1 /* Copyright (C) 2009 Pierre-Marc Fournier
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <sys/types.h>
23 #include <sys/socket.h>
32 #include <ust/marker.h>
33 #include <ust/tracectl.h>
38 #include "marker-control.h"
42 #define USTSIGNAL SIGIO
44 #define MAX_MSG_SIZE (100)
46 #define MSG_REGISTER_NOTIF 2
48 char consumer_stack
[10000];
50 /* This should only be accessed by the constructor, before the creation
51 * of the listener, and then only by the listener.
55 struct list_head blocked_consumers
= LIST_HEAD_INIT(blocked_consumers
);
57 static struct ustcomm_app ustcomm_app
;
59 struct tracecmd
{ /* no padding */
64 /* volatile because shared between the listener and the main thread */
65 volatile sig_atomic_t buffers_to_export
= 0;
68 /* size: the size of all the fields except size itself */
71 /* Only the necessary part of the payload is transferred. It
72 * may even be none of it.
77 struct consumer_channel
{
79 struct ltt_channel_struct
*chan
;
82 struct blocked_consumer
{
87 /* args to ustcomm_send_reply */
88 struct ustcomm_server server
;
89 struct ustcomm_source src
;
91 /* args to ust_buffers_get_subbuf */
92 struct ust_buffer
*buf
;
94 struct list_head list
;
97 static long long make_pidunique(void)
102 gettimeofday(&tv
, NULL
);
106 retval
|= tv
.tv_usec
;
111 static void print_markers(FILE *fp
)
113 struct marker_iter iter
;
116 marker_iter_reset(&iter
);
117 marker_iter_start(&iter
);
120 fprintf(fp
, "marker: %s/%s %d \"%s\" %p\n", iter
.marker
->channel
, iter
.marker
->name
, (int)imv_read(iter
.marker
->state
), iter
.marker
->format
, iter
.marker
->location
);
121 marker_iter_next(&iter
);
126 static int init_socket(void);
128 /* This needs to be called whenever a new thread is created. It notifies
129 * liburcu of the new thread.
132 void ust_register_thread(void)
134 rcu_register_thread();
141 struct trctl_msg msg
;
143 /* FIXME: fd_notif should probably be protected by a spinlock */
148 msg
.type
= MSG_NOTIF
;
149 msg
.size
= sizeof(msg
.type
);
151 /* FIXME: don't block here */
152 result
= write(fd_notif
, &msg
, msg
.size
+sizeof(msg
.size
));
159 /* Ask the daemon to collect a trace called trace_name and being
160 * produced by this pid.
162 * The trace must be at least allocated. (It can also be started.)
163 * This is because _ltt_trace_find is used.
166 static void inform_consumer_daemon(const char *trace_name
)
169 struct ust_trace
*trace
;
170 pid_t pid
= getpid();
175 trace
= _ltt_trace_find(trace_name
);
177 WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name
);
181 for(i
=0; i
< trace
->nr_channels
; i
++) {
182 /* iterate on all cpus */
183 for(j
=0; j
<trace
->channels
[i
].n_cpus
; j
++) {
185 asprintf(&buf
, "%s_%d", trace
->channels
[i
].channel_name
, j
);
186 result
= ustcomm_request_consumer(pid
, buf
);
188 WARN("Failed to request collection for channel %s. Is the daemon available?", trace
->channels
[i
].channel_name
);
189 /* continue even if fail */
200 void process_blocked_consumers(void)
204 struct blocked_consumer
*bc
;
209 list_for_each_entry(bc
, &blocked_consumers
, list
) {
213 fds
= (struct pollfd
*) malloc(n_fds
* sizeof(struct pollfd
));
215 ERR("malloc returned NULL");
219 list_for_each_entry(bc
, &blocked_consumers
, list
) {
220 fds
[idx
].fd
= bc
->fd_producer
;
221 fds
[idx
].events
= POLLIN
;
222 bc
->tmp_poll_idx
