2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
48 #include "compat/poll.h"
52 #include "hashtable.h"
54 #include "lttng-sessiond.h"
60 #define CONSUMERD_FILE "lttng-consumerd"
62 struct consumer_data
{
63 enum lttng_consumer_type type
;
65 pthread_t thread
; /* Worker thread interacting with the consumer */
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex
;
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path
[PATH_MAX
];
77 char cmd_unix_sock_path
[PATH_MAX
];
81 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
82 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
83 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
84 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
87 int opt_verbose
; /* Not static for lttngerr.h */
88 int opt_verbose_consumer
; /* Not static for lttngerr.h */
89 int opt_quiet
; /* Not static for lttngerr.h */
92 const char *opt_tracing_group
;
93 static int opt_sig_parent
;
94 static int opt_daemon
;
95 static int is_root
; /* Set to 1 if the daemon is running as root */
96 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
= KCONSUMERD_ERR_SOCK_PATH
,
102 .cmd_unix_sock_path
= KCONSUMERD_CMD_SOCK_PATH
,
104 static struct consumer_data ustconsumer64_data
= {
105 .type
= LTTNG_CONSUMER64_UST
,
106 .err_unix_sock_path
= USTCONSUMERD64_ERR_SOCK_PATH
,
107 .cmd_unix_sock_path
= USTCONSUMERD64_CMD_SOCK_PATH
,
109 static struct consumer_data ustconsumer32_data
= {
110 .type
= LTTNG_CONSUMER32_UST
,
111 .err_unix_sock_path
= USTCONSUMERD32_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= 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_path
=
175 __stringify(CONFIG_CONSUMERD32_PATH
);
176 static const char *consumerd64_path
=
177 __stringify(CONFIG_CONSUMERD64_PATH
);
178 static const char *consumerd32_libdir
=
179 __stringify(CONFIG_CONSUMERD32_LIBDIR
);
180 static const char *consumerd64_libdir
=
181 __stringify(CONFIG_CONSUMERD64_LIBDIR
);
184 void setup_consumerd_path(void)
186 const char *path
, *libdir
;
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
193 #if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path
[0]) {
195 consumerd32_path
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
197 if (!consumerd32_libdir
[0]) {
198 consumerd32_libdir
= INSTALL_LIB_PATH
;
200 #elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path
[0]) {
202 consumerd64_path
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
204 if (!consumerd64_libdir
[0]) {
205 consumerd64_libdir
= INSTALL_LIB_PATH
;
208 #error "Unknown bitness"
212 * runtime env. var. overrides the build default.
214 path
= getenv("LTTNG_CONSUMERD32_PATH");
216 consumerd32_path
= path
;
218 path
= getenv("LTTNG_CONSUMERD64_PATH");
220 consumerd64_path
= path
;
222 libdir
= getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
224 consumerd32_libdir
= libdir
;
226 libdir
= getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
228 consumerd64_libdir
= libdir
;
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
235 static int create_thread_poll_set(struct lttng_poll_event
*events
,
240 if (events
== NULL
|| size
== 0) {
245 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
251 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
263 * Check if the thread quit pipe was triggered.
265 * Return 1 if it was triggered else 0;
267 static int check_thread_quit_pipe(int fd
, uint32_t events
)
269 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
277 * Remove modules in reverse load order.
279 static int modprobe_remove_kernel_modules(void)
284 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
285 ret
= snprintf(modprobe
, sizeof(modprobe
),
286 "/sbin/modprobe -r -q %s",
287 kernel_modules_list
[i
].name
);
289 perror("snprintf modprobe -r");
292 modprobe
[sizeof(modprobe
) - 1] = '\0';
293 ret
= system(modprobe
);
295 ERR("Unable to launch modprobe -r for module %s",
296 kernel_modules_list
[i
].name
);
297 } else if (kernel_modules_list
[i
].required
298 && WEXITSTATUS(ret
) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list
[i
].name
);
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list
[i
].name
);
312 * Return group ID of the tracing group or -1 if not found.
314 static gid_t
allowed_group(void)
318 if (opt_tracing_group
) {
319 grp
= getgrnam(opt_tracing_group
);
321 grp
= getgrnam(default_tracing_group
);
331 * Init thread quit pipe.
333 * Return -1 on error or 0 if all pipes are created.
335 static int init_thread_quit_pipe(void)
339 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
341 perror("thread quit pipe");
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
353 static void teardown_kernel_session(struct ltt_session
*session
)
355 if (!session
->kernel_session
) {
356 DBG3("No kernel session when tearingdown session");
360 DBG("Tearing down kernel session");
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
366 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
367 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
370 trace_kernel_destroy_session(session
->kernel_session
);
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
377 static void teardown_ust_session(struct ltt_session
*session
)
381 if (!session
->ust_session
) {
382 DBG3("No UST session when tearingdown session");
386 DBG("Tearing down UST session(s)");
388 ret
= ust_app_destroy_trace_all(session
->ust_session
);
390 ERR("Error in ust_app_destroy_trace_all");
393 trace_ust_destroy_session(session
->ust_session
);
397 * Stop all threads by closing the thread quit pipe.
399 static void stop_threads(void)
403 /* Stopping all threads */
404 DBG("Terminating all threads");
405 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
407 ERR("write error on thread quit pipe");
410 /* Dispatch thread */
411 dispatch_thread_exit
= 1;
412 futex_nto1_wake(&ust_cmd_queue
.futex
);
418 static void cleanup(void)
422 struct ltt_session
*sess
, *stmp
;
427 DBG("Removing %s directory", LTTNG_RUNDIR
);
428 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
430 ERR("asprintf failed. Something is really wrong!");
433 /* Remove lttng run directory */
436 ERR("Unable to clean " LTTNG_RUNDIR
);
440 DBG("Cleaning up all session");
442 /* Destroy session list mutex */
443 if (session_list_ptr
!= NULL
) {
444 pthread_mutex_destroy(&session_list_ptr
->lock
);
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess
, stmp
,
448 &session_list_ptr
->head
, list
) {
449 teardown_kernel_session(sess
);
450 teardown_ust_session(sess
);
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
458 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
460 DBG("Closing kernel fd");
461 close(kernel_tracer_fd
);
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
468 close(thread_quit_pipe
[0]);
469 close(thread_quit_pipe
[1]);
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
479 * Send data on a unix socket using the liblttsessiondcomm API.
481 * Return lttcomm error code.
483 static int send_unix_sock(int sock
, void *buf
, size_t len
)
485 /* Check valid length */
490 return lttcomm_send_unix_sock(sock
, buf
, len
);
494 * Free memory of a command context structure.
496 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
498 DBG("Clean command context structure");
500 if ((*cmd_ctx
)->llm
) {
501 free((*cmd_ctx
)->llm
);
503 if ((*cmd_ctx
)->lsm
) {
504 free((*cmd_ctx
)->lsm
);
512 * Send all stream fds of kernel channel to the consumer.
514 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
515 int sock
, struct ltt_kernel_channel
*channel
)
518 struct ltt_kernel_stream
*stream
;
519 struct lttcomm_consumer_msg lkm
;
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel
->channel
->name
);
525 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
526 lkm
.u
.channel
.channel_key
= channel
->fd
;
527 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
528 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
530 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
532 perror("send consumer channel");
537 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
541 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
542 lkm
.u
.stream
.channel_key
= channel
->fd
;
543 lkm
.u
.stream
.stream_key
= stream
->fd
;
544 lkm
.u
.stream
.state
= stream
->state
;
545 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
546 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
547 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
548 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
550 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
552 perror("send consumer stream");
555 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
557 perror("send consumer stream ancillary data");
562 DBG("consumer channel streams sent");
571 * Send all stream fds of the kernel session to the consumer.
573 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
574 struct ltt_kernel_session
*session
)
577 struct ltt_kernel_channel
*chan
;
578 struct lttcomm_consumer_msg lkm
;
579 int sock
= session
->consumer_fd
;
581 DBG("Sending metadata stream fd");
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session
->consumer_fd
== 0) {
585 session
->consumer_fd
= consumer_data
->cmd_sock
;
588 if (session
->metadata_stream_fd
!= 0) {
589 /* Send metadata channel fd */
590 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
591 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
592 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
593 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
595 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
597 perror("send consumer channel");
601 /* Send metadata stream fd */
602 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
603 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
604 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
605 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
606 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
607 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
608 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
609 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
611 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
613 perror("send consumer stream");
616 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
618 perror("send consumer stream");
623 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
624 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
630 DBG("consumer fds (metadata and channel streams) sent");
639 * Notify UST applications using the shm mmap futex.
641 static int notify_ust_apps(int active
)
645 DBG("Notifying applications of session daemon state: %d", active
);
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
649 if (wait_shm_mmap
== NULL
) {
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
656 /* Apps notified successfully */
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
668 * Return total size of the buffer pointed by buf.
