327 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1329 perror("lttcomm_recv_unix_sock register apps");
1331 ERR("Wrong size received on apps register");
1338 ust_cmd
->sock
= sock
;
1340 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1341 " gid:%d sock:%d name:%s (version %d.%d)",
1342 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1343 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1344 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1345 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1348 * Lock free enqueue the registration request. The red pill
1349 * has been taken! This apps will be part of the *system*.
1351 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1354 * Wake the registration queue futex. Implicit memory
1355 * barrier with the exchange in cds_wfq_enqueue.
1357 futex_nto1_wake(&ust_cmd_queue
.futex
);
1364 DBG("UST Registration thread dying");
1366 /* Notify that the registration thread is gone */
1371 unlink(apps_unix_sock_path
);
1373 lttng_poll_clean(&events
);
1379 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1380 * exec or it will fails.
1382 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1385 struct timespec timeout
;
1387 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1388 timeout
.tv_nsec
= 0;
1390 /* Setup semaphore */
1391 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1393 PERROR("sem_init consumer semaphore");
1397 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1398 thread_manage_consumer
, consumer_data
);
1400 PERROR("pthread_create consumer");
1405 /* Get time for sem_timedwait absolute timeout */
1406 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1408 PERROR("clock_gettime spawn consumer");
1409 /* Infinite wait for the kconsumerd thread to be ready */
1410 ret
= sem_wait(&consumer_data
->sem
);
1412 /* Normal timeout if the gettime was successful */
1413 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1414 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1418 if (errno
== ETIMEDOUT
) {
1420 * Call has timed out so we kill the kconsumerd_thread and return
1423 ERR("The consumer thread was never ready. Killing it");
1424 ret
= pthread_cancel(consumer_data
->thread
);
1426 PERROR("pthread_cancel consumer thread");
1429 PERROR("semaphore wait failed consumer thread");
1434 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1435 if (consumer_data
->pid
== 0) {
1436 ERR("Kconsumerd did not start");
1437 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1440 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1449 * Join consumer thread
1451 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1456 if (consumer_data
->pid
!= 0) {
1457 ret
= kill(consumer_data
->pid
, SIGTERM
);
1459 ERR("Error killing consumer daemon");
1462 return pthread_join(consumer_data
->thread
, &status
);
1469 * Fork and exec a consumer daemon (consumerd).
1471 * Return pid if successful else -1.
1473 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1477 const char *consumer_to_use
;
1478 const char *verbosity
;
1481 DBG("Spawning consumerd");
1488 if (opt_verbose_consumer
) {
1489 verbosity
= "--verbose";
1491 verbosity
= "--quiet";
1493 switch (consumer_data
->type
) {
1494 case LTTNG_CONSUMER_KERNEL
:
1496 * Find out which consumerd to execute. We will first try the
1497 * 64-bit path, then the sessiond's installation directory, and
1498 * fallback on the 32-bit one,
1500 DBG3("Looking for a kernel consumer at these locations:");
1501 DBG3(" 1) %s", consumerd64_bin
);
1502 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1503 DBG3(" 3) %s", consumerd32_bin
);
1504 if (stat(consumerd64_bin
, &st
) == 0) {
1505 DBG3("Found location #1");
1506 consumer_to_use
= consumerd64_bin
;
1507 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1508 DBG3("Found location #2");
1509 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1510 } else if (stat(consumerd32_bin
, &st
) == 0) {
1511 DBG3("Found location #3");
1512 consumer_to_use
= consumerd32_bin
;
1514 DBG("Could not find any valid consumerd executable");
1517 DBG("Using kernel consumer at: %s", consumer_to_use
);
1518 execl(consumer_to_use
,
1519 "lttng-consumerd", verbosity
, "-k",
1520 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1521 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1524 case LTTNG_CONSUMER64_UST
:
1526 char *tmpnew
= NULL
;
1528 if (consumerd64_libdir
[0] != '\0') {
1532 tmp
= getenv("LD_LIBRARY_PATH");
1536 tmplen
= strlen("LD_LIBRARY_PATH=")
1537 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1538 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1543 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1544 strcat(tmpnew
, consumerd64_libdir
);
1545 if (tmp
[0] != '\0') {
1546 strcat(tmpnew
, ":");
1547 strcat(tmpnew
, tmp
);
1549 ret
= putenv(tmpnew
);
1555 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1556 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1557 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1558 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1560 if (consumerd64_libdir
[0] != '\0') {
1568 case LTTNG_CONSUMER32_UST
:
1570 char *tmpnew
= NULL
;
1572 if (consumerd32_libdir
[0] != '\0') {
1576 tmp
= getenv("LD_LIBRARY_PATH");
1580 tmplen
= strlen("LD_LIBRARY_PATH=")
1581 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1582 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1587 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1588 strcat(tmpnew
, consumerd32_libdir
);
1589 if (tmp
[0] != '\0') {
1590 strcat(tmpnew
, ":");
1591 strcat(tmpnew
, tmp
);
1593 ret
= putenv(tmpnew
);
1599 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1600 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1601 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1602 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1604 if (consumerd32_libdir
[0] != '\0') {
1613 perror("unknown consumer type");
1617 perror("kernel start consumer exec");
1620 } else if (pid
> 0) {
1623 perror("start consumer fork");
1631 * Spawn the consumerd daemon and session daemon thread.
1633 static int start_consumerd(struct consumer_data
*consumer_data
)
1637 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1638 if (consumer_data
->pid
!= 0) {
1639 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1643 ret
= spawn_consumerd(consumer_data
);
1645 ERR("Spawning consumerd failed");
1646 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1650 /* Setting up the consumer_data pid */
1651 consumer_data
->pid
= ret
;
1652 DBG2("Consumer pid %d", consumer_data
->pid
);
1653 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1655 DBG2("Spawning consumer control thread");
1656 ret
= spawn_consumer_thread(consumer_data
);
1658 ERR("Fatal error spawning consumer control thread");
1670 * Check version of the lttng-modules.
1672 static int validate_lttng_modules_version(void)
1674 return kernel_validate_version(kernel_tracer_fd
);
1678 * Setup necessary data for kernel tracer action.
1680 static int init_kernel_tracer(void)
1684 /* Modprobe lttng kernel modules */
1685 ret
= modprobe_lttng_control();
1690 /* Open debugfs lttng */
1691 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1692 if (kernel_tracer_fd
< 0) {
1693 DBG("Failed to open %s", module_proc_lttng
);
1698 /* Validate kernel version */
1699 ret
= validate_lttng_modules_version();
1704 ret
= modprobe_lttng_data();
1709 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1713 modprobe_remove_lttng_control();
1714 close(kernel_tracer_fd
);
1715 kernel_tracer_fd
= 0;
1716 return LTTCOMM_KERN_VERSION
;
1719 close(kernel_tracer_fd
);
1722 modprobe_remove_lttng_control();
1725 WARN("No kernel tracer available");
1726 kernel_tracer_fd
= 0;
1727 return LTTCOMM_KERN_NA
;
1731 * Init tracing by creating trace directory and sending fds kernel consumer.