= idx
;
226 while((result
= poll(fds
, n_fds
, 0)) == -1 && errno
== EINTR
)
233 list_for_each_entry(bc
, &blocked_consumers
, list
) {
234 if(fds
[bc
->tmp_poll_idx
].revents
) {
235 long consumed_old
= 0;
238 result
= read(bc
->fd_producer
, &inbuf
, 1);
246 close(bc
->fd_producer
);
250 result
= ustcomm_send_reply(&bc
->server
, "END", &bc
->src
);
252 ERR("ustcomm_send_reply failed");
259 result
= ust_buffers_get_subbuf(bc
->buf
, &consumed_old
);
260 if(result
== -EAGAIN
) {
261 WARN("missed buffer?");
264 else if(result
< 0) {
265 DBG("ust_buffers_get_subbuf: error: %s", strerror(-result
));
267 asprintf(&reply
, "%s %ld", "OK", consumed_old
);
268 result
= ustcomm_send_reply(&bc
->server
, reply
, &bc
->src
);
270 ERR("ustcomm_send_reply failed");
282 void seperate_channel_cpu(const char *channel_and_cpu
, char **channel
, int *cpu
)
286 sep
= rindex(channel_and_cpu
, '_');
289 sep
= channel_and_cpu
+ strlen(channel_and_cpu
);
295 asprintf(channel
, "%.*s", (int)(sep
-channel_and_cpu
), channel_and_cpu
);
298 static int do_cmd_get_shmid(const char *recvbuf
, struct ustcomm_source
*src
)
301 struct ust_trace
*trace
;
302 char trace_name
[] = "auto";
304 char *channel_and_cpu
;
312 channel_and_cpu
= nth_token(recvbuf
, 1);
313 if(channel_and_cpu
== NULL
) {
314 ERR("cannot parse channel");
318 seperate_channel_cpu(channel_and_cpu
, &ch_name
, &ch_cpu
);
320 ERR("problem parsing channel name");
321 goto free_short_chan_name
;
325 trace
= _ltt_trace_find(trace_name
);
329 ERR("cannot find trace!");
331 goto free_short_chan_name
;
334 for(i
=0; i
<trace
->nr_channels
; i
++) {
335 struct ust_channel
*channel
= &trace
->channels
[i
];
336 struct ust_buffer
*buf
= channel
->buf
[ch_cpu
];
338 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
341 // DBG("the shmid for the requested channel is %d", buf->shmid);
342 // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids);
343 asprintf(&reply
, "%d %d", buf
->shmid
, channel
->buf_struct_shmids
[ch_cpu
]);
345 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
347 ERR("ustcomm_send_reply failed");
350 goto free_short_chan_name
;
364 ERR("channel not found (%s)", channel_and_cpu
);
367 free_short_chan_name
:
374 static int do_cmd_get_n_subbufs(const char *recvbuf
, struct ustcomm_source
*src
)
377 struct ust_trace
*trace
;
378 char trace_name
[] = "auto";
380 char *channel_and_cpu
;
386 DBG("get_n_subbufs");
388 channel_and_cpu
= nth_token(recvbuf
, 1);
389 if(channel_and_cpu
== NULL
) {
390 ERR("cannot parse channel");
394 seperate_channel_cpu(channel_and_cpu
, &ch_name
, &ch_cpu
);
396 ERR("problem parsing channel name");
397 goto free_short_chan_name
;
401 trace
= _ltt_trace_find(trace_name
);
405 ERR("cannot find trace!");
407 goto free_short_chan_name
;
410 for(i
=0; i
<trace
->nr_channels
; i
++) {
411 struct ust_channel
*channel
= &trace
->channels
[i
];
413 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
416 DBG("the n_subbufs for the requested channel is %d", channel
->subbuf_cnt
);
417 asprintf(&reply
, "%d", channel
->subbuf_cnt
);
419 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
421 ERR("ustcomm_send_reply failed");
424 goto free_short_chan_name
;
433 ERR("unable to find channel");
436 free_short_chan_name
:
443 static int do_cmd_get_subbuf_size(const char *recvbuf
, struct ustcomm_source
*src
)