670 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
676 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
677 if (cmd_ctx
->llm
== NULL
) {
683 /* Copy common data */
684 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
685 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
687 cmd_ctx
->llm
->data_size
= size
;
688 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
700 static int update_kernel_poll(struct lttng_poll_event
*events
)
703 struct ltt_session
*session
;
704 struct ltt_kernel_channel
*channel
;
706 DBG("Updating kernel poll set");
709 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
710 session_lock(session
);
711 if (session
->kernel_session
== NULL
) {
712 session_unlock(session
);
716 cds_list_for_each_entry(channel
,
717 &session
->kernel_session
->channel_list
.head
, list
) {
718 /* Add channel fd to the kernel poll set */
719 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
721 session_unlock(session
);
724 DBG("Channel fd %d added to kernel set", channel
->fd
);
726 session_unlock(session
);
728 session_unlock_list();
733 session_unlock_list();
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
741 * Useful for CPU hotplug feature.
743 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
746 struct ltt_session
*session
;
747 struct ltt_kernel_channel
*channel
;
749 DBG("Updating kernel streams for channel fd %d", fd
);
752 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
753 session_lock(session
);
754 if (session
->kernel_session
== NULL
) {
755 session_unlock(session
);
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session
->kernel_session
->consumer_fd
== 0) {
761 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
764 cds_list_for_each_entry(channel
,
765 &session
->kernel_session
->channel_list
.head
, list
) {
766 if (channel
->fd
== fd
) {
767 DBG("Channel found, updating kernel streams");
768 ret
= kernel_open_channel_stream(channel
);
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
778 if (session
->kernel_session
->consumer_fds_sent
== 1) {
779 ret
= send_kconsumer_channel_streams(consumer_data
,
780 session
->kernel_session
->consumer_fd
, channel
);
788 session_unlock(session
);
790 session_unlock_list();
794 session_unlock(session
);
795 session_unlock_list();
800 * For each tracing session, update newly registered apps.
802 static void update_ust_app(int app_sock
)
804 struct ltt_session
*sess
, *stmp
;
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
808 if (sess
->ust_session
) {
809 ust_app_global_update(sess
->ust_session
, app_sock
);
815 * This thread manage event coming from the kernel.
817 * Features supported in this thread:
820 static void *thread_manage_kernel(void *data
)
822 int ret
, i
, pollfd
, update_poll_flag
= 1;
823 uint32_t revents
, nb_fd
;
825 struct lttng_poll_event events
;
827 DBG("Thread manage kernel started");
829 ret
= create_thread_poll_set(&events
, 2);
834 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
840 if (update_poll_flag
== 1) {
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
847 ret
= update_kernel_poll(&events
);
851 update_poll_flag
= 0;
854 nb_fd
= LTTNG_POLL_GETNB(&events
);
856 DBG("Thread kernel polling on %d fds", nb_fd
);
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events
);
861 /* Poll infinite value of time */
862 ret
= lttng_poll_wait(&events
, -1);
865 } else if (ret
== 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
872 for (i
= 0; i
< nb_fd
; i
++) {
873 /* Fetch once the poll data */
874 revents
= LTTNG_POLL_GETEV(&events
, i
);
875 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret
= check_thread_quit_pipe(pollfd
, revents
);
883 /* Check for data on kernel pipe */
884 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
885 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
886 update_poll_flag
= 1;
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
893 if (revents
& LPOLLIN
) {
894 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe
[0]);
911 close(kernel_poll_pipe
[1]);
913 lttng_poll_clean(&events
);
919 * This thread manage the consumer error sent back to the session daemon.
921 static void *thread_manage_consumer(void *data
)
923 int sock
= 0, i
, ret
, pollfd
;
924 uint32_t revents
, nb_fd
;
925 enum lttcomm_return_code code
;
926 struct lttng_poll_event events
;
927 struct consumer_data
*consumer_data
= data
;
929 DBG("[thread] Manage consumer started");
931 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
940 ret
= create_thread_poll_set(&events
, 2);
945 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
950 nb_fd
= LTTNG_POLL_GETNB(&events
);
952 /* Inifinite blocking call, waiting for transmission */
953 ret
= lttng_poll_wait(&events
, -1);
958 for (i
= 0; i
< nb_fd
; i
++) {
959 /* Fetch once the poll data */
960 revents
= LTTNG_POLL_GETEV(&events
, i
);
961 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret
= check_thread_quit_pipe(pollfd
, revents
);
969 /* Event on the registration socket */
970 if (pollfd
== consumer_data
->err_sock
) {
971 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
972 ERR("consumer err socket poll error");
978 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
983 DBG2("Receiving code from consumer err_sock");
985 /* Getting status code from kconsumerd */
986 ret
= lttcomm_recv_unix_sock(sock
, &code
,
987 sizeof(enum lttcomm_return_code
));
992 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
993 consumer_data
->cmd_sock
=
994 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
995 if (consumer_data
->cmd_sock
< 0) {
996 sem_post(&consumer_data
->sem
);
997 PERROR("consumer connect");
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data
->sem
);
1002 DBG("consumer command socket ready");
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code
));
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1015 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1020 /* Update number of fd */
1021 nb_fd
= LTTNG_POLL_GETNB(&events
);
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret
= lttng_poll_wait(&events
, -1);
1029 for (i
= 0; i
< nb_fd
; i
++) {
1030 /* Fetch once the poll data */
1031 revents
= LTTNG_POLL_GETEV(&events
, i
);
1032 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret
= check_thread_quit_pipe(pollfd
, revents
);
1040 /* Event on the kconsumerd socket */
1041 if (pollfd
== sock
) {
1042 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1043 ERR("consumer err socket second poll error");
1049 /* Wait for any kconsumerd error */
1050 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1051 sizeof(enum lttcomm_return_code
));
1053 ERR("consumer closed the command socket");
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1060 DBG("consumer thread dying");
1061 close(consumer_data
->err_sock
);
1062 close(consumer_data
->cmd_sock
);
1065 unlink(consumer_data
->err_unix_sock_path
);
1066 unlink(consumer_data
->cmd_unix_sock_path
);
1067 consumer_data
->pid
= 0;
1069 lttng_poll_clean(&events
);
1075 * This thread manage application communication.
1077 static void *thread_manage_apps(void *data
)
1080 uint32_t revents
, nb_fd
;
1081 struct ust_command ust_cmd
;
1082 struct lttng_poll_event events
;
1084 DBG("[thread] Manage application started");
1086 rcu_register_thread();
1087 rcu_thread_online();
1089 ret
= create_thread_poll_set(&events
, 2);
1094 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events
);
1103 nb_fd
= LTTNG_POLL_GETNB(&events
);
1105 DBG("Apps thread polling on %d fds", nb_fd
);
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret
= lttng_poll_wait(&events
, -1);
1113 for (i
= 0; i
< nb_fd
; i
++) {
1114 /* Fetch once the poll data */
1115 revents
= LTTNG_POLL_GETEV(&events
, i
);
1116 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret
= check_thread_quit_pipe(pollfd
, revents
);
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd
== apps_cmd_pipe
[0]) {
1126 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1127 ERR("Apps command pipe error");
1129 } else if (revents
& LPOLLIN
) {
1131 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1132 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1133 perror("read apps cmd pipe");
1137 /* Register applicaton to the session daemon */
1138 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1140 if (ret
== -ENOMEM
) {
1142 } else if (ret
< 0) {
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1150 update_ust_app(ust_cmd
.sock
);
1152 ret
= ustctl_register_done(ust_cmd
.sock
);
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1158 ust_app_unregister(ust_cmd
.sock
);
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1164 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1169 DBG("Apps with sock %d added to poll set",
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1180 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1181 /* Removing from the poll set */
1182 ret
= lttng_poll_del(&events
, pollfd
);
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd
);
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe
[0]);
1198 close(apps_cmd_pipe
[1]);
1200 lttng_poll_clean(&events
);
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1211 static void *thread_dispatch_ust_registration(void *data
)
1214 struct cds_wfq_node
*node
;
1215 struct ust_command
*ust_cmd
= NULL
;
1217 DBG("[thread] Dispatch UST command started");
1219 while (!dispatch_thread_exit
) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1224 /* Dequeue command for registration */
1225 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1232 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1237 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1238 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1239 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1245 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1246 sizeof(struct ust_command
));
1248 perror("write apps cmd pipe");
1249 if (errno
== EBADF
) {
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1260 } while (node
!= NULL
);
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue
.futex
);
1267 DBG("Dispatch thread dying");
1272 * This thread manage application registration.