1733 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1737 if (session
->consumer_fds_sent
== 0) {
1739 * Assign default kernel consumer socket if no consumer assigned to the
1740 * kernel session. At this point, it's NOT suppose to be 0 but this is
1741 * an extra security check.
1743 if (session
->consumer_fd
== 0) {
1744 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1747 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1749 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1753 session
->consumer_fds_sent
= 1;
1761 * Create an UST session and add it to the session ust list.
1763 static int create_ust_session(struct ltt_session
*session
,
1764 struct lttng_domain
*domain
)
1766 struct ltt_ust_session
*lus
= NULL
;
1769 switch (domain
->type
) {
1770 case LTTNG_DOMAIN_UST
:
1773 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1777 DBG("Creating UST session");
1779 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1781 ret
= LTTCOMM_UST_SESS_FAIL
;
1785 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1786 session
->uid
, session
->gid
);
1788 if (ret
!= -EEXIST
) {
1789 ERR("Trace directory creation error");
1790 ret
= LTTCOMM_UST_SESS_FAIL
;
1795 /* The domain type dictate different actions on session creation */
1796 switch (domain
->type
) {
1797 case LTTNG_DOMAIN_UST
:
1798 /* No ustctl for the global UST domain */
1801 ERR("Unknown UST domain on create session %d", domain
->type
);
1804 lus
->uid
= session
->uid
;
1805 lus
->gid
= session
->gid
;
1806 session
->ust_session
= lus
;
1816 * Create a kernel tracer session then create the default channel.
1818 static int create_kernel_session(struct ltt_session
*session
)
1822 DBG("Creating kernel session");
1824 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1826 ret
= LTTCOMM_KERN_SESS_FAIL
;
1830 /* Set kernel consumer socket fd */
1831 if (kconsumer_data
.cmd_sock
) {
1832 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1835 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
1836 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
1838 if (ret
!= -EEXIST
) {
1839 ERR("Trace directory creation error");
1843 session
->kernel_session
->uid
= session
->uid
;
1844 session
->kernel_session
->gid
= session
->gid
;
1851 * Check if the UID or GID match the session. Root user has access to all
1854 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
1856 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
1863 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
1866 struct ltt_session
*session
;
1868 DBG("Counting number of available session for UID %d GID %d",
1870 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1872 * Only list the sessions the user can control.
1874 if (!session_access_ok(session
, uid
, gid
)) {
1883 * Using the session list, filled a lttng_session array to send back to the
1884 * client for session listing.
1886 * The session list lock MUST be acquired before calling this function. Use
1887 * session_lock_list() and session_unlock_list().
1889 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
1893 struct ltt_session
*session
;
1895 DBG("Getting all available session for UID %d GID %d",
1898 * Iterate over session list and append data after the control struct in
1901 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1903 * Only list the sessions the user can control.
1905 if (!session_access_ok(session
, uid
, gid
)) {
1908 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1909 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1910 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1911 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1912 sessions
[i
].enabled
= session
->enabled
;
1918 * Fill lttng_channel array of all channels.
1920 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1921 struct lttng_channel
*channels
)
1924 struct ltt_kernel_channel
*kchan
;
1926 DBG("Listing channels for session %s", session
->name
);
1929 case LTTNG_DOMAIN_KERNEL
:
1930 /* Kernel channels */
1931 if (session
->kernel_session
!= NULL
) {
1932 cds_list_for_each_entry(kchan
,
1933 &session
->kernel_session
->channel_list
.head
, list
) {
1934 /* Copy lttng_channel struct to array */
1935 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1936 channels
[i
].enabled
= kchan
->enabled
;
1941 case LTTNG_DOMAIN_UST
:
1943 struct lttng_ht_iter iter
;
1944 struct ltt_ust_channel
*uchan
;
1946 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
1947 &iter
.iter
, uchan
, node
.node
) {
1948 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1949 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1950 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1951 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1952 channels
[i
].attr
.switch_timer_interval
=
1953 uchan
->attr
.switch_timer_interval
;
1954 channels
[i
].attr
.read_timer_interval
=
1955 uchan
->attr
.read_timer_interval
;
1956 channels
[i
].enabled
= uchan
->enabled
;
1957 switch (uchan
->attr
.output
) {
1958 case LTTNG_UST_MMAP
:
1960 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
1973 * Create a list of ust global domain events.
1975 static int list_lttng_ust_global_events(char *channel_name
,
1976 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1979 unsigned int nb_event
= 0;
1980 struct lttng_ht_iter iter
;
1981 struct lttng_ht_node_str
*node
;
1982 struct ltt_ust_channel
*uchan
;
1983 struct ltt_ust_event
*uevent
;
1984 struct lttng_event
*tmp
;
1986 DBG("Listing UST global events for channel %s", channel_name
);
1990 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
1991 node
= lttng_ht_iter_get_node_str(&iter
);
1993 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
1997 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
1999 nb_event
+= lttng_ht_get_count(uchan
->events
);
2001 if (nb_event
== 0) {
2006 DBG3("Listing UST global %d events", nb_event
);
2008 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2010 ret
= -LTTCOMM_FATAL
;
2014 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2015 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2016 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2017 tmp
[i
].enabled
= uevent
->enabled
;
2018 switch (uevent
->attr
.instrumentation
) {
2019 case LTTNG_UST_TRACEPOINT
:
2020 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2022 case LTTNG_UST_PROBE
:
2023 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2025 case LTTNG_UST_FUNCTION
:
2026 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2028 case LTTNG_UST_TRACEPOINT_LOGLEVEL
:
2029 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT_LOGLEVEL
;
2044 * Fill lttng_event array of all kernel events in the channel.