446 struct ust_trace
*trace
;
447 char trace_name
[] = "auto";
449 char *channel_and_cpu
;
455 DBG("get_subbuf_size");
457 channel_and_cpu
= nth_token(recvbuf
, 1);
458 if(channel_and_cpu
== NULL
) {
459 ERR("cannot parse channel");
463 seperate_channel_cpu(channel_and_cpu
, &ch_name
, &ch_cpu
);
465 ERR("problem parsing channel name");
466 goto free_short_chan_name
;
470 trace
= _ltt_trace_find(trace_name
);
474 ERR("cannot find trace!");
476 goto free_short_chan_name
;
479 for(i
=0; i
<trace
->nr_channels
; i
++) {
480 struct ust_channel
*channel
= &trace
->channels
[i
];
482 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
485 DBG("the subbuf_size for the requested channel is %zd", channel
->subbuf_size
);
486 asprintf(&reply
, "%zd", channel
->subbuf_size
);
488 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
490 ERR("ustcomm_send_reply failed");
493 goto free_short_chan_name
;
502 ERR("unable to find channel");
505 free_short_chan_name
:
512 unsigned int poweroftwo(unsigned int x
)
514 unsigned int power2
= 1;
515 unsigned int hardcoded
= 2147483648; /* FIX max 2^31 */
520 while (power2
< x
&& power2
< hardcoded
)
526 static int do_cmd_set_subbuf_size(const char *recvbuf
, struct ustcomm_source
*src
)
528 char *channel_slash_size
;
529 char ch_name
[256]="";
530 unsigned int size
, power
;
532 struct ust_trace
*trace
;
533 char trace_name
[] = "auto";
537 DBG("set_subbuf_size");
539 channel_slash_size
= nth_token(recvbuf
, 1);
540 sscanf(channel_slash_size
, "%255[^/]/%u", ch_name
, &size
);
542 if(ch_name
== NULL
) {
543 ERR("cannot parse channel");
547 power
= poweroftwo(size
);
549 WARN("using the next 2^n = %u\n", power
);
552 trace
= _ltt_trace_find_setup(trace_name
);
554 ERR("cannot find trace!");
560 for(i
= 0; i
< trace
->nr_channels
; i
++) {
561 struct ust_channel
*channel
= &trace
->channels
[i
];
563 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
565 channel
->subbuf_size
= power
;
566 DBG("the set_subbuf_size for the requested channel is %zd", channel
->subbuf_size
);
573 ERR("unable to find channel");
582 static int do_cmd_set_subbuf_num(const char *recvbuf
, struct ustcomm_source
*src
)
584 char *channel_slash_num
;
585 char ch_name
[256]="";
588 struct ust_trace
*trace
;
589 char trace_name
[] = "auto";
593 DBG("set_subbuf_num");
595 channel_slash_num
= nth_token(recvbuf
, 1);
596 sscanf(channel_slash_num
, "%255[^/]/%u", ch_name
, &num
);
598 if(ch_name
== NULL
) {
599 ERR("cannot parse channel");
603 ERR("subbuffer count should be greater than 2");
608 trace
= _ltt_trace_find_setup(trace_name
);
610 ERR("cannot find trace!");
616 for(i
= 0; i
< trace
->nr_channels
; i
++) {
617 struct ust_channel
*channel
= &trace
->channels
[i
];
619 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
621 channel
->subbuf_cnt
= num
;
622 DBG("the set_subbuf_cnt for the requested channel is %zd", channel
->subbuf_cnt
);
629 ERR("unable to find channel");
638 static int do_cmd_get_subbuffer(const char *recvbuf
, struct ustcomm_source
*src
)
641 struct ust_trace
*trace
;
642 char trace_name
[] = "auto";
644 char *channel_and_cpu
;
651 channel_and_cpu
= nth_token(recvbuf
, 1);
652 if(channel_and_cpu
== NULL
) {
653 ERR("cannot parse channel");
657 seperate_channel_cpu(channel_and_cpu
, &ch_name
, &ch_cpu
);
659 ERR("problem parsing channel name");
660 goto free_short_chan_name