1274 static void *thread_registration_apps(void *data
)
1276 int sock
= 0, i
, ret
, pollfd
;
1277 uint32_t revents
, nb_fd
;
1278 struct lttng_poll_event events
;
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1283 struct ust_command
*ust_cmd
= NULL
;
1285 DBG("[thread] Manage application registration started");
1287 ret
= lttcomm_listen_unix_sock(apps_sock
);
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1296 ret
= create_thread_poll_set(&events
, 2);
1301 /* Add the application registration socket */
1302 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1307 /* Notify all applications to register */
1308 ret
= notify_ust_apps(1);
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1316 DBG("Accepting application registration");
1318 nb_fd
= LTTNG_POLL_GETNB(&events
);
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret
= lttng_poll_wait(&events
, -1);
1326 for (i
= 0; i
< nb_fd
; i
++) {
1327 /* Fetch once the poll data */
1328 revents
= LTTNG_POLL_GETEV(&events
, i
);
1329 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret
= check_thread_quit_pipe(pollfd
, revents
);
1337 /* Event on the registration socket */
1338 if (pollfd
== apps_sock
) {
1339 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1340 ERR("Register apps socket poll error");
1342 } else if (revents
& LPOLLIN
) {
1343 sock
= lttcomm_accept_unix_sock(apps_sock
);
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1350 if (ust_cmd
== NULL
) {
1351 perror("ust command zmalloc");
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1359 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1360 sizeof(struct ust_register_msg
));
1361 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1363 perror("lttcomm_recv_unix_sock register apps");
1365 ERR("Wrong size received on apps register");
1372 ust_cmd
->sock
= sock
;
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1377 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1378 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1379 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1385 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1391 futex_nto1_wake(&ust_cmd_queue
.futex
);
1398 DBG("UST Registration thread dying");
1400 /* Notify that the registration thread is gone */
1405 unlink(apps_unix_sock_path
);
1407 lttng_poll_clean(&events
);
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1416 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1419 struct timespec timeout
;
1421 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1422 timeout
.tv_nsec
= 0;
1424 /* Setup semaphore */
1425 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1427 PERROR("sem_init consumer semaphore");
1431 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1432 thread_manage_consumer
, consumer_data
);
1434 PERROR("pthread_create consumer");
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret
= sem_wait(&consumer_data
->sem
);
1446 /* Normal timeout if the gettime was successful */
1447 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1448 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1452 if (errno
== ETIMEDOUT
) {
1454 * Call has timed out so we kill the kconsumerd_thread and return
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret
= pthread_cancel(consumer_data
->thread
);
1460 PERROR("pthread_cancel consumer thread");
1463 PERROR("semaphore wait failed consumer thread");
1468 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1469 if (consumer_data
->pid
== 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1474 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1483 * Join consumer thread
1485 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1490 if (consumer_data
->pid
!= 0) {
1491 ret
= kill(consumer_data
->pid
, SIGTERM
);
1493 ERR("Error killing consumer daemon");
1496 return pthread_join(consumer_data
->thread
, &status
);
1503 * Fork and exec a consumer daemon (consumerd).
1505 * Return pid if successful else -1.
1507 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1511 const char *verbosity
;
1513 DBG("Spawning consumerd");
1520 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1521 verbosity
= "--verbose";
1523 verbosity
= "--quiet";
1525 switch (consumer_data
->type
) {
1526 case LTTNG_CONSUMER_KERNEL
:
1527 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1528 "lttng-consumerd", verbosity
, "-k",
1529 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1530 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1533 case LTTNG_CONSUMER64_UST
:
1537 if (consumerd64_libdir
[0] != '\0') {
1541 tmp
= getenv("LD_LIBRARY_PATH");
1545 tmplen
= strlen("LD_LIBRARY_PATH=")
1546 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1547 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1552 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1553 strcat(tmpnew
, consumerd64_libdir
);
1554 if (tmp
[0] != '\0') {
1555 strcat(tmpnew
, ":");
1556 strcat(tmpnew
, tmp
);
1558 ret
= putenv(tmpnew
);
1564 ret
= execl(consumerd64_path
, verbosity
, "-u",
1565 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1566 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1568 if (consumerd64_libdir
[0] != '\0') {
1576 case LTTNG_CONSUMER32_UST
:
1578 char *tmpnew
= NULL
;
1580 if (consumerd32_libdir
[0] != '\0') {
1584 tmp
= getenv("LD_LIBRARY_PATH");
1588 tmplen
= strlen("LD_LIBRARY_PATH=")
1589 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1590 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1595 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1596 strcat(tmpnew
, consumerd32_libdir
);
1597 if (tmp
[0] != '\0') {
1598 strcat(tmpnew
, ":");
1599 strcat(tmpnew
, tmp
);
1601 ret
= putenv(tmpnew
);
1607 ret
= execl(consumerd32_path
, verbosity
, "-u",
1608 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1609 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1611 if (consumerd32_libdir
[0] != '\0') {
1620 perror("unknown consumer type");
1624 perror("kernel start consumer exec");
1627 } else if (pid
> 0) {
1630 perror("start consumer fork");
1638 * Spawn the consumerd daemon and session daemon thread.
1640 static int start_consumerd(struct consumer_data
*consumer_data
)
1644 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1645 if (consumer_data
->pid
!= 0) {
1646 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1650 ret
= spawn_consumerd(consumer_data
);
1652 ERR("Spawning consumerd failed");
1653 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1657 /* Setting up the consumer_data pid */
1658 consumer_data
->pid
= ret
;
1659 DBG2("Consumer pid %d", consumer_data
->pid
);
1660 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1662 DBG2("Spawning consumer control thread");
1663 ret
= spawn_consumer_thread(consumer_data
);
1665 ERR("Fatal error spawning consumer control thread");
1677 * modprobe_kernel_modules
1679 static int modprobe_kernel_modules(void)
1684 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1685 ret
= snprintf(modprobe
, sizeof(modprobe
),
1686 "/sbin/modprobe %s%s",
1687 kernel_modules_list
[i
].required
? "" : "-q ",
1688 kernel_modules_list
[i
].name
);
1690 perror("snprintf modprobe");
1693 modprobe
[sizeof(modprobe
) - 1] = '\0';
1694 ret
= system(modprobe
);
1696 ERR("Unable to launch modprobe for module %s",
1697 kernel_modules_list
[i
].name
);
1698 } else if (kernel_modules_list
[i
].required
1699 && WEXITSTATUS(ret
) != 0) {
1700 ERR("Unable to load module %s",
1701 kernel_modules_list
[i
].name
);
1703 DBG("Modprobe successfully %s",
1704 kernel_modules_list
[i
].name
);
1715 static int mount_debugfs(char *path
)
1718 char *type
= "debugfs";
1720 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1722 PERROR("Cannot create debugfs path");
1726 ret
= mount(type
, path
, type
, 0, NULL
);
1728 PERROR("Cannot mount debugfs");
1732 DBG("Mounted debugfs successfully at %s", path
);
1739 * Setup necessary data for kernel tracer action.
1741 static void init_kernel_tracer(void)
1744 char *proc_mounts
= "/proc/mounts";
1746 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1749 /* Detect debugfs */
1750 fp
= fopen(proc_mounts
, "r");
1752 ERR("Unable to probe %s", proc_mounts
);
1756 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1757 if (strstr(line
, "debugfs") != NULL
) {
1758 /* Remove first string */
1760 /* Dup string here so we can reuse line later on */
1761 debugfs_path
= strdup(strtok(NULL
, " "));
1762 DBG("Got debugfs path : %s", debugfs_path
);
1769 /* Mount debugfs if needded */
1770 if (debugfs_path
== NULL
) {
1771 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1773 perror("asprintf debugfs path");
1776 ret
= mount_debugfs(debugfs_path
);
1778 perror("Cannot mount debugfs");
1783 /* Modprobe lttng kernel modules */
1784 ret
= modprobe_kernel_modules();
1789 /* Setup lttng kernel path */
1790 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1792 perror("asprintf lttng path");
1796 /* Open debugfs lttng */
1797 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1798 if (kernel_tracer_fd
< 0) {
1799 DBG("Failed to open %s", lttng_path
);
1805 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1815 WARN("No kernel tracer available");
1816 kernel_tracer_fd
= 0;
1821 * Init tracing by creating trace directory and sending fds kernel consumer.
1823 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1827 if (session
->consumer_fds_sent
== 0) {
1829 * Assign default kernel consumer socket if no consumer assigned to the
1830 * kernel session. At this point, it's NOT suppose to be 0 but this is
1831 * an extra security check.
1833 if (session
->consumer_fd
== 0) {
1834 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1837 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1839 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1843 session
->consumer_fds_sent
= 1;
1851 * Create an UST session and add it to the session ust list.
1853 static int create_ust_session(struct ltt_session
*session
,
1854 struct lttng_domain
*domain
)
1858 struct ltt_ust_session
*lus
= NULL
;
1860 switch (domain
->type
) {
1861 case LTTNG_DOMAIN_UST
:
1864 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1868 DBG("Creating UST session");
1871 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1873 ret
= LTTCOMM_UST_SESS_FAIL
;
1877 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1878 geteuid(), allowed_group());
1880 if (ret
!= -EEXIST
) {
1881 ERR("Trace directory creation error");
1882 ret
= LTTCOMM_UST_SESS_FAIL
;
1887 /* The domain type dictate different actions on session creation */
1888 switch (domain
->type
) {
1889 case LTTNG_DOMAIN_UST
:
1890 /* No ustctl for the global UST domain */
1893 ERR("Unknown UST domain on create session %d", domain
->type
);
1896 session
->ust_session
= lus
;
1906 * Create a kernel tracer session then create the default channel.