2046 static int list_lttng_kernel_events(char *channel_name
,
2047 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2050 unsigned int nb_event
;
2051 struct ltt_kernel_event
*event
;
2052 struct ltt_kernel_channel
*kchan
;
2054 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2055 if (kchan
== NULL
) {
2056 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2060 nb_event
= kchan
->event_count
;
2062 DBG("Listing events for channel %s", kchan
->channel
->name
);
2064 if (nb_event
== 0) {
2069 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2070 if (*events
== NULL
) {
2071 ret
= LTTCOMM_FATAL
;
2075 /* Kernel channels */
2076 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2077 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2078 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2079 (*events
)[i
].enabled
= event
->enabled
;
2080 switch (event
->event
->instrumentation
) {
2081 case LTTNG_KERNEL_TRACEPOINT
:
2082 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2084 case LTTNG_KERNEL_KPROBE
:
2085 case LTTNG_KERNEL_KRETPROBE
:
2086 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2087 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2088 sizeof(struct lttng_kernel_kprobe
));
2090 case LTTNG_KERNEL_FUNCTION
:
2091 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2092 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2093 sizeof(struct lttng_kernel_function
));
2095 case LTTNG_KERNEL_NOOP
:
2096 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2098 case LTTNG_KERNEL_SYSCALL
:
2099 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2101 case LTTNG_KERNEL_ALL
:
2115 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2117 static int cmd_disable_channel(struct ltt_session
*session
,
2118 int domain
, char *channel_name
)
2121 struct ltt_ust_session
*usess
;
2123 usess
= session
->ust_session
;
2126 case LTTNG_DOMAIN_KERNEL
:
2128 ret
= channel_kernel_disable(session
->kernel_session
,
2130 if (ret
!= LTTCOMM_OK
) {
2134 kernel_wait_quiescent(kernel_tracer_fd
);
2137 case LTTNG_DOMAIN_UST
:
2139 struct ltt_ust_channel
*uchan
;
2140 struct lttng_ht
*chan_ht
;
2142 chan_ht
= usess
->domain_global
.channels
;
2144 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2145 if (uchan
== NULL
) {
2146 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2150 ret
= channel_ust_disable(usess
, domain
, uchan
);
2151 if (ret
!= LTTCOMM_OK
) {
2156 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2157 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2158 case LTTNG_DOMAIN_UST_PID
:
2159 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2162 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2173 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2175 static int cmd_enable_channel(struct ltt_session
*session
,
2176 int domain
, struct lttng_channel
*attr
)
2179 struct ltt_ust_session
*usess
= session
->ust_session
;
2180 struct lttng_ht
*chan_ht
;
2182 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2185 case LTTNG_DOMAIN_KERNEL
:
2187 struct ltt_kernel_channel
*kchan
;
2189 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2190 session
->kernel_session
);
2191 if (kchan
== NULL
) {
2192 ret
= channel_kernel_create(session
->kernel_session
,
2193 attr
, kernel_poll_pipe
[1]);
2195 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2198 if (ret
!= LTTCOMM_OK
) {
2202 kernel_wait_quiescent(kernel_tracer_fd
);
2205 case LTTNG_DOMAIN_UST
:
2207 struct ltt_ust_channel
*uchan
;
2209 chan_ht
= usess
->domain_global
.channels
;
2211 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2212 if (uchan
== NULL
) {
2213 ret
= channel_ust_create(usess
, domain
, attr
);
2215 ret
= channel_ust_enable(usess
, domain
, uchan
);
2219 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2220 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2221 case LTTNG_DOMAIN_UST_PID
:
2222 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2225 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2234 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2236 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2237 char *channel_name
, char *event_name
)
2242 case LTTNG_DOMAIN_KERNEL
:
2244 struct ltt_kernel_channel
*kchan
;
2245 struct ltt_kernel_session
*ksess
;
2247 ksess
= session
->kernel_session
;
2249 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2250 if (kchan
== NULL
) {
2251 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2255 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2256 if (ret
!= LTTCOMM_OK
) {
2260 kernel_wait_quiescent(kernel_tracer_fd
);
2263 case LTTNG_DOMAIN_UST
:
2265 struct ltt_ust_channel
*uchan
;
2266 struct ltt_ust_session
*usess
;
2268 usess
= session
->ust_session
;
2270 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2272 if (uchan
== NULL
) {
2273 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2277 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2278 if (ret
!= LTTCOMM_OK
) {
2282 DBG3("Disable UST event %s in channel %s completed", event_name
,
2286 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2287 case LTTNG_DOMAIN_UST_PID
:
2288 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2290 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2301 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2303 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2309 case LTTNG_DOMAIN_KERNEL
:
2311 struct ltt_kernel_session
*ksess
;
2312 struct ltt_kernel_channel
*kchan
;
2314 ksess
= session
->kernel_session
;
2316 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2317 if (kchan
== NULL
) {
2318 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2322 ret
= event_kernel_disable_all(ksess
, kchan
);
2323 if (ret
!= LTTCOMM_OK
) {
2327 kernel_wait_quiescent(kernel_tracer_fd
);
2330 case LTTNG_DOMAIN_UST
:
2332 struct ltt_ust_session
*usess
;
2333 struct ltt_ust_channel
*uchan
;
2335 usess
= session
->ust_session
;
2337 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2339 if (uchan
== NULL
) {
2340 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2344 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2349 DBG3("Disable all UST events in channel %s completed", channel_name
);
2353 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2354 case LTTNG_DOMAIN_UST_PID
:
2355 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2357 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2368 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2370 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2371 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2376 case LTTNG_DOMAIN_KERNEL
:
2377 /* Add kernel context to kernel tracer */
2378 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2379 event_name
, channel_name
);
2380 if (ret
!= LTTCOMM_OK
) {
2384 case LTTNG_DOMAIN_UST
:
2386 struct ltt_ust_session
*usess
= session
->ust_session
;
2388 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2389 if (ret
!= LTTCOMM_OK
) {
2394 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2395 case LTTNG_DOMAIN_UST_PID
:
2396 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2398 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2409 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2411 * TODO: currently, both events and loglevels are kept within the same
2412 * namespace for UST global registry/app registery, so if an event
2413 * happen to have the same name as the loglevel (very unlikely though),
2414 * and an attempt is made to enable/disable both in the same session,
2415 * the first to be created will be the only one allowed to exist.
2417 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2418 char *channel_name
, struct lttng_event
*event
)
2421 struct lttng_channel
*attr
;
2422 struct ltt_ust_session
*usess
= session
->ust_session
;
2425 case LTTNG_DOMAIN_KERNEL
:
2427 struct ltt_kernel_channel
*kchan
;
2429 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2430 session
->kernel_session
);
2431 if (kchan
== NULL
) {
2432 attr
= channel_new_default_attr(domain
);
2434 ret
= LTTCOMM_FATAL
;
2437 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2439 /* This call will notify the kernel thread */
2440 ret
= channel_kernel_create(session
->kernel_session
,
2441 attr
, kernel_poll_pipe
[1]);
2442 if (ret
!= LTTCOMM_OK
) {
2449 /* Get the newly created kernel channel pointer */
2450 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2451 session
->kernel_session
);
2452 if (kchan
== NULL
) {
2453 /* This sould not happen... */
2454 ret
= LTTCOMM_FATAL
;
2458 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2460 if (ret
!= LTTCOMM_OK
) {
2464 kernel_wait_quiescent(kernel_tracer_fd
);
2467 case LTTNG_DOMAIN_UST
:
2469 struct lttng_channel
*attr
;
2470 struct ltt_ust_channel
*uchan
;
2472 /* Get channel from global UST domain */
2473 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2475 if (uchan
== NULL
) {
2476 /* Create default channel */
2477 attr
= channel_new_default_attr(domain
);
2479 ret
= LTTCOMM_FATAL
;
2482 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2483 attr
->name
[NAME_MAX
- 1] = '\0';
2485 ret
= channel_ust_create(usess
, domain
, attr
);
2486 if (ret
!= LTTCOMM_OK
) {
2492 /* Get the newly created channel reference back */
2493 uchan
= trace_ust_find_channel_by_name(
2494 usess
->domain_global
.channels
, channel_name
);
2495 if (uchan
== NULL
) {
2496 /* Something is really wrong */
2497 ret
= LTTCOMM_FATAL
;
2502 /* At this point, the session and channel exist on the tracer */
2503 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2504 if (ret
!= LTTCOMM_OK
) {
2509 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2510 case LTTNG_DOMAIN_UST_PID
:
2511 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2513 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2524 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2526 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2527 char *channel_name
, int event_type
)
2530 struct ltt_kernel_channel
*kchan
;
2533 case LTTNG_DOMAIN_KERNEL
:
2534 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2535 session
->kernel_session
);
2536 if (kchan
== NULL
) {
2537 /* This call will notify the kernel thread */
2538 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2539 kernel_poll_pipe
[1]);
2540 if (ret
!= LTTCOMM_OK
) {
2544 /* Get the newly created kernel channel pointer */
2545 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2546 session
->kernel_session
);
2547 if (kchan
== NULL
) {
2548 /* This sould not happen... */
2549 ret
= LTTCOMM_FATAL
;
2555 switch (event_type
) {
2556 case LTTNG_EVENT_SYSCALL
:
2557 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2558 kchan
, kernel_tracer_fd
);
2560 case LTTNG_EVENT_TRACEPOINT
:
2562 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2563 * events already registered to the channel.