;
664 trace
= _ltt_trace_find(trace_name
);
671 WARN("Cannot find trace. It was likely destroyed by the user.");
672 asprintf(&reply
, "%s", "NOTFOUND");
673 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
675 ERR("ustcomm_send_reply failed");
678 goto free_short_chan_name
;
682 goto free_short_chan_name
;
685 for(i
=0; i
<trace
->nr_channels
; i
++) {
686 struct ust_channel
*channel
= &trace
->channels
[i
];
688 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
689 struct ust_buffer
*buf
= channel
->buf
[ch_cpu
];
690 struct blocked_consumer
*bc
;
694 bc
= (struct blocked_consumer
*) malloc(sizeof(struct blocked_consumer
));
696 ERR("malloc returned NULL");
697 goto free_short_chan_name
;
699 bc
->fd_consumer
= src
->fd
;
700 bc
->fd_producer
= buf
->data_ready_fd_read
;
703 bc
->server
= ustcomm_app
.server
;
705 list_add(&bc
->list
, &blocked_consumers
);
711 ERR("unable to find channel");
714 free_short_chan_name
:
721 static int do_cmd_put_subbuffer(const char *recvbuf
, struct ustcomm_source
*src
)
724 struct ust_trace
*trace
;
725 char trace_name
[] = "auto";
727 char *channel_and_cpu
;
733 char *consumed_old_str
;
739 channel_and_cpu
= strdup_malloc(nth_token(recvbuf
, 1));
740 if(channel_and_cpu
== NULL
) {
741 ERR("cannot parse channel");
746 consumed_old_str
= strdup_malloc(nth_token(recvbuf
, 2));
747 if(consumed_old_str
== NULL
) {
748 ERR("cannot parse consumed_old");
750 goto free_channel_and_cpu
;
752 consumed_old
= strtol(consumed_old_str
, &endptr
, 10);
753 if(*endptr
!= '\0') {
754 ERR("invalid value for consumed_old");
756 goto free_consumed_old_str
;
759 seperate_channel_cpu(channel_and_cpu
, &ch_name
, &ch_cpu
);
761 ERR("problem parsing channel name");
763 goto free_short_chan_name
;
767 trace
= _ltt_trace_find(trace_name
);
771 WARN("Cannot find trace. It was likely destroyed by the user.");
772 asprintf(&reply
, "%s", "NOTFOUND");
773 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
775 ERR("ustcomm_send_reply failed");
778 goto free_short_chan_name
;
782 goto free_short_chan_name
;
785 for(i
=0; i
<trace
->nr_channels
; i
++) {
786 struct ust_channel
*channel
= &trace
->channels
[i
];
788 if(!strcmp(trace
->channels
[i
].channel_name
, ch_name
)) {
789 struct ust_buffer
*buf
= channel
->buf
[ch_cpu
];
793 result
= ust_buffers_put_subbuf(buf
, consumed_old
);
795 WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu
);
796 asprintf(&reply
, "%s", "ERROR");
799 DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu
);
800 asprintf(&reply
, "%s", "OK");
803 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, src
);
805 ERR("ustcomm_send_reply failed");
808 goto free_channel_and_cpu
;
816 ERR("unable to find channel");
819 free_short_chan_name
:
821 free_consumed_old_str
:
822 free(consumed_old_str
);
823 free_channel_and_cpu
:
824 free(channel_and_cpu
);
830 void *listener_main(void *p
)
834 ust_register_thread();
839 char trace_name
[] = "auto";
840 char trace_type
[] = "ustrelay";
843 struct ustcomm_source src
;
845 process_blocked_consumers();
847 result
= ustcomm_app_recv_message(&ustcomm_app
, &recvbuf
, &src
, 5);
849 WARN("error in ustcomm_app_recv_message");
852 else if(result
== 0) {
857 DBG("received a message! it's: %s", recvbuf
);
858 len
= strlen(recvbuf
);
860 if(!strcmp(recvbuf
, "print_markers")) {
861 print_markers(stderr