1908 static int create_kernel_session(struct ltt_session
*session
)
1912 DBG("Creating kernel session");
1914 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1916 ret
= LTTCOMM_KERN_SESS_FAIL
;
1920 /* Set kernel consumer socket fd */
1921 if (kconsumer_data
.cmd_sock
) {
1922 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1925 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1926 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1928 if (ret
!= -EEXIST
) {
1929 ERR("Trace directory creation error");
1939 * Using the session list, filled a lttng_session array to send back to the
1940 * client for session listing.
1942 * The session list lock MUST be acquired before calling this function. Use
1943 * session_lock_list() and session_unlock_list().
1945 static void list_lttng_sessions(struct lttng_session
*sessions
)
1948 struct ltt_session
*session
;
1950 DBG("Getting all available session");
1952 * Iterate over session list and append data after the control struct in
1955 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1956 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1957 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1958 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1959 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1960 sessions
[i
].enabled
= session
->enabled
;
1966 * Fill lttng_channel array of all channels.
1968 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1969 struct lttng_channel
*channels
)
1972 struct ltt_kernel_channel
*kchan
;
1974 DBG("Listing channels for session %s", session
->name
);
1977 case LTTNG_DOMAIN_KERNEL
:
1978 /* Kernel channels */
1979 if (session
->kernel_session
!= NULL
) {
1980 cds_list_for_each_entry(kchan
,
1981 &session
->kernel_session
->channel_list
.head
, list
) {
1982 /* Copy lttng_channel struct to array */
1983 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1984 channels
[i
].enabled
= kchan
->enabled
;
1989 case LTTNG_DOMAIN_UST
:
1991 struct cds_lfht_iter iter
;
1992 struct ltt_ust_channel
*uchan
;
1994 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1995 &iter
, uchan
, node
) {
1996 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1997 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1998 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1999 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2000 channels
[i
].attr
.switch_timer_interval
=
2001 uchan
->attr
.switch_timer_interval
;
2002 channels
[i
].attr
.read_timer_interval
=
2003 uchan
->attr
.read_timer_interval
;
2004 channels
[i
].enabled
= uchan
->enabled
;
2005 switch (uchan
->attr
.output
) {
2006 case LTTNG_UST_MMAP
:
2008 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2021 * Create a list of ust global domain events.
2023 static int list_lttng_ust_global_events(char *channel_name
,
2024 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2027 unsigned int nb_event
= 0;
2028 struct cds_lfht_iter iter
;
2029 struct cds_lfht_node
*node
;
2030 struct ltt_ust_channel
*uchan
;
2031 struct ltt_ust_event
*uevent
;
2032 struct lttng_event
*tmp
;
2034 DBG("Listing UST global events for channel %s", channel_name
);
2038 node
= hashtable_lookup(ust_global
->channels
, (void *) channel_name
,
2039 strlen(channel_name
), &iter
);
2041 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2045 uchan
= caa_container_of(node
, struct ltt_ust_channel
, node
);
2047 nb_event
+= hashtable_get_count(uchan
->events
);
2049 if (nb_event
== 0) {
2054 DBG3("Listing UST global %d events", nb_event
);
2056 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2058 ret
= -LTTCOMM_FATAL
;
2062 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
2063 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2064 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2065 tmp
[i
].enabled
= uevent
->enabled
;
2066 switch (uevent
->attr
.instrumentation
) {
2067 case LTTNG_UST_TRACEPOINT
:
2068 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2070 case LTTNG_UST_PROBE
:
2071 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2073 case LTTNG_UST_FUNCTION
:
2074 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2089 * Fill lttng_event array of all kernel events in the channel.
2091 static int list_lttng_kernel_events(char *channel_name
,
2092 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2095 unsigned int nb_event
;
2096 struct ltt_kernel_event
*event
;
2097 struct ltt_kernel_channel
*kchan
;
2099 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2100 if (kchan
== NULL
) {
2101 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2105 nb_event
= kchan
->event_count
;
2107 DBG("Listing events for channel %s", kchan
->channel
->name
);
2109 if (nb_event
== 0) {
2114 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2115 if (*events
== NULL
) {
2116 ret
= LTTCOMM_FATAL
;
2120 /* Kernel channels */
2121 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2122 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2123 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2124 (*events
)[i
].enabled
= event
->enabled
;
2125 switch (event
->event
->instrumentation
) {
2126 case LTTNG_KERNEL_TRACEPOINT
:
2127 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2129 case LTTNG_KERNEL_KPROBE
:
2130 case LTTNG_KERNEL_KRETPROBE
:
2131 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2132 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2133 sizeof(struct lttng_kernel_kprobe
));
2135 case LTTNG_KERNEL_FUNCTION
:
2136 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2137 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2138 sizeof(struct lttng_kernel_function
));
2140 case LTTNG_KERNEL_NOOP
:
2141 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2143 case LTTNG_KERNEL_SYSCALL
:
2144 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2146 case LTTNG_KERNEL_ALL
:
2160 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2162 static int cmd_disable_channel(struct ltt_session
*session
,
2163 int domain
, char *channel_name
)
2166 struct ltt_ust_session
*usess
;
2168 usess
= session
->ust_session
;
2171 case LTTNG_DOMAIN_KERNEL
:
2173 ret
= channel_kernel_disable(session
->kernel_session
,
2175 if (ret
!= LTTCOMM_OK
) {
2179 kernel_wait_quiescent(kernel_tracer_fd
);
2182 case LTTNG_DOMAIN_UST
:
2184 struct ltt_ust_channel
*uchan
;
2186 /* Get channel in global UST domain HT */
2187 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2189 if (uchan
== NULL
) {
2190 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2194 ret
= ust_app_disable_channel_all(usess
, uchan
);
2196 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2204 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2205 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2206 case LTTNG_DOMAIN_UST_PID
:
2207 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2210 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2221 * Copy channel from attributes and set it in the application channel list.
2224 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2225 struct lttng_channel *attr, struct ust_app *app)
2228 struct ltt_ust_channel *uchan, *new_chan;
2230 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2231 if (uchan == NULL) {
2232 ret = LTTCOMM_FATAL;
2236 new_chan = trace_ust_create_channel(attr, usess->path);
2237 if (new_chan == NULL) {
2238 PERROR("malloc ltt_ust_channel");
2239 ret = LTTCOMM_FATAL;
2243 ret = channel_ust_copy(new_chan, uchan);
2245 ret = LTTCOMM_FATAL;
2255 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2257 static int cmd_enable_channel(struct ltt_session
*session
,
2258 int domain
, struct lttng_channel
*attr
)
2261 struct ltt_ust_session
*usess
= session
->ust_session
;
2263 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2266 case LTTNG_DOMAIN_KERNEL
:
2268 struct ltt_kernel_channel
*kchan
;
2270 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2271 session
->kernel_session
);
2272 if (kchan
== NULL
) {
2273 ret
= channel_kernel_create(session
->kernel_session
,
2274 attr
, kernel_poll_pipe
[1]);
2276 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2279 if (ret
!= LTTCOMM_OK
) {
2283 kernel_wait_quiescent(kernel_tracer_fd
);
2286 case LTTNG_DOMAIN_UST
:
2288 struct ltt_ust_channel
*uchan
;
2290 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2292 /* Get channel in global UST domain HT */
2293 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2295 if (uchan
== NULL
) {
2296 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2297 if (uchan
== NULL
) {
2298 ret
= LTTCOMM_UST_CHAN_FAIL
;
2303 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2305 DBG2("UST channel %s added to global domain HT", attr
->name
);
2307 /* Add channel to all registered applications */
2308 ret
= ust_app_create_channel_all(usess
, uchan
);
2310 ret
= LTTCOMM_UST_CHAN_FAIL
;
2314 /* If already enabled, everything is OK */
2315 if (uchan
->enabled
) {
2320 ret
= ust_app_enable_channel_all(usess
, uchan
);
2322 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2331 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2332 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2333 case LTTNG_DOMAIN_UST_PID
:
2334 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2337 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2348 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2350 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2351 char *channel_name
, char *event_name
)
2356 case LTTNG_DOMAIN_KERNEL
:
2358 struct ltt_kernel_channel
*kchan
;
2359 struct ltt_kernel_session
*ksess
;
2361 ksess
= session
->kernel_session
;
2363 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2364 if (kchan
== NULL
) {
2365 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2369 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2370 if (ret
!= LTTCOMM_OK
) {
2374 kernel_wait_quiescent(kernel_tracer_fd
);