2565 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2566 kchan
, kernel_tracer_fd
);
2568 case LTTNG_EVENT_ALL
:
2569 /* Enable syscalls and tracepoints */
2570 ret
= event_kernel_enable_all(session
->kernel_session
,
2571 kchan
, kernel_tracer_fd
);
2574 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2578 /* Manage return value */
2579 if (ret
!= LTTCOMM_OK
) {
2583 kernel_wait_quiescent(kernel_tracer_fd
);
2585 case LTTNG_DOMAIN_UST
:
2587 struct lttng_channel
*attr
;
2588 struct ltt_ust_channel
*uchan
;
2589 struct ltt_ust_session
*usess
= session
->ust_session
;
2591 /* Get channel from global UST domain */
2592 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2594 if (uchan
== NULL
) {
2595 /* Create default channel */
2596 attr
= channel_new_default_attr(domain
);
2598 ret
= LTTCOMM_FATAL
;
2601 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2602 attr
->name
[NAME_MAX
- 1] = '\0';
2604 /* Use the internal command enable channel */
2605 ret
= channel_ust_create(usess
, domain
, attr
);
2606 if (ret
!= LTTCOMM_OK
) {
2612 /* Get the newly created channel reference back */
2613 uchan
= trace_ust_find_channel_by_name(
2614 usess
->domain_global
.channels
, channel_name
);
2615 if (uchan
== NULL
) {
2616 /* Something is really wrong */
2617 ret
= LTTCOMM_FATAL
;
2622 /* At this point, the session and channel exist on the tracer */
2624 switch (event_type
) {
2625 case LTTNG_EVENT_ALL
:
2626 case LTTNG_EVENT_TRACEPOINT
:
2627 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2628 if (ret
!= LTTCOMM_OK
) {
2633 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2637 /* Manage return value */
2638 if (ret
!= LTTCOMM_OK
) {
2644 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2645 case LTTNG_DOMAIN_UST_PID
:
2646 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2648 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2659 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2661 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2664 ssize_t nb_events
= 0;
2667 case LTTNG_DOMAIN_KERNEL
:
2668 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2669 if (nb_events
< 0) {
2670 ret
= LTTCOMM_KERN_LIST_FAIL
;
2674 case LTTNG_DOMAIN_UST
:
2675 nb_events
= ust_app_list_events(events
);
2676 if (nb_events
< 0) {
2677 ret
= LTTCOMM_UST_LIST_FAIL
;
2682 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2689 /* Return negative value to differentiate return code */
2694 * Command LTTNG_START_TRACE processed by the client thread.
2696 static int cmd_start_trace(struct ltt_session
*session
)
2699 struct ltt_kernel_session
*ksession
;
2700 struct ltt_ust_session
*usess
;
2703 ksession
= session
->kernel_session
;
2704 usess
= session
->ust_session
;
2706 if (session
->enabled
) {
2707 ret
= LTTCOMM_UST_START_FAIL
;
2711 session
->enabled
= 1;
2713 /* Kernel tracing */
2714 if (ksession
!= NULL
) {
2715 struct ltt_kernel_channel
*kchan
;
2717 /* Open kernel metadata */
2718 if (ksession
->metadata
== NULL
) {
2719 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2721 ret
= LTTCOMM_KERN_META_FAIL
;
2726 /* Open kernel metadata stream */
2727 if (ksession
->metadata_stream_fd
== 0) {
2728 ret
= kernel_open_metadata_stream(ksession
);
2730 ERR("Kernel create metadata stream failed");
2731 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2736 /* For each channel */
2737 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2738 if (kchan
->stream_count
== 0) {
2739 ret
= kernel_open_channel_stream(kchan
);
2741 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2744 /* Update the stream global counter */
2745 ksession
->stream_count_global
+= ret
;
2749 /* Setup kernel consumer socket and send fds to it */
2750 ret
= init_kernel_tracing(ksession
);
2752 ret
= LTTCOMM_KERN_START_FAIL
;
2756 /* This start the kernel tracing */
2757 ret
= kernel_start_session(ksession
);
2759 ret
= LTTCOMM_KERN_START_FAIL
;
2763 /* Quiescent wait after starting trace */
2764 kernel_wait_quiescent(kernel_tracer_fd
);
2767 /* Flag session that trace should start automatically */
2769 usess
->start_trace
= 1;
2771 ret
= ust_app_start_trace_all(usess
);
2773 ret
= LTTCOMM_UST_START_FAIL
;
2785 * Command LTTNG_STOP_TRACE processed by the client thread.
2787 static int cmd_stop_trace(struct ltt_session
*session
)
2790 struct ltt_kernel_channel
*kchan
;
2791 struct ltt_kernel_session
*ksession
;
2792 struct ltt_ust_session
*usess
;
2795 ksession
= session
->kernel_session
;
2796 usess
= session
->ust_session
;
2798 if (!session
->enabled
) {
2799 ret
= LTTCOMM_UST_STOP_FAIL
;
2803 session
->enabled
= 0;
2806 if (ksession
!= NULL
) {
2807 DBG("Stop kernel tracing");
2809 /* Flush all buffers before stopping */
2810 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2812 ERR("Kernel metadata flush failed");
2815 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2816 ret
= kernel_flush_buffer(kchan
);
2818 ERR("Kernel flush buffer error");
2822 ret
= kernel_stop_session(ksession
);
2824 ret
= LTTCOMM_KERN_STOP_FAIL
;
2828 kernel_wait_quiescent(kernel_tracer_fd
);
2832 usess
->start_trace
= 0;
2834 ret
= ust_app_stop_trace_all(usess
);
2836 ret
= LTTCOMM_UST_STOP_FAIL
;
2848 * Command LTTNG_CREATE_SESSION processed by the client thread.
2850 static int cmd_create_session(char *name
, char *path
, struct ucred
*creds
)
2854 ret
= session_create(name
, path
, creds
->uid
, creds
->gid
);
2855 if (ret
!= LTTCOMM_OK
) {
2866 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2868 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2872 /* Clean kernel session teardown */
2873 teardown_kernel_session(session
);
2874 /* UST session teardown */
2875 teardown_ust_session(session
);
2878 * Must notify the kernel thread here to update it's poll setin order
2879 * to remove the channel(s)' fd just destroyed.