);
863 else if(!strcmp(recvbuf
, "list_markers")) {
868 fp
= open_memstream(&ptr
, &size
);
872 result
= ustcomm_send_reply(&ustcomm_app
.server
, ptr
, &src
);
876 else if(!strcmp(recvbuf
, "start")) {
877 /* start is an operation that setups the trace, allocates it and starts it */
878 result
= ltt_trace_setup(trace_name
);
880 ERR("ltt_trace_setup failed");
884 result
= ltt_trace_set_type(trace_name
, trace_type
);
886 ERR("ltt_trace_set_type failed");
890 result
= ltt_trace_alloc(trace_name
);
892 ERR("ltt_trace_alloc failed");
896 inform_consumer_daemon(trace_name
);
898 result
= ltt_trace_start(trace_name
);
900 ERR("ltt_trace_start failed");
904 else if(!strcmp(recvbuf
, "trace_setup")) {
907 result
= ltt_trace_setup(trace_name
);
909 ERR("ltt_trace_setup failed");
913 result
= ltt_trace_set_type(trace_name
, trace_type
);
915 ERR("ltt_trace_set_type failed");
919 else if(!strcmp(recvbuf
, "trace_alloc")) {
922 result
= ltt_trace_alloc(trace_name
);
924 ERR("ltt_trace_alloc failed");
927 inform_consumer_daemon(trace_name
);
929 else if(!strcmp(recvbuf
, "trace_create")) {
932 result
= ltt_trace_setup(trace_name
);
934 ERR("ltt_trace_setup failed");
938 result
= ltt_trace_set_type(trace_name
, trace_type
);
940 ERR("ltt_trace_set_type failed");
944 else if(!strcmp(recvbuf
, "trace_start")) {
947 result
= ltt_trace_alloc(trace_name
);
949 ERR("ltt_trace_alloc failed");
953 inform_consumer_daemon(trace_name
);
956 result
= ltt_trace_start(trace_name
);
958 ERR("ltt_trace_start failed");
962 else if(!strcmp(recvbuf
, "trace_stop")) {
965 result
= ltt_trace_stop(trace_name
);
967 ERR("ltt_trace_stop failed");
971 else if(!strcmp(recvbuf
, "trace_destroy")) {
973 DBG("trace destroy");
975 result
= ltt_trace_destroy(trace_name
);
977 ERR("ltt_trace_destroy failed");
981 else if(nth_token_is(recvbuf
, "get_shmid", 0) == 1) {
982 do_cmd_get_shmid(recvbuf
, &src
);
984 else if(nth_token_is(recvbuf
, "get_n_subbufs", 0) == 1) {
985 do_cmd_get_n_subbufs(recvbuf
, &src
);
987 else if(nth_token_is(recvbuf
, "get_subbuf_size", 0) == 1) {
988 do_cmd_get_subbuf_size(recvbuf
, &src
);
990 else if(nth_token_is(recvbuf
, "load_probe_lib", 0) == 1) {
993 libfile
= nth_token(recvbuf
, 1);
995 DBG("load_probe_lib loading %s", libfile
);
999 else if(nth_token_is(recvbuf
, "get_subbuffer", 0) == 1) {
1000 do_cmd_get_subbuffer(recvbuf
, &src
);
1002 else if(nth_token_is(recvbuf
, "put_subbuffer", 0) == 1) {
1003 do_cmd_put_subbuffer(recvbuf
, &src
);
1005 else if(nth_token_is(recvbuf
, "set_subbuf_size", 0) == 1) {
1006 do_cmd_set_subbuf_size(recvbuf
, &src
);
1008 else if(nth_token_is(recvbuf
, "set_subbuf_num", 0) == 1) {
1009 do_cmd_set_subbuf_num(recvbuf
, &src
);
1011 else if(nth_token_is(recvbuf
, "enable_marker", 0) == 1) {
1012 char *channel_slash_name
= nth_token(recvbuf
, 1);
1013 char channel_name
[256]="";
1014 char marker_name
[256]="";
1016 result
= sscanf(channel_slash_name
, "%255[^/]/%255s", channel_name
, marker_name
);
1018 if(channel_name
== NULL
|| marker_name
== NULL
) {
1019 WARN("invalid marker name");
1023 result
= ltt_marker_connect(channel_name
, marker_name
, "default");
1025 WARN("could not enable marker; channel=%s, name=%s", channel_name
, marker_name
);
1028 else if(nth_token_is(recvbuf
, "disable_marker", 0) == 1) {
1029 char *channel_slash_name
= nth_token(recvbuf
, 1);