2377 case LTTNG_DOMAIN_UST
:
2379 struct ltt_ust_session
*usess
;
2380 struct ltt_ust_channel
*uchan
;
2382 usess
= session
->ust_session
;
2384 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2386 if (uchan
== NULL
) {
2387 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2391 ret
= ust_app_disable_event(usess
, uchan
, event_name
);
2393 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2397 DBG2("Disable UST event %s in channel %s completed", event_name
,
2402 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2403 case LTTNG_DOMAIN_UST_PID
:
2404 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2406 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2417 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2419 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2425 case LTTNG_DOMAIN_KERNEL
:
2427 struct ltt_kernel_session
*ksess
;
2428 struct ltt_kernel_channel
*kchan
;
2430 ksess
= session
->kernel_session
;
2432 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2433 if (kchan
== NULL
) {
2434 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2438 ret
= event_kernel_disable_all(ksess
, kchan
);
2439 if (ret
!= LTTCOMM_OK
) {
2443 kernel_wait_quiescent(kernel_tracer_fd
);
2446 case LTTNG_DOMAIN_UST
:
2448 struct ltt_ust_session
*usess
;
2449 struct ltt_ust_channel
*uchan
;
2451 usess
= session
->ust_session
;
2453 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2455 if (uchan
== NULL
) {
2456 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2460 ret
= ust_app_disable_event_all(usess
, uchan
);
2462 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2466 DBG2("Disable all UST event in channel %s completed", channel_name
);
2470 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2471 case LTTNG_DOMAIN_UST_PID
:
2472 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2474 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2485 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2487 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2488 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2493 case LTTNG_DOMAIN_KERNEL
:
2494 /* Add kernel context to kernel tracer */
2495 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2496 event_name
, channel_name
);
2497 if (ret
!= LTTCOMM_OK
) {
2501 case LTTNG_DOMAIN_UST
:
2504 struct ltt_ust_session *usess;
2506 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2507 ret = context_ust_add(usess, ctx,
2508 event_name, channel_name, domain);
2509 if (ret != LTTCOMM_OK) {
2517 /* TODO: UST other domains */
2518 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2529 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2531 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2532 char *channel_name
, struct lttng_event
*event
)
2535 struct lttng_channel
*attr
;
2536 struct ltt_ust_session
*usess
= session
->ust_session
;
2539 case LTTNG_DOMAIN_KERNEL
:
2541 struct ltt_kernel_channel
*kchan
;
2543 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2544 session
->kernel_session
);
2545 if (kchan
== NULL
) {
2546 attr
= channel_new_default_attr(domain
);
2548 ret
= LTTCOMM_FATAL
;
2551 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2553 /* This call will notify the kernel thread */
2554 ret
= channel_kernel_create(session
->kernel_session
,
2555 attr
, kernel_poll_pipe
[1]);
2556 if (ret
!= LTTCOMM_OK
) {
2563 /* Get the newly created kernel channel pointer */
2564 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2565 session
->kernel_session
);
2566 if (kchan
== NULL
) {
2567 /* This sould not happen... */
2568 ret
= LTTCOMM_FATAL
;
2572 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2574 if (ret
!= LTTCOMM_OK
) {
2578 kernel_wait_quiescent(kernel_tracer_fd
);
2581 case LTTNG_DOMAIN_UST
:
2583 struct ltt_ust_channel
*uchan
;
2584 struct ltt_ust_event
*uevent
;
2585 struct lttng_channel
*attr
;
2587 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2589 if (uchan
== NULL
) {
2590 /* Create default channel */
2591 attr
= channel_new_default_attr(domain
);
2593 ret
= LTTCOMM_FATAL
;
2596 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2598 /* Use the internal command enable channel */
2599 ret
= cmd_enable_channel(session
, domain
, attr
);
2607 /* Get the newly created channel reference back */
2608 uchan
= trace_ust_find_channel_by_name(
2609 usess
->domain_global
.channels
, channel_name
);
2610 if (uchan
== NULL
) {
2611 /* Something is really wrong */
2612 ret
= LTTCOMM_FATAL
;
2617 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2618 if (uevent
== NULL
) {
2619 uevent
= trace_ust_create_event(event
);
2620 if (uevent
== NULL
) {
2621 ret
= LTTCOMM_FATAL
;
2627 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2629 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2633 /* Add ltt ust event to channel */
2635 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2638 uevent
->enabled
= 1;
2640 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
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_ENABLE_ALL_EVENT processed by the client thread.
2661 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2662 char *channel_name
, int event_type
)
2665 struct ltt_kernel_channel
*kchan
;
2668 case LTTNG_DOMAIN_KERNEL
:
2669 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2670 session
->kernel_session
);
2671 if (kchan
== NULL
) {
2672 /* This call will notify the kernel thread */
2673 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2674 kernel_poll_pipe
[1]);
2675 if (ret
!= LTTCOMM_OK
) {
2680 /* Get the newly created kernel channel pointer */
2681 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2682 session
->kernel_session
);
2683 if (kchan
== NULL
) {
2684 /* This sould not happen... */
2685 ret
= LTTCOMM_FATAL
;
2689 switch (event_type
) {
2690 case LTTNG_KERNEL_SYSCALL
:
2691 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2692 kchan
, kernel_tracer_fd
);
2694 case LTTNG_KERNEL_TRACEPOINT
:
2696 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2697 * events already registered to the channel.
2699 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2700 kchan
, kernel_tracer_fd
);
2702 case LTTNG_KERNEL_ALL
:
2703 /* Enable syscalls and tracepoints */
2704 ret
= event_kernel_enable_all(session
->kernel_session
,
2705 kchan
, kernel_tracer_fd
);
2708 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2711 if (ret
!= LTTCOMM_OK
) {
2715 kernel_wait_quiescent(kernel_tracer_fd
);
2718 /* TODO: Userspace tracing */
2719 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2730 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2732 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2735 ssize_t nb_events
= 0;
2738 case LTTNG_DOMAIN_KERNEL
:
2739 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2740 if (nb_events
< 0) {
2741 ret
= LTTCOMM_KERN_LIST_FAIL
;
2745 case LTTNG_DOMAIN_UST
:
2746 nb_events
= ust_app_list_events(events
);
2747 if (nb_events
< 0) {
2748 ret
= LTTCOMM_UST_LIST_FAIL
;
2753 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2760 /* Return negative value to differentiate return code */
2765 * Command LTTNG_START_TRACE processed by the client thread.
2767 static int cmd_start_trace(struct ltt_session
*session
)
2770 struct ltt_kernel_session
*ksession
;
2771 struct ltt_ust_session
*usess
;
2774 ksession
= session
->kernel_session
;
2775 usess
= session
->ust_session
;
2777 if (session
->enabled
)
2778 return LTTCOMM_UST_START_FAIL
;
2779 session
->enabled
= 1;
2781 /* Kernel tracing */
2782 if (ksession
!= NULL
) {
2783 struct ltt_kernel_channel
*kchan
;
2785 /* Open kernel metadata */
2786 if (ksession
->metadata
== NULL
) {
2787 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2789 ret
= LTTCOMM_KERN_META_FAIL
;
2794 /* Open kernel metadata stream */
2795 if (ksession
->metadata_stream_fd
== 0) {
2796 ret
= kernel_open_metadata_stream(ksession
);
2798 ERR("Kernel create metadata stream failed");
2799 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2804 /* For each channel */
2805 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2806 if (kchan
->stream_count
== 0) {
2807 ret
= kernel_open_channel_stream(kchan
);
2809 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2812 /* Update the stream global counter */
2813 ksession
->stream_count_global
+= ret
;
2817 /* Setup kernel consumer socket and send fds to it */
2818 ret
= init_kernel_tracing(ksession
);
2820 ret
= LTTCOMM_KERN_START_FAIL
;
2824 /* This start the kernel tracing */
2825 ret
= kernel_start_session(ksession
);
2827 ret
= LTTCOMM_KERN_START_FAIL
;
2831 /* Quiescent wait after starting trace */
2832 kernel_wait_quiescent(kernel_tracer_fd
);
2835 /* Flag session that trace should start automatically */
2837 usess
->start_trace
= 1;
2839 ret
= ust_app_start_trace_all(usess
);
2841 ret
= LTTCOMM_UST_START_FAIL
;
2853 * Command LTTNG_STOP_TRACE processed by the client thread.
2855 static int cmd_stop_trace(struct ltt_session
*session
)
2858 struct ltt_kernel_channel
*kchan
;
2859 struct ltt_kernel_session
*ksession
;
2860 struct ltt_ust_session
*usess
;
2863 ksession
= session
->kernel_session
;
2864 usess
= session
->ust_session
;
2866 if (!session
->enabled
)
2867 return LTTCOMM_UST_START_FAIL
;
2868 session
->enabled
= 0;
2871 if (ksession
!= NULL
) {
2872 DBG("Stop kernel tracing");
2874 /* Flush all buffers before stopping */
2875 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2877 ERR("Kernel metadata flush failed");
2880 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2881 ret
= kernel_flush_buffer(kchan
);
2883 ERR("Kernel flush buffer error");
2887 ret
= kernel_stop_session(ksession
);
2889 ret
= LTTCOMM_KERN_STOP_FAIL
;
2893 kernel_wait_quiescent(kernel_tracer_fd
);
2897 usess
->start_trace
= 0;
2899 ret
= ust_app_stop_trace_all(usess
);
2901 ret
= LTTCOMM_UST_START_FAIL
;
2913 * Command LTTNG_CREATE_SESSION processed by the client thread.