2881 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2883 perror("write kernel poll pipe");
2886 ret
= session_destroy(session
);
2892 * Command LTTNG_CALIBRATE processed by the client thread.
2894 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2899 case LTTNG_DOMAIN_KERNEL
:
2901 struct lttng_kernel_calibrate kcalibrate
;
2903 kcalibrate
.type
= calibrate
->type
;
2904 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2906 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2912 /* TODO: Userspace tracing */
2913 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2924 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2926 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2932 case LTTNG_DOMAIN_KERNEL
:
2933 /* Can't register a consumer if there is already one */
2934 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
2935 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2939 sock
= lttcomm_connect_unix_sock(sock_path
);
2941 ret
= LTTCOMM_CONNECT_FAIL
;
2945 session
->kernel_session
->consumer_fd
= sock
;
2948 /* TODO: Userspace tracing */
2949 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2960 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2962 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2963 struct lttng_domain
**domains
)
2968 if (session
->kernel_session
!= NULL
) {
2969 DBG3("Listing domains found kernel domain");
2973 if (session
->ust_session
!= NULL
) {
2974 DBG3("Listing domains found UST global domain");
2978 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2979 if (*domains
== NULL
) {
2980 ret
= -LTTCOMM_FATAL
;
2984 if (session
->kernel_session
!= NULL
) {
2985 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2989 if (session
->ust_session
!= NULL
) {
2990 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3001 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3003 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3004 struct lttng_channel
**channels
)
3007 ssize_t nb_chan
= 0;
3010 case LTTNG_DOMAIN_KERNEL
:
3011 if (session
->kernel_session
!= NULL
) {
3012 nb_chan
= session
->kernel_session
->channel_count
;
3014 DBG3("Number of kernel channels %zd", nb_chan
);
3016 case LTTNG_DOMAIN_UST
:
3017 if (session
->ust_session
!= NULL
) {
3018 nb_chan
= lttng_ht_get_count(
3019 session
->ust_session
->domain_global
.channels
);
3021 DBG3("Number of UST global channels %zd", nb_chan
);
3025 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3030 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3031 if (*channels
== NULL
) {
3032 ret
= -LTTCOMM_FATAL
;
3036 list_lttng_channels(domain
, session
, *channels
);
3048 * Command LTTNG_LIST_EVENTS processed by the client thread.
3050 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3051 char *channel_name
, struct lttng_event
**events
)
3054 ssize_t nb_event
= 0;
3057 case LTTNG_DOMAIN_KERNEL
:
3058 if (session
->kernel_session
!= NULL
) {
3059 nb_event
= list_lttng_kernel_events(channel_name
,
3060 session
->kernel_session
, events
);
3063 case LTTNG_DOMAIN_UST
:
3065 if (session
->ust_session
!= NULL
) {
3066 nb_event
= list_lttng_ust_global_events(channel_name
,
3067 &session
->ust_session
->domain_global
, events
);
3072 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3083 * Process the command requested by the lttng client within the command
3084 * context structure. This function make sure that the return structure (llm)
3085 * is set and ready for transmission before returning.
3087 * Return any error encountered or 0 for success.
3089 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3091 int ret
= LTTCOMM_OK
;
3092 int need_tracing_session
= 1;
3094 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3096 if (opt_no_kernel
&& cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3097 ret
= LTTCOMM_KERN_NA
;
3102 * Check for command that don't needs to allocate a returned payload. We do
3103 * this here so we don't have to make the call for no payload at each
3106 switch(cmd_ctx
->lsm
->cmd_type
) {
3107 case LTTNG_LIST_SESSIONS
:
3108 case LTTNG_LIST_TRACEPOINTS
:
3109 case LTTNG_LIST_DOMAINS
:
3110 case LTTNG_LIST_CHANNELS
:
3111 case LTTNG_LIST_EVENTS
:
3114 /* Setup lttng message with no payload */
3115 ret
= setup_lttng_msg(cmd_ctx
, 0);
3117 /* This label does not try to unlock the session */
3118 goto init_setup_error
;
3122 /* Commands that DO NOT need a session. */
3123 switch (cmd_ctx
->lsm
->cmd_type
) {
3124 case LTTNG_CALIBRATE
:
3125 case LTTNG_CREATE_SESSION
:
3126 case LTTNG_LIST_SESSIONS
:
3127 case LTTNG_LIST_TRACEPOINTS
:
3128 need_tracing_session
= 0;
3131 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3132 session_lock_list();
3133 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3134 session_unlock_list();
3135 if (cmd_ctx
->session
== NULL
) {
3136 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3137 ret
= LTTCOMM_SESS_NOT_FOUND
;
3139 /* If no session name specified */
3140 ret
= LTTCOMM_SELECT_SESS
;
3144 /* Acquire lock for the session */
3145 session_lock(cmd_ctx
->session
);
3151 * Check domain type for specific "pre-action".
3153 switch (cmd_ctx
->lsm
->domain
.type
) {
3154 case LTTNG_DOMAIN_KERNEL
:
3156 ret
= LTTCOMM_KERN_NA
;
3160 /* Kernel tracer check */
3161 if (kernel_tracer_fd
== 0) {
3162 /* Basically, load kernel tracer modules */
3163 ret
= init_kernel_tracer();
3169 /* Need a session for kernel command */
3170 if (need_tracing_session
) {
3171 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3172 ret
= create_kernel_session(cmd_ctx
->session
);
3174 ret
= LTTCOMM_KERN_SESS_FAIL
;
3179 /* Start the kernel consumer daemon */
3180 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3181 if (kconsumer_data
.pid
== 0 &&
3182 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3183 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3184 ret
= start_consumerd(&kconsumer_data
);
3186 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3190 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3194 case LTTNG_DOMAIN_UST
:
3196 if (need_tracing_session
) {
3197 if (cmd_ctx
->session
->ust_session
== NULL
) {
3198 ret
= create_ust_session(cmd_ctx
->session
,
3199 &cmd_ctx
->lsm
->domain
);
3200 if (ret
!= LTTCOMM_OK
) {
3204 /* Start the UST consumer daemons */
3206 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3207 if (consumerd64_bin
[0] != '\0' &&
3208 ustconsumer64_data
.pid
== 0 &&
3209 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3210 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3211 ret
= start_consumerd(&ustconsumer64_data
);
3213 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3214 ust_consumerd64_fd
= -EINVAL
;
3218 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3220 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3223 if (consumerd32_bin
[0] != '\0' &&
3224 ustconsumer32_data
.pid
== 0 &&
3225 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3226 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3227 ret
= start_consumerd(&ustconsumer32_data
);
3229 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3230 ust_consumerd32_fd
= -EINVAL
;
3233 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3235 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3245 * Check that the UID or GID match that of the tracing session.
3246 * The root user can interact with all sessions.