1033 result
= sscanf(channel_slash_name
, "%a[^/]/%as", &channel_name
, &marker_name
);
1035 if(marker_name
== NULL
) {
1038 result
= ltt_marker_disconnect(channel_name
, marker_name
, "default");
1040 WARN("could not disable marker; channel=%s, name=%s", channel_name
, marker_name
);
1043 else if(nth_token_is(recvbuf
, "get_pidunique", 0) == 1) {
1046 asprintf(&reply
, "%lld", pidunique
);
1048 result
= ustcomm_send_reply(&ustcomm_app
.server
, reply
, &src
);
1050 ERR("listener: get_pidunique: ustcomm_send_reply failed");
1056 // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
1057 // struct ust_trace *trace;
1058 // char trace_name[] = "auto";
1060 // char *channel_name;
1062 // DBG("get_notifications");
1064 // channel_name = strdup_malloc(nth_token(recvbuf, 1));
1065 // if(channel_name == NULL) {
1066 // ERR("put_subbuf_size: cannot parse channel");
1070 // ltt_lock_traces();
1071 // trace = _ltt_trace_find(trace_name);
1072 // ltt_unlock_traces();
1074 // if(trace == NULL) {
1075 // ERR("cannot find trace!");
1076 // return (void *)1;
1079 // for(i=0; i<trace->nr_channels; i++) {
1080 // struct rchan *rchan = trace->channels[i].trans_channel_data;
1083 // if(!strcmp(trace->channels[i].channel_name, channel_name)) {
1084 // struct rchan_buf *rbuf = rchan->buf;
1085 // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
1087 // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
1088 // if(result == -1) {
1089 // ERR("ustcomm_app_detach_client failed");
1093 // lttbuf->wake_consumer_arg = (void *) fd;
1097 // lttbuf->call_wake_consumer = 1;
1103 // free(channel_name);
1106 ERR("unable to parse message: %s", recvbuf
);
1114 volatile sig_atomic_t have_listener
= 0;
1116 void create_listener(void)
1119 static char listener_stack
[16384];
1126 WARN("not creating listener because we already had one");
1131 result
= clone((int (*)(void *)) listener_main
, listener_stack
+sizeof(listener_stack
)-1, CLONE_FS
| CLONE_FILES
| CLONE_VM
| CLONE_SIGHAND
| CLONE_THREAD
, NULL
);
1138 pthread_create(&thread
, NULL
, listener_main
, NULL
);
1144 static int init_socket(void)
1146 return ustcomm_init_app(getpid(), &ustcomm_app
);
1149 #define AUTOPROBE_DISABLED 0
1150 #define AUTOPROBE_ENABLE_ALL 1
1151 #define AUTOPROBE_ENABLE_REGEX 2
1152 static int autoprobe_method
= AUTOPROBE_DISABLED
;
1153 static regex_t autoprobe_regex
;
1155 static void auto_probe_connect(struct marker
*m
)
1159 char* concat_name
= NULL
;
1160 const char *probe_name
= "default";
1162 if(autoprobe_method
== AUTOPROBE_DISABLED
) {
1165 else if(autoprobe_method
== AUTOPROBE_ENABLE_REGEX
) {
1166 result
= asprintf(&concat_name
, "%s/%s", m
->channel
, m
->name
);
1168 ERR("auto_probe_connect: asprintf failed (marker %s/%s)",
1169 m
->channel
, m
->name
);
1172 if (regexec(&autoprobe_regex
, concat_name
, 0, NULL
, 0)) {
1179 result
= ltt_marker_connect(m
->channel
, m
->name
, probe_name
);
1180 if(result
&& result
!= -EEXIST
)
1181 ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m
->channel
, m
->name
, -result
);
1183 DBG("auto connected marker %s (addr: %p) %s to probe default", m
->channel
, m
, m
->name
);
1187 static void __attribute__((constructor
)) init()
1190 char* autoprobe_val
= NULL
;
1192 /* Assign the pidunique, to be able to differentiate the processes with same
1193 * pid, (before and after an exec).