2915 static int cmd_create_session(char *name
, char *path
)
2919 ret
= session_create(name
, path
);
2920 if (ret
!= LTTCOMM_OK
) {
2931 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2933 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2937 /* Clean kernel session teardown */
2938 teardown_kernel_session(session
);
2939 /* UST session teardown */
2940 teardown_ust_session(session
);
2943 * Must notify the kernel thread here to update it's poll setin order
2944 * to remove the channel(s)' fd just destroyed.
2946 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2948 perror("write kernel poll pipe");
2951 ret
= session_destroy(session
);
2957 * Command LTTNG_CALIBRATE processed by the client thread.
2959 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2964 case LTTNG_DOMAIN_KERNEL
:
2966 struct lttng_kernel_calibrate kcalibrate
;
2968 kcalibrate
.type
= calibrate
->type
;
2969 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2971 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2977 /* TODO: Userspace tracing */
2978 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2989 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2991 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2997 case LTTNG_DOMAIN_KERNEL
:
2998 /* Can't register a consumer if there is already one */
2999 if (session
->kernel_session
->consumer_fd
!= 0) {
3000 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3004 sock
= lttcomm_connect_unix_sock(sock_path
);
3006 ret
= LTTCOMM_CONNECT_FAIL
;
3010 session
->kernel_session
->consumer_fd
= sock
;
3013 /* TODO: Userspace tracing */
3014 ret
= LTTCOMM_NOT_IMPLEMENTED
;
3025 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3027 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3028 struct lttng_domain
**domains
)
3033 if (session
->kernel_session
!= NULL
) {
3034 DBG3("Listing domains found kernel domain");
3038 if (session
->ust_session
!= NULL
) {
3039 DBG3("Listing domains found UST global domain");
3043 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3044 if (*domains
== NULL
) {
3045 ret
= -LTTCOMM_FATAL
;
3049 if (session
->kernel_session
!= NULL
) {
3050 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3054 if (session
->ust_session
!= NULL
) {
3055 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3066 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3068 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3069 struct lttng_channel
**channels
)
3072 ssize_t nb_chan
= 0;
3075 case LTTNG_DOMAIN_KERNEL
:
3076 if (session
->kernel_session
!= NULL
) {
3077 nb_chan
= session
->kernel_session
->channel_count
;
3079 DBG3("Number of kernel channels %zd", nb_chan
);
3081 case LTTNG_DOMAIN_UST
:
3082 if (session
->ust_session
!= NULL
) {
3083 nb_chan
= hashtable_get_count(
3084 session
->ust_session
->domain_global
.channels
);
3086 DBG3("Number of UST global channels %zd", nb_chan
);
3090 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3095 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3096 if (*channels
== NULL
) {
3097 ret
= -LTTCOMM_FATAL
;
3101 list_lttng_channels(domain
, session
, *channels
);
3113 * Command LTTNG_LIST_EVENTS processed by the client thread.
3115 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3116 char *channel_name
, struct lttng_event
**events
)
3119 ssize_t nb_event
= 0;
3122 case LTTNG_DOMAIN_KERNEL
:
3123 if (session
->kernel_session
!= NULL
) {
3124 nb_event
= list_lttng_kernel_events(channel_name
,
3125 session
->kernel_session
, events
);
3128 case LTTNG_DOMAIN_UST
:
3130 if (session
->ust_session
!= NULL
) {
3131 nb_event
= list_lttng_ust_global_events(channel_name
,
3132 &session
->ust_session
->domain_global
, events
);
3137 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3148 * Process the command requested by the lttng client within the command
3149 * context structure. This function make sure that the return structure (llm)
3150 * is set and ready for transmission before returning.
3152 * Return any error encountered or 0 for success.
3154 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3156 int ret
= LTTCOMM_OK
;
3157 int need_tracing_session
= 1;
3159 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3162 * Check for command that don't needs to allocate a returned payload. We do
3163 * this here so we don't have to make the call for no payload at each
3166 switch(cmd_ctx
->lsm
->cmd_type
) {
3167 case LTTNG_LIST_SESSIONS
:
3168 case LTTNG_LIST_TRACEPOINTS
:
3169 case LTTNG_LIST_DOMAINS
:
3170 case LTTNG_LIST_CHANNELS
:
3171 case LTTNG_LIST_EVENTS
:
3174 /* Setup lttng message with no payload */
3175 ret
= setup_lttng_msg(cmd_ctx
, 0);
3177 /* This label does not try to unlock the session */
3178 goto init_setup_error
;
3182 /* Commands that DO NOT need a session. */
3183 switch (cmd_ctx
->lsm
->cmd_type
) {
3184 case LTTNG_CALIBRATE
:
3185 case LTTNG_CREATE_SESSION
:
3186 case LTTNG_LIST_SESSIONS
:
3187 case LTTNG_LIST_TRACEPOINTS
:
3188 need_tracing_session
= 0;
3191 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3192 session_lock_list();
3193 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3194 session_unlock_list();
3195 if (cmd_ctx
->session
== NULL
) {
3196 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3197 ret
= LTTCOMM_SESS_NOT_FOUND
;
3199 /* If no session name specified */
3200 ret
= LTTCOMM_SELECT_SESS
;
3204 /* Acquire lock for the session */
3205 session_lock(cmd_ctx
->session
);
3211 * Check domain type for specific "pre-action".
3213 switch (cmd_ctx
->lsm
->domain
.type
) {
3214 case LTTNG_DOMAIN_KERNEL
:
3215 /* Kernel tracer check */
3216 if (kernel_tracer_fd
== 0) {
3217 /* Basically, load kernel tracer modules */
3218 init_kernel_tracer();
3219 if (kernel_tracer_fd
== 0) {
3220 ret
= LTTCOMM_KERN_NA
;
3225 /* Need a session for kernel command */
3226 if (need_tracing_session
) {
3227 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3228 ret
= create_kernel_session(cmd_ctx
->session
);
3230 ret
= LTTCOMM_KERN_SESS_FAIL
;
3235 /* Start the kernel consumer daemon */
3236 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3237 if (kconsumer_data
.pid
== 0 &&
3238 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3239 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3240 ret
= start_consumerd(&kconsumer_data
);
3242 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3246 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3250 case LTTNG_DOMAIN_UST
:
3252 if (need_tracing_session
) {
3253 if (cmd_ctx
->session
->ust_session
== NULL
) {
3254 ret
= create_ust_session(cmd_ctx
->session
,
3255 &cmd_ctx
->lsm
->domain
);
3256 if (ret
!= LTTCOMM_OK
) {
3260 /* Start the UST consumer daemons */
3262 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3263 if (consumerd64_path
[0] != '\0' &&
3264 ustconsumer64_data
.pid
== 0 &&
3265 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3266 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3267 ret
= start_consumerd(&ustconsumer64_data
);
3269 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3270 ust_consumerd64_fd
= -EINVAL
;
3274 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3276 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3279 if (consumerd32_path
[0] != '\0' &&
3280 ustconsumer32_data
.pid
== 0 &&
3281 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3282 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3283 ret
= start_consumerd(&ustconsumer32_data
);
3285 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3286 ust_consumerd32_fd
= -EINVAL
;
3289 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3291 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3300 /* Process by command type */
3301 switch (cmd_ctx
->lsm
->cmd_type
) {
3302 case LTTNG_ADD_CONTEXT
:
3304 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3305 cmd_ctx
->lsm
->u
.context
.channel_name
,
3306 cmd_ctx
->lsm
->u
.context
.event_name
,
3307 &cmd_ctx
->lsm
->u
.context
.ctx
);
3310 case LTTNG_DISABLE_CHANNEL
:
3312 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3313 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3316 case LTTNG_DISABLE_EVENT
:
3318 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3319 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3320 cmd_ctx
->lsm
->u
.disable
.name
);
3324 case LTTNG_DISABLE_ALL_EVENT
:
3326 DBG("Disabling all events");
3328 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3329 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3332 case LTTNG_ENABLE_CHANNEL
:
3334 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3335 &cmd_ctx
->lsm
->u
.channel
.chan
);
3338 case LTTNG_ENABLE_EVENT
:
3340 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3341 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3342 &cmd_ctx
->lsm
->u
.enable
.event
);
3345 case LTTNG_ENABLE_ALL_EVENT
:
3347 DBG("Enabling all events");
3349 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3350 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3351 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3354 case LTTNG_LIST_TRACEPOINTS
:
3356 struct lttng_event
*events
;
3359 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3360 if (nb_events
< 0) {
3366 * Setup lttng message with payload size set to the event list size in
3367 * bytes and then copy list into the llm payload.