3248 if (need_tracing_session
) {
3249 if (!session_access_ok(cmd_ctx
->session
,
3250 cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
)) {
3251 ret
= LTTCOMM_EPERM
;
3256 /* Process by command type */
3257 switch (cmd_ctx
->lsm
->cmd_type
) {
3258 case LTTNG_ADD_CONTEXT
:
3260 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3261 cmd_ctx
->lsm
->u
.context
.channel_name
,
3262 cmd_ctx
->lsm
->u
.context
.event_name
,
3263 &cmd_ctx
->lsm
->u
.context
.ctx
);
3266 case LTTNG_DISABLE_CHANNEL
:
3268 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3269 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3272 case LTTNG_DISABLE_EVENT
:
3274 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3275 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3276 cmd_ctx
->lsm
->u
.disable
.name
);
3280 case LTTNG_DISABLE_ALL_EVENT
:
3282 DBG("Disabling all events");
3284 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3285 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3288 case LTTNG_ENABLE_CHANNEL
:
3290 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3291 &cmd_ctx
->lsm
->u
.channel
.chan
);
3294 case LTTNG_ENABLE_EVENT
:
3296 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3297 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3298 &cmd_ctx
->lsm
->u
.enable
.event
);
3301 case LTTNG_ENABLE_ALL_EVENT
:
3303 DBG("Enabling all events");
3305 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3306 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3307 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3310 case LTTNG_LIST_TRACEPOINTS
:
3312 struct lttng_event
*events
;
3315 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3316 if (nb_events
< 0) {
3322 * Setup lttng message with payload size set to the event list size in
3323 * bytes and then copy list into the llm payload.
3325 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3331 /* Copy event list into message payload */
3332 memcpy(cmd_ctx
->llm
->payload
, events
,
3333 sizeof(struct lttng_event
) * nb_events
);
3340 case LTTNG_START_TRACE
:
3342 ret
= cmd_start_trace(cmd_ctx
->session
);
3345 case LTTNG_STOP_TRACE
:
3347 ret
= cmd_stop_trace(cmd_ctx
->session
);
3350 case LTTNG_CREATE_SESSION
:
3352 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3353 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3356 case LTTNG_DESTROY_SESSION
:
3358 ret
= cmd_destroy_session(cmd_ctx
->session
,
3359 cmd_ctx
->lsm
->session
.name
);
3362 case LTTNG_LIST_DOMAINS
:
3365 struct lttng_domain
*domains
;
3367 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3373 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3378 /* Copy event list into message payload */
3379 memcpy(cmd_ctx
->llm
->payload
, domains
,
3380 nb_dom
* sizeof(struct lttng_domain
));
3387 case LTTNG_LIST_CHANNELS
:
3390 struct lttng_channel
*channels
;
3392 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3393 cmd_ctx
->session
, &channels
);
3399 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3404 /* Copy event list into message payload */
3405 memcpy(cmd_ctx
->llm
->payload
, channels
,
3406 nb_chan
* sizeof(struct lttng_channel
));
3413 case LTTNG_LIST_EVENTS
:
3416 struct lttng_event
*events
= NULL
;
3418 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3419 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3425 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3430 /* Copy event list into message payload */
3431 memcpy(cmd_ctx
->llm
->payload
, events
,
3432 nb_event
* sizeof(struct lttng_event
));
3439 case LTTNG_LIST_SESSIONS
:
3441 unsigned int nr_sessions
;
3443 session_lock_list();
3444 nr_sessions
= lttng_sessions_count(cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
);
3445 if (nr_sessions
== 0) {
3446 ret
= LTTCOMM_NO_SESSION
;
3447 session_unlock_list();
3450 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3452 session_unlock_list();
3456 /* Filled the session array */
3457 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3458 cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
);
3460 session_unlock_list();
3465 case LTTNG_CALIBRATE
:
3467 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3468 &cmd_ctx
->lsm
->u
.calibrate
);
3471 case LTTNG_REGISTER_CONSUMER
:
3473 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3474 cmd_ctx
->lsm
->u
.reg
.path
);
3483 if (cmd_ctx
->llm
== NULL
) {
3484 DBG("Missing llm structure. Allocating one.");
3485 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3489 /* Set return code */
3490 cmd_ctx
->llm
->ret_code
= ret
;
3492 if (cmd_ctx
->session
) {
3493 session_unlock(cmd_ctx
->session
);
3500 * This thread manage all clients request using the unix client socket for
3503 static void *thread_manage_clients(void *data
)
3505 int sock
= 0, ret
, i
, pollfd
;
3506 uint32_t revents
, nb_fd
;
3507 struct command_ctx
*cmd_ctx
= NULL
;
3508 struct lttng_poll_event events
;
3510 DBG("[thread] Manage client started");
3512 rcu_register_thread();
3514 ret
= lttcomm_listen_unix_sock(client_sock
);
3520 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3521 * more will be added to this poll set.
3523 ret
= create_thread_poll_set(&events
, 2);
3528 /* Add the application registration socket */
3529 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3535 * Notify parent pid that we are ready to accept command for client side.
3537 if (opt_sig_parent
) {
3538 kill(ppid
, SIGCHLD
);
3542 DBG("Accepting client command ...");
3544 nb_fd
= LTTNG_POLL_GETNB(&events
);
3546 /* Inifinite blocking call, waiting for transmission */
3547 ret
= lttng_poll_wait(&events
, -1);
3552 for (i
= 0; i
< nb_fd
; i
++) {
3553 /* Fetch once the poll data */
3554 revents
= LTTNG_POLL_GETEV(&events
, i
);
3555 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3557 /* Thread quit pipe has been closed. Killing thread. */
3558 ret
= check_thread_quit_pipe(pollfd
, revents
);
3563 /* Event on the registration socket */
3564 if (pollfd
== client_sock
) {
3565 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3566 ERR("Client socket poll error");
3572 DBG("Wait for client response");
3574 sock
= lttcomm_accept_unix_sock(client_sock
);
3579 /* Set socket option for credentials retrieval */
3580 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3585 /* Allocate context command to process the client request */
3586 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3587 if (cmd_ctx
== NULL
) {
3588 perror("zmalloc cmd_ctx");
3592 /* Allocate data buffer for reception */
3593 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3594 if (cmd_ctx
->lsm
== NULL
) {
3595 perror("zmalloc cmd_ctx->lsm");
3599 cmd_ctx
->llm
= NULL
;
3600 cmd_ctx
->session
= NULL
;
3603 * Data is received from the lttng client. The struct
3604 * lttcomm_session_msg (lsm) contains the command and data request of
3607 DBG("Receiving data from client ...");
3608 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3609 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3611 DBG("Nothing recv() from client... continuing");
3617 // TODO: Validate cmd_ctx including sanity check for
3618 // security purpose.
3620 rcu_thread_online();
3622 * This function dispatch the work to the kernel or userspace tracer
3623 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3624 * informations for the client. The command context struct contains
3625 * everything this function may needs.
3627 ret
= process_client_msg(cmd_ctx
);
3628 rcu_thread_offline();
3631 * TODO: Inform client somehow of the fatal error. At
3632 * this point, ret < 0 means that a zmalloc failed
3633 * (ENOMEM). Error detected but still accept command.