1195 pidunique
= make_pidunique();
1197 /* Initialize RCU in case the constructor order is not good. */
1200 /* It is important to do this before events start to be generated. */
1201 ust_register_thread();
1203 DBG("Tracectl constructor");
1205 /* Must create socket before signal handler to prevent races.
1207 result
= init_socket();
1209 ERR("init_socket error");
1215 autoprobe_val
= getenv("UST_AUTOPROBE");
1217 struct marker_iter iter
;
1219 DBG("Autoprobe enabled.");
1221 /* Ensure markers are initialized */
1224 /* Ensure marker control is initialized, for the probe */
1225 init_marker_control();
1227 /* first, set the callback that will connect the
1228 * probe on new markers
1230 if(autoprobe_val
[0] == '/') {
1231 result
= regcomp(&autoprobe_regex
, autoprobe_val
+1, 0);
1235 regerror(result
, &autoprobe_regex
, regexerr
, sizeof(regexerr
));
1236 ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val
, regexerr
);
1237 /* don't crash the application just for this */
1240 autoprobe_method
= AUTOPROBE_ENABLE_REGEX
;
1244 /* just enable all instrumentation */
1245 autoprobe_method
= AUTOPROBE_ENABLE_ALL
;
1248 marker_set_new_marker_cb(auto_probe_connect
);
1250 /* Now, connect the probes that were already registered. */
1251 marker_iter_reset(&iter
);
1252 marker_iter_start(&iter
);
1254 DBG("now iterating on markers already registered");
1255 while(iter
.marker
) {
1256 DBG("now iterating on marker %s", iter
.marker
->name
);
1257 auto_probe_connect(iter
.marker
);
1258 marker_iter_next(&iter
);
1262 if(getenv("UST_TRACE")) {
1263 char trace_name
[] = "auto";
1264 char trace_type
[] = "ustrelay";
1266 DBG("starting early tracing");
1268 /* Ensure marker control is initialized */
1269 init_marker_control();
1271 /* Ensure markers are initialized */
1274 /* Ensure buffers are initialized, for the transport to be available.
1275 * We are about to set a trace type and it will fail without this.
1277 init_ustrelay_transport();
1279 /* FIXME: When starting early tracing (here), depending on the
1280 * order of constructors, it is very well possible some marker
1281 * sections are not yet registered. Because of this, some
1282 * channels may not be registered. Yet, we are about to ask the
1283 * daemon to collect the channels. Channels which are not yet
1284 * registered will not be collected.
1286 * Currently, in LTTng, there is no way to add a channel after
1287 * trace start. The reason for this is that it induces complex
1288 * concurrency issues on the trace structures, which can only
1289 * be resolved using RCU. This has not been done yet. As a
1290 * workaround, we are forcing the registration of the "ust"
1291 * channel here. This is the only channel (apart from metadata)
1292 * that can be reliably used in early tracing.
1294 * Non-early tracing does not have this problem and can use
1295 * arbitrary channel names.
1297 ltt_channels_register("ust");
1299 result
= ltt_trace_setup(trace_name
);
1301 ERR("ltt_trace_setup failed");
1305 result
= ltt_trace_set_type(trace_name
, trace_type
);
1307 ERR("ltt_trace_set_type failed");
1311 result
= ltt_trace_alloc(trace_name
);
1313 ERR("ltt_trace_alloc failed");
1317 result
= ltt_trace_start(trace_name
);
1319 ERR("ltt_trace_start failed");
1323 /* Do this after the trace is started in order to avoid creating confusion
1324 * if the trace fails to start. */
1325 inform_consumer_daemon(trace_name
);
1331 /* should decrementally destroy stuff if error */
1335 /* This is only called if we terminate normally, not with an unhandled signal,
1336 * so we cannot rely on it. However, for now, LTTV requires that the header of
1337 * the last sub-buffer contain a valid end time for the trace. This is done
1338 * automatically only when the trace is properly stopped.
1340 * If the traced program crashed, it is always possible to manually add the
1341 * right value in the header, or to open the trace in text mode.
1343 * FIXME: Fix LTTV so it doesn't need this.