3369 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3375 /* Copy event list into message payload */
3376 memcpy(cmd_ctx
->llm
->payload
, events
,
3377 sizeof(struct lttng_event
) * nb_events
);
3384 case LTTNG_START_TRACE
:
3386 ret
= cmd_start_trace(cmd_ctx
->session
);
3389 case LTTNG_STOP_TRACE
:
3391 ret
= cmd_stop_trace(cmd_ctx
->session
);
3394 case LTTNG_CREATE_SESSION
:
3396 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3397 cmd_ctx
->lsm
->session
.path
);
3400 case LTTNG_DESTROY_SESSION
:
3402 ret
= cmd_destroy_session(cmd_ctx
->session
,
3403 cmd_ctx
->lsm
->session
.name
);
3406 case LTTNG_LIST_DOMAINS
:
3409 struct lttng_domain
*domains
;
3411 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3417 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3422 /* Copy event list into message payload */
3423 memcpy(cmd_ctx
->llm
->payload
, domains
,
3424 nb_dom
* sizeof(struct lttng_domain
));
3431 case LTTNG_LIST_CHANNELS
:
3434 struct lttng_channel
*channels
;
3436 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3437 cmd_ctx
->session
, &channels
);
3443 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3448 /* Copy event list into message payload */
3449 memcpy(cmd_ctx
->llm
->payload
, channels
,
3450 nb_chan
* sizeof(struct lttng_channel
));
3457 case LTTNG_LIST_EVENTS
:
3460 struct lttng_event
*events
= NULL
;
3462 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3463 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3469 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3474 /* Copy event list into message payload */
3475 memcpy(cmd_ctx
->llm
->payload
, events
,
3476 nb_event
* sizeof(struct lttng_event
));
3483 case LTTNG_LIST_SESSIONS
:
3485 session_lock_list();
3487 if (session_list_ptr
->count
== 0) {
3488 ret
= LTTCOMM_NO_SESSION
;
3489 session_unlock_list();
3493 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3494 session_list_ptr
->count
);
3496 session_unlock_list();
3500 /* Filled the session array */
3501 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3503 session_unlock_list();
3508 case LTTNG_CALIBRATE
:
3510 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3511 &cmd_ctx
->lsm
->u
.calibrate
);
3514 case LTTNG_REGISTER_CONSUMER
:
3516 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3517 cmd_ctx
->lsm
->u
.reg
.path
);
3526 if (cmd_ctx
->llm
== NULL
) {
3527 DBG("Missing llm structure. Allocating one.");
3528 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3532 /* Set return code */
3533 cmd_ctx
->llm
->ret_code
= ret
;
3535 if (cmd_ctx
->session
) {
3536 session_unlock(cmd_ctx
->session
);
3543 * This thread manage all clients request using the unix client socket for
3546 static void *thread_manage_clients(void *data
)
3548 int sock
= 0, ret
, i
, pollfd
;
3549 uint32_t revents
, nb_fd
;
3550 struct command_ctx
*cmd_ctx
= NULL
;
3551 struct lttng_poll_event events
;
3553 DBG("[thread] Manage client started");
3555 rcu_register_thread();
3557 ret
= lttcomm_listen_unix_sock(client_sock
);
3563 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3564 * more will be added to this poll set.
3566 ret
= create_thread_poll_set(&events
, 2);
3571 /* Add the application registration socket */
3572 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3578 * Notify parent pid that we are ready to accept command for client side.
3580 if (opt_sig_parent
) {
3581 kill(ppid
, SIGCHLD
);
3585 DBG("Accepting client command ...");
3587 nb_fd
= LTTNG_POLL_GETNB(&events
);
3589 /* Inifinite blocking call, waiting for transmission */
3590 ret
= lttng_poll_wait(&events
, -1);
3595 for (i
= 0; i
< nb_fd
; i
++) {
3596 /* Fetch once the poll data */
3597 revents
= LTTNG_POLL_GETEV(&events
, i
);
3598 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3600 /* Thread quit pipe has been closed. Killing thread. */
3601 ret
= check_thread_quit_pipe(pollfd
, revents
);
3606 /* Event on the registration socket */
3607 if (pollfd
== client_sock
) {
3608 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3609 ERR("Client socket poll error");
3615 DBG("Wait for client response");
3617 sock
= lttcomm_accept_unix_sock(client_sock
);
3622 /* Allocate context command to process the client request */
3623 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3624 if (cmd_ctx
== NULL
) {
3625 perror("zmalloc cmd_ctx");
3629 /* Allocate data buffer for reception */
3630 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3631 if (cmd_ctx
->lsm
== NULL
) {
3632 perror("zmalloc cmd_ctx->lsm");
3636 cmd_ctx
->llm
= NULL
;
3637 cmd_ctx
->session
= NULL
;
3640 * Data is received from the lttng client. The struct
3641 * lttcomm_session_msg (lsm) contains the command and data request of
3644 DBG("Receiving data from client ...");
3645 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3646 sizeof(struct lttcomm_session_msg
));
3648 DBG("Nothing recv() from client... continuing");
3654 // TODO: Validate cmd_ctx including sanity check for
3655 // security purpose.
3657 rcu_thread_online();
3659 * This function dispatch the work to the kernel or userspace tracer
3660 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3661 * informations for the client. The command context struct contains
3662 * everything this function may needs.
3664 ret
= process_client_msg(cmd_ctx
);
3665 rcu_thread_offline();
3668 * TODO: Inform client somehow of the fatal error. At
3669 * this point, ret < 0 means that a zmalloc failed
3670 * (ENOMEM). Error detected but still accept command.
3672 clean_command_ctx(&cmd_ctx
);
3676 DBG("Sending response (size: %d, retcode: %s)",
3677 cmd_ctx
->lttng_msg_size
,
3678 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3679 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3681 ERR("Failed to send data back to client");
3684 clean_command_ctx(&cmd_ctx
);
3686 /* End of transmission */
3691 DBG("Client thread dying");
3692 unlink(client_unix_sock_path
);
3696 lttng_poll_clean(&events
);
3697 clean_command_ctx(&cmd_ctx
);
3699 rcu_unregister_thread();
3705 * usage function on stderr
3707 static void usage(void)
3709 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3710 fprintf(stderr
, " -h, --help Display this usage.\n");
3711 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3712 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3713 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3714 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3715 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3716 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3717 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3718 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3719 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3720 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3721 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3722 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3723 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3724 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3725 fprintf(stderr
, " -V, --version Show version number.\n");
3726 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3727 fprintf(stderr
, " -q, --quiet No output at all.\n");
3728 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3729 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3733 * daemon argument parsing
3735 static int parse_args(int argc
, char **argv
)
3739 static struct option long_options
[] = {
3740 { "client-sock", 1, 0, 'c' },
3741 { "apps-sock", 1, 0, 'a' },
3742 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3743 { "kconsumerd-err-sock", 1, 0, 'E' },
3744 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3745 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3746 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3747 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3748 { "consumerd32-path", 1, 0, 'u' },
3749 { "consumerd32-libdir", 1, 0, 'U' },
3750 { "consumerd64-path", 1, 0, 't' },
3751 { "consumerd64-libdir", 1, 0, 'T' },
3752 { "daemonize", 0, 0, 'd' },
3753 { "sig-parent", 0, 0, 'S' },
3754 { "help", 0, 0, 'h' },
3755 { "group", 1, 0, 'g' },
3756 { "version", 0, 0, 'V' },
3757 { "quiet", 0, 0, 'q' },
3758 { "verbose", 0, 0, 'v' },
3759 { "verbose-consumer", 0, 0, 'Z' },
3764 int option_index
= 0;
3765 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3766 long_options
, &option_index
);
3773 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3775 fprintf(stderr
, " with arg %s\n", optarg
);
3779 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3782 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3788 opt_tracing_group
= optarg
;
3794 fprintf(stdout
, "%s\n", VERSION
);
3800 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3803 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3806 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3809 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3812 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3815 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3821 /* Verbose level can increase using multiple -v */
3825 opt_verbose_consumer
+= 1;
3828 consumerd32_path
= optarg
;
3831 consumerd32_libdir
= optarg
;
3834 consumerd64_path
= optarg
;
3837 consumerd64_libdir
= optarg
;
3840 /* Unknown option or other error.
3841 * Error is printed by getopt, just return */
3850 * Creates the two needed socket by the daemon.
3851 * apps_sock - The communication socket for all UST apps.
3852 * client_sock - The communication of the cli tool (lttng).
3854 static int init_daemon_socket(void)
3859 old_umask
= umask(0);
3861 /* Create client tool unix socket */
3862 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3863 if (client_sock
< 0) {
3864 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3869 /* File permission MUST be 660 */
3870 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3872 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3877 /* Create the application unix socket */
3878 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3879 if (apps_sock
< 0) {
3880 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3885 /* File permission MUST be 666 */
3886 ret
= chmod(apps_unix_sock_path
,
3887 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3889 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3900 * Check if the global socket is available, and if a daemon is answering at the
3901 * other side. If yes, error is returned.
3903 static int check_existing_daemon(void)
3905 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3906 access(apps_unix_sock_path
, F_OK
) < 0) {
3910 /* Is there anybody out there ? */
3911 if (lttng_session_daemon_alive()) {
3919 * Set the tracing group gid onto the client socket.
3921 * Race window between mkdir and chown is OK because we are going from more
3922 * permissive (root.root) to les permissive (root.tracing).