3635 clean_command_ctx(&cmd_ctx
);
3639 DBG("Sending response (size: %d, retcode: %s)",
3640 cmd_ctx
->lttng_msg_size
,
3641 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3642 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3644 ERR("Failed to send data back to client");
3647 /* End of transmission */
3650 clean_command_ctx(&cmd_ctx
);
3654 DBG("Client thread dying");
3655 unlink(client_unix_sock_path
);
3659 lttng_poll_clean(&events
);
3660 clean_command_ctx(&cmd_ctx
);
3662 rcu_unregister_thread();
3668 * usage function on stderr
3670 static void usage(void)
3672 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3673 fprintf(stderr
, " -h, --help Display this usage.\n");
3674 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3675 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3676 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3677 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3678 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3679 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3680 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3681 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3682 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3683 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3684 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3685 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3686 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3687 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3688 fprintf(stderr
, " -V, --version Show version number.\n");
3689 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3690 fprintf(stderr
, " -q, --quiet No output at all.\n");
3691 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3692 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3693 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3697 * daemon argument parsing
3699 static int parse_args(int argc
, char **argv
)
3703 static struct option long_options
[] = {
3704 { "client-sock", 1, 0, 'c' },
3705 { "apps-sock", 1, 0, 'a' },
3706 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3707 { "kconsumerd-err-sock", 1, 0, 'E' },
3708 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3709 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3710 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3711 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3712 { "consumerd32-path", 1, 0, 'u' },
3713 { "consumerd32-libdir", 1, 0, 'U' },
3714 { "consumerd64-path", 1, 0, 't' },
3715 { "consumerd64-libdir", 1, 0, 'T' },
3716 { "daemonize", 0, 0, 'd' },
3717 { "sig-parent", 0, 0, 'S' },
3718 { "help", 0, 0, 'h' },
3719 { "group", 1, 0, 'g' },
3720 { "version", 0, 0, 'V' },
3721 { "quiet", 0, 0, 'q' },
3722 { "verbose", 0, 0, 'v' },
3723 { "verbose-consumer", 0, 0, 'Z' },
3724 { "no-kernel", 0, 0, 'N' },
3729 int option_index
= 0;
3730 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3731 long_options
, &option_index
);
3738 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3740 fprintf(stderr
, " with arg %s\n", optarg
);
3744 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3747 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3753 opt_tracing_group
= optarg
;
3759 fprintf(stdout
, "%s\n", VERSION
);
3765 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3768 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3771 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3774 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3777 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3780 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3789 /* Verbose level can increase using multiple -v */
3793 opt_verbose_consumer
+= 1;
3796 consumerd32_bin
= optarg
;
3799 consumerd32_libdir
= optarg
;
3802 consumerd64_bin
= optarg
;
3805 consumerd64_libdir
= optarg
;
3808 /* Unknown option or other error.
3809 * Error is printed by getopt, just return */
3818 * Creates the two needed socket by the daemon.
3819 * apps_sock - The communication socket for all UST apps.
3820 * client_sock - The communication of the cli tool (lttng).
3822 static int init_daemon_socket(void)
3827 old_umask
= umask(0);
3829 /* Create client tool unix socket */
3830 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3831 if (client_sock
< 0) {
3832 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3837 /* File permission MUST be 660 */
3838 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3840 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3845 /* Create the application unix socket */
3846 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3847 if (apps_sock
< 0) {
3848 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3853 /* File permission MUST be 666 */
3854 ret
= chmod(apps_unix_sock_path
,
3855 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3857 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3868 * Check if the global socket is available, and if a daemon is answering at the
3869 * other side. If yes, error is returned.
3871 static int check_existing_daemon(void)
3873 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3874 access(apps_unix_sock_path
, F_OK
) < 0) {
3878 /* Is there anybody out there ? */
3879 if (lttng_session_daemon_alive()) {
3887 * Set the tracing group gid onto the client socket.
3889 * Race window between mkdir and chown is OK because we are going from more
3890 * permissive (root.root) to les permissive (root.tracing).
3892 static int set_permissions(char *rundir
)
3897 gid
= allowed_group();
3899 WARN("No tracing group detected");
3904 /* Set lttng run dir */
3905 ret
= chown(rundir
, 0, gid
);
3907 ERR("Unable to set group on %s", rundir
);
3911 /* lttng client socket path */
3912 ret
= chown(client_unix_sock_path
, 0, gid
);
3914 ERR("Unable to set group on %s", client_unix_sock_path
);
3918 /* kconsumer error socket path */
3919 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3921 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3925 /* 64-bit ustconsumer error socket path */
3926 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3928 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3932 /* 32-bit ustconsumer compat32 error socket path */
3933 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3935 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3939 DBG("All permissions are set");
3946 * Create the pipe used to wake up the kernel thread.
3948 static int create_kernel_poll_pipe(void)
3950 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3954 * Create the application command pipe to wake thread_manage_apps.
3956 static int create_apps_cmd_pipe(void)
3958 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3962 * Create the lttng run directory needed for all global sockets and pipe.
3964 static int create_lttng_rundir(const char *rundir
)
3968 DBG3("Creating LTTng run directory: %s", rundir
);
3970 ret
= mkdir(rundir
, S_IRWXU
| S_IRWXG
);
3972 if (errno
!= EEXIST
) {
3973 ERR("Unable to create %s", rundir
);
3985 * Setup sockets and directory needed by the kconsumerd communication with the
3988 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
3992 char path
[PATH_MAX
];
3994 switch (consumer_data
->type
) {
3995 case LTTNG_CONSUMER_KERNEL
:
3996 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
3998 case LTTNG_CONSUMER64_UST
:
3999 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4001 case LTTNG_CONSUMER32_UST
:
4002 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4005 ERR("Consumer type unknown");
4010 DBG2("Creating consumer directory: %s", path
);
4012 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
4014 if (errno
!= EEXIST
) {
4015 ERR("Failed to create %s", path
);
4021 /* Create the kconsumerd error unix socket */
4022 consumer_data
->err_sock
=
4023 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4024 if (consumer_data
->err_sock
< 0) {
4025 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4030 /* File permission MUST be 660 */
4031 ret
= chmod(consumer_data
->err_unix_sock_path
,
4032 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4034 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4044 * Signal handler for the daemon
4046 * Simply stop all worker threads, leaving main() return gracefully after
4047 * joining all threads and calling cleanup().
4049 static void sighandler(int sig
)
4053 DBG("SIGPIPE caugth");
4056 DBG("SIGINT caugth");
4060 DBG("SIGTERM caugth");
4069 * Setup signal handler for :
4070 * SIGINT, SIGTERM, SIGPIPE
4072 static int set_signal_handler(void)
4075 struct sigaction sa
;
4078 if ((ret
= sigemptyset(&sigset
)) < 0) {
4079 perror("sigemptyset");
4083 sa
.sa_handler
= sighandler
;
4084 sa
.sa_mask
= sigset
;
4086 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4087 perror("sigaction");
4091 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4092 perror("sigaction");
4096 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4097 perror("sigaction");
4101 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4107 * Set open files limit to unlimited. This daemon can open a large number of
4108 * file descriptors in order to consumer multiple kernel traces.