1346 static void destroy_traces(void)
1350 /* if trace running, finish it */
1352 DBG("destructor stopping traces");
1354 result
= ltt_trace_stop("auto");
1356 ERR("ltt_trace_stop error");
1359 result
= ltt_trace_destroy("auto");
1361 ERR("ltt_trace_destroy error");
1365 static int trace_recording(void)
1368 struct ust_trace
*trace
;
1372 list_for_each_entry(trace
, <t_traces
.head
, list
) {
1379 ltt_unlock_traces();
1385 static int have_consumer(void)
1387 return !list_empty(&blocked_consumers
);
1391 int restarting_usleep(useconds_t usecs
)
1397 tv
.tv_nsec
= usecs
* 1000;
1400 result
= nanosleep(&tv
, &tv
);
1401 } while(result
== -1 && errno
== EINTR
);
1406 /* This destructor keeps the process alive for a few seconds in order
1407 * to leave time to ustd to connect to its buffers. This is necessary
1408 * for programs whose execution is very short. It is also useful in all
1409 * programs when tracing is started close to the end of the program
1412 * FIXME: For now, this only works for the first trace created in a
1416 static void __attribute__((destructor
)) keepalive()
1418 if(trace_recording() && buffers_to_export
) {
1420 DBG("Keeping process alive for consumer daemon...");
1421 while(buffers_to_export
) {
1422 const int interv
= 200000;
1423 restarting_usleep(interv
);
1426 if(total
>= 3000000) {
1427 WARN("non-consumed buffers remaining after wait limit; not waiting anymore");
1431 DBG("Finally dying...");
1436 ustcomm_fini_app(&ustcomm_app
);
1439 void ust_potential_exec(void)
1441 trace_mark(ust
, potential_exec
, MARK_NOARGS
);
1448 /* Notify ust that there was a fork. This needs to be called inside
1449 * the new process, anytime a process whose memory is not shared with
1450 * the parent is created. If this function is not called, the events
1451 * of the new process will not be collected.
1453 * Signals should be disabled before the fork and reenabled only after
1454 * this call in order to guarantee tracing is not started before ust_fork()
1455 * sanitizes the new process.
1458 static void ust_fork(void)
1460 struct blocked_consumer
*bc
;
1461 struct blocked_consumer
*deletable_bc
= NULL
;
1464 DBG("ust: forking");
1465 ltt_trace_stop("auto");
1466 ltt_trace_destroy("auto");
1467 /* Delete all active connections */
1468 ustcomm_close_all_connections(&ustcomm_app
.server
);
1470 /* Delete all blocked consumers */
1471 list_for_each_entry(bc
, &blocked_consumers
, list
) {
1472 close(bc
->fd_producer
);
1473 close(bc
->fd_consumer
);
1476 list_del(&bc
->list
);
1482 ltt_trace_setup("auto");
1483 result
= ltt_trace_set_type("auto", "ustrelay");
1485 ERR("ltt_trace_set_type failed");
1489 ltt_trace_alloc("auto");
1490 ltt_trace_start("auto");
1491 inform_consumer_daemon("auto");
1494 void ust_before_fork(ust_fork_info_t
*fork_info
)
1496 /* Disable signals. This is to avoid that the child
1497 * intervenes before it is properly setup for tracing. It is
1498 * safer to disable all signals, because then we know we are not
1499 * breaking anything by restoring the original mask.
1505 - only do this if tracing is active
1508 /* Disable signals */
1509 sigfillset(&all_sigs
);
1510 result
= sigprocmask(SIG_BLOCK
, &all_sigs
, &fork_info
->orig_sigs
);
1512 PERROR("sigprocmask");
1517 /* Don't call this function directly in a traced program */
1518 static void ust_after_fork_common(ust_fork_info_t
*fork_info
)
1522 /* Restore signals */
1523 result
= sigprocmask(SIG_SETMASK
, &fork_info
->orig_sigs
, NULL
);
1525 PERROR("sigprocmask");
1530 void ust_after_fork_parent(ust_fork_info_t
*fork_info
)
1532 /* Reenable signals */
1533 ust_after_fork_common(fork_info
);
1536 void ust_after_fork_child(ust_fork_info_t
*fork_info
)
1538 /* First sanitize the child */
1541 /* Then reenable interrupts */
1542 ust_after_fork_common(fork_info
);