3924 static int set_permissions(void)
3929 gid
= allowed_group();
3932 WARN("No tracing group detected");
3935 ERR("Missing tracing group. Aborting execution.");
3941 /* Set lttng run dir */
3942 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3944 ERR("Unable to set group on " LTTNG_RUNDIR
);
3948 /* lttng client socket path */
3949 ret
= chown(client_unix_sock_path
, 0, gid
);
3951 ERR("Unable to set group on %s", client_unix_sock_path
);
3955 /* kconsumer error socket path */
3956 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3958 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3962 /* 64-bit ustconsumer error socket path */
3963 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3965 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3969 /* 32-bit ustconsumer compat32 error socket path */
3970 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3972 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3976 DBG("All permissions are set");
3983 * Create the pipe used to wake up the kernel thread.
3985 static int create_kernel_poll_pipe(void)
3987 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3991 * Create the application command pipe to wake thread_manage_apps.
3993 static int create_apps_cmd_pipe(void)
3995 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3999 * Create the lttng run directory needed for all global sockets and pipe.
4001 static int create_lttng_rundir(void)
4005 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
4007 if (errno
!= EEXIST
) {
4008 ERR("Unable to create " LTTNG_RUNDIR
);
4020 * Setup sockets and directory needed by the kconsumerd communication with the
4023 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
4028 switch (consumer_data
->type
) {
4029 case LTTNG_CONSUMER_KERNEL
:
4030 path
= KCONSUMERD_PATH
;
4032 case LTTNG_CONSUMER64_UST
:
4033 path
= USTCONSUMERD64_PATH
;
4035 case LTTNG_CONSUMER32_UST
:
4036 path
= USTCONSUMERD32_PATH
;
4039 ERR("Consumer type unknown");
4044 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
4046 if (errno
!= EEXIST
) {
4047 ERR("Failed to create %s", path
);
4053 /* Create the kconsumerd error unix socket */
4054 consumer_data
->err_sock
=
4055 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4056 if (consumer_data
->err_sock
< 0) {
4057 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4062 /* File permission MUST be 660 */
4063 ret
= chmod(consumer_data
->err_unix_sock_path
,
4064 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4066 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4076 * Signal handler for the daemon
4078 * Simply stop all worker threads, leaving main() return gracefully after
4079 * joining all threads and calling cleanup().
4081 static void sighandler(int sig
)
4085 DBG("SIGPIPE catched");
4088 DBG("SIGINT catched");
4092 DBG("SIGTERM catched");
4101 * Setup signal handler for :
4102 * SIGINT, SIGTERM, SIGPIPE
4104 static int set_signal_handler(void)
4107 struct sigaction sa
;
4110 if ((ret
= sigemptyset(&sigset
)) < 0) {
4111 perror("sigemptyset");
4115 sa
.sa_handler
= sighandler
;
4116 sa
.sa_mask
= sigset
;
4118 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4119 perror("sigaction");
4123 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4124 perror("sigaction");
4128 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4129 perror("sigaction");
4133 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4139 * Set open files limit to unlimited. This daemon can open a large number of
4140 * file descriptors in order to consumer multiple kernel traces.
4142 static void set_ulimit(void)
4147 /* The kernel does not allowed an infinite limit for open files */
4148 lim
.rlim_cur
= 65535;
4149 lim
.rlim_max
= 65535;
4151 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4153 perror("failed to set open files limit");
4160 int main(int argc
, char **argv
)
4164 const char *home_path
;
4166 rcu_register_thread();
4168 /* Create thread quit pipe */
4169 if ((ret
= init_thread_quit_pipe()) < 0) {
4173 setup_consumerd_path();
4175 /* Parse arguments */
4177 if ((ret
= parse_args(argc
, argv
) < 0)) {
4190 /* Check if daemon is UID = 0 */
4191 is_root
= !getuid();
4194 ret
= create_lttng_rundir();
4199 if (strlen(apps_unix_sock_path
) == 0) {
4200 snprintf(apps_unix_sock_path
, PATH_MAX
,
4201 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4204 if (strlen(client_unix_sock_path
) == 0) {
4205 snprintf(client_unix_sock_path
, PATH_MAX
,
4206 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4209 /* Set global SHM for ust */
4210 if (strlen(wait_shm_path
) == 0) {
4211 snprintf(wait_shm_path
, PATH_MAX
,
4212 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4215 home_path
= get_home_dir();
4216 if (home_path
== NULL
) {
4217 /* TODO: Add --socket PATH option */
4218 ERR("Can't get HOME directory for sockets creation.");
4223 if (strlen(apps_unix_sock_path
) == 0) {
4224 snprintf(apps_unix_sock_path
, PATH_MAX
,
4225 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4228 /* Set the cli tool unix socket path */
4229 if (strlen(client_unix_sock_path
) == 0) {
4230 snprintf(client_unix_sock_path
, PATH_MAX
,
4231 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4234 /* Set global SHM for ust */
4235 if (strlen(wait_shm_path
) == 0) {
4236 snprintf(wait_shm_path
, PATH_MAX
,
4237 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4241 DBG("Client socket path %s", client_unix_sock_path
);
4242 DBG("Application socket path %s", apps_unix_sock_path
);
4245 * See if daemon already exist.
4247 if ((ret
= check_existing_daemon()) < 0) {
4248 ERR("Already running daemon.\n");
4250 * We do not goto exit because we must not cleanup()
4251 * because a daemon is already running.
4256 /* After this point, we can safely call cleanup() with "goto exit" */
4259 * These actions must be executed as root. We do that *after* setting up
4260 * the sockets path because we MUST make the check for another daemon using
4261 * those paths *before* trying to set the kernel consumer sockets and init
4265 ret
= set_consumer_sockets(&kconsumer_data
);
4270 ret
= set_consumer_sockets(&ustconsumer64_data
);
4275 ret
= set_consumer_sockets(&ustconsumer32_data
);
4280 /* Setup kernel tracer */
4281 init_kernel_tracer();
4283 /* Set ulimit for open files */
4287 if ((ret
= set_signal_handler()) < 0) {
4291 /* Setup the needed unix socket */
4292 if ((ret
= init_daemon_socket()) < 0) {
4296 /* Set credentials to socket */
4297 if (is_root
&& ((ret
= set_permissions()) < 0)) {
4301 /* Get parent pid if -S, --sig-parent is specified. */
4302 if (opt_sig_parent
) {
4306 /* Setup the kernel pipe for waking up the kernel thread */
4307 if ((ret
= create_kernel_poll_pipe()) < 0) {
4311 /* Setup the thread apps communication pipe. */
4312 if ((ret
= create_apps_cmd_pipe()) < 0) {
4316 /* Init UST command queue. */
4317 cds_wfq_init(&ust_cmd_queue
.queue
);
4319 /* Init UST app hash table */
4323 * Get session list pointer. This pointer MUST NOT be free(). This list is
4324 * statically declared in session.c
4326 session_list_ptr
= session_get_list();
4328 /* Set up max poll set size */
4329 lttng_poll_set_max_size();
4331 /* Create thread to manage the client socket */
4332 ret
= pthread_create(&client_thread
, NULL
,
4333 thread_manage_clients
, (void *) NULL
);
4335 perror("pthread_create clients");
4339 /* Create thread to dispatch registration */
4340 ret
= pthread_create(&dispatch_thread
, NULL
,
4341 thread_dispatch_ust_registration
, (void *) NULL
);
4343 perror("pthread_create dispatch");
4347 /* Create thread to manage application registration. */
4348 ret
= pthread_create(®_apps_thread
, NULL
,
4349 thread_registration_apps
, (void *) NULL
);
4351 perror("pthread_create registration");
4355 /* Create thread to manage application socket */
4356 ret
= pthread_create(&apps_thread
, NULL
,
4357 thread_manage_apps
, (void *) NULL
);
4359 perror("pthread_create apps");
4363 /* Create kernel thread to manage kernel event */
4364 ret
= pthread_create(&kernel_thread
, NULL
,
4365 thread_manage_kernel
, (void *) NULL
);
4367 perror("pthread_create kernel");
4371 ret
= pthread_join(kernel_thread
, &status
);
4373 perror("pthread_join");
4374 goto error
; /* join error, exit without cleanup */
4378 ret
= pthread_join(apps_thread
, &status
);
4380 perror("pthread_join");
4381 goto error
; /* join error, exit without cleanup */
4385 ret
= pthread_join(reg_apps_thread
, &status
);
4387 perror("pthread_join");
4388 goto error
; /* join error, exit without cleanup */
4392 ret
= pthread_join(dispatch_thread
, &status
);
4394 perror("pthread_join");
4395 goto error
; /* join error, exit without cleanup */
4399 ret
= pthread_join(client_thread
, &status
);
4401 perror("pthread_join");
4402 goto error
; /* join error, exit without cleanup */
4405 ret
= join_consumer_thread(&kconsumer_data
);
4407 perror("join_consumer");
4408 goto error
; /* join error, exit without cleanup */
4414 * cleanup() is called when no other thread is running.
4416 rcu_thread_online();
4418 rcu_thread_offline();
4419 rcu_unregister_thread();