4110 static void set_ulimit(void)
4115 /* The kernel does not allowed an infinite limit for open files */
4116 lim
.rlim_cur
= 65535;
4117 lim
.rlim_max
= 65535;
4119 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4121 perror("failed to set open files limit");
4128 int main(int argc
, char **argv
)
4132 const char *home_path
;
4134 rcu_register_thread();
4136 /* Create thread quit pipe */
4137 if ((ret
= init_thread_quit_pipe()) < 0) {
4141 setup_consumerd_path();
4143 /* Parse arguments */
4145 if ((ret
= parse_args(argc
, argv
) < 0)) {
4158 /* Check if daemon is UID = 0 */
4159 is_root
= !getuid();
4162 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4164 /* Create global run dir with root access */
4165 ret
= create_lttng_rundir(rundir
);
4170 if (strlen(apps_unix_sock_path
) == 0) {
4171 snprintf(apps_unix_sock_path
, PATH_MAX
,
4172 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4175 if (strlen(client_unix_sock_path
) == 0) {
4176 snprintf(client_unix_sock_path
, PATH_MAX
,
4177 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4180 /* Set global SHM for ust */
4181 if (strlen(wait_shm_path
) == 0) {
4182 snprintf(wait_shm_path
, PATH_MAX
,
4183 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4186 /* Setup kernel consumerd path */
4187 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4188 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4189 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4190 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4192 DBG2("Kernel consumer err path: %s",
4193 kconsumer_data
.err_unix_sock_path
);
4194 DBG2("Kernel consumer cmd path: %s",
4195 kconsumer_data
.cmd_unix_sock_path
);
4197 home_path
= get_home_dir();
4198 if (home_path
== NULL
) {
4199 /* TODO: Add --socket PATH option */
4200 ERR("Can't get HOME directory for sockets creation.");
4206 * Create rundir from home path. This will create something like
4209 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4215 ret
= create_lttng_rundir(rundir
);
4220 if (strlen(apps_unix_sock_path
) == 0) {
4221 snprintf(apps_unix_sock_path
, PATH_MAX
,
4222 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4225 /* Set the cli tool unix socket path */
4226 if (strlen(client_unix_sock_path
) == 0) {
4227 snprintf(client_unix_sock_path
, PATH_MAX
,
4228 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4231 /* Set global SHM for ust */
4232 if (strlen(wait_shm_path
) == 0) {
4233 snprintf(wait_shm_path
, PATH_MAX
,
4234 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4238 DBG("Client socket path %s", client_unix_sock_path
);
4239 DBG("Application socket path %s", apps_unix_sock_path
);
4240 DBG("LTTng run directory path: %s", rundir
);
4242 /* 32 bits consumerd path setup */
4243 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4244 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4245 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4246 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4248 DBG2("UST consumer 32 bits err path: %s",
4249 ustconsumer32_data
.err_unix_sock_path
);
4250 DBG2("UST consumer 32 bits cmd path: %s",
4251 ustconsumer32_data
.cmd_unix_sock_path
);
4253 /* 64 bits consumerd path setup */
4254 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4255 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4256 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4257 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4259 DBG2("UST consumer 64 bits err path: %s",
4260 ustconsumer64_data
.err_unix_sock_path
);
4261 DBG2("UST consumer 64 bits cmd path: %s",
4262 ustconsumer64_data
.cmd_unix_sock_path
);
4265 * See if daemon already exist.
4267 if ((ret
= check_existing_daemon()) < 0) {
4268 ERR("Already running daemon.\n");
4270 * We do not goto exit because we must not cleanup()
4271 * because a daemon is already running.
4276 /* After this point, we can safely call cleanup() with "goto exit" */
4279 * These actions must be executed as root. We do that *after* setting up
4280 * the sockets path because we MUST make the check for another daemon using
4281 * those paths *before* trying to set the kernel consumer sockets and init
4285 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4290 /* Setup kernel tracer */
4291 if (!opt_no_kernel
) {
4292 init_kernel_tracer();
4295 /* Set ulimit for open files */
4299 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4304 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4309 if ((ret
= set_signal_handler()) < 0) {
4313 /* Setup the needed unix socket */
4314 if ((ret
= init_daemon_socket()) < 0) {
4318 /* Set credentials to socket */
4319 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4323 /* Get parent pid if -S, --sig-parent is specified. */
4324 if (opt_sig_parent
) {
4328 /* Setup the kernel pipe for waking up the kernel thread */
4329 if ((ret
= create_kernel_poll_pipe()) < 0) {
4333 /* Setup the thread apps communication pipe. */
4334 if ((ret
= create_apps_cmd_pipe()) < 0) {
4338 /* Init UST command queue. */
4339 cds_wfq_init(&ust_cmd_queue
.queue
);
4341 /* Init UST app hash table */
4345 * Get session list pointer. This pointer MUST NOT be free(). This list is
4346 * statically declared in session.c
4348 session_list_ptr
= session_get_list();
4350 /* Set up max poll set size */
4351 lttng_poll_set_max_size();
4353 /* Create thread to manage the client socket */
4354 ret
= pthread_create(&client_thread
, NULL
,
4355 thread_manage_clients
, (void *) NULL
);
4357 perror("pthread_create clients");
4361 /* Create thread to dispatch registration */
4362 ret
= pthread_create(&dispatch_thread
, NULL
,
4363 thread_dispatch_ust_registration
, (void *) NULL
);
4365 perror("pthread_create dispatch");
4369 /* Create thread to manage application registration. */
4370 ret
= pthread_create(®_apps_thread
, NULL
,
4371 thread_registration_apps
, (void *) NULL
);
4373 perror("pthread_create registration");
4377 /* Create thread to manage application socket */
4378 ret
= pthread_create(&apps_thread
, NULL
,
4379 thread_manage_apps
, (void *) NULL
);
4381 perror("pthread_create apps");
4385 /* Create kernel thread to manage kernel event */
4386 ret
= pthread_create(&kernel_thread
, NULL
,
4387 thread_manage_kernel
, (void *) NULL
);
4389 perror("pthread_create kernel");
4393 ret
= pthread_join(kernel_thread
, &status
);
4395 perror("pthread_join");
4396 goto error
; /* join error, exit without cleanup */
4400 ret
= pthread_join(apps_thread
, &status
);
4402 perror("pthread_join");
4403 goto error
; /* join error, exit without cleanup */
4407 ret
= pthread_join(reg_apps_thread
, &status
);
4409 perror("pthread_join");
4410 goto error
; /* join error, exit without cleanup */
4414 ret
= pthread_join(dispatch_thread
, &status
);
4416 perror("pthread_join");
4417 goto error
; /* join error, exit without cleanup */
4421 ret
= pthread_join(client_thread
, &status
);
4423 perror("pthread_join");
4424 goto error
; /* join error, exit without cleanup */
4427 ret
= join_consumer_thread(&kconsumer_data
);
4429 perror("join_consumer");
4430 goto error
; /* join error, exit without cleanup */
4436 * cleanup() is called when no other thread is running.
4438 rcu_thread_online();
4440 rcu_thread_offline();
4441 rcu_unregister_thread();