2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License only.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <lttng/ust-ctl.h>
22 #include <lttng/ust-abi.h>
23 #include <lttng/ust-events.h>
27 #include <usterr-signal-safe.h>
31 #include "../libringbuffer/backend.h"
32 #include "../libringbuffer/frontend.h"
33 #include "../liblttng-ust/wait.h"
34 #include "../liblttng-ust/lttng-rb-clients.h"
37 * Number of milliseconds to retry before failing metadata writes on
38 * buffer full condition. (10 seconds)
40 #define LTTNG_METADATA_TIMEOUT_MSEC 10000
43 * Channel representation within consumer.
45 struct ustctl_consumer_channel
{
46 struct lttng_channel
*chan
; /* lttng channel buffers */
48 /* initial attributes */
49 struct ustctl_consumer_channel_attr attr
;
50 int wait_fd
; /* monitor close() */
51 int wakeup_fd
; /* monitor close() */
55 * Stream representation within consumer.
57 struct ustctl_consumer_stream
{
58 struct lttng_ust_shm_handle
*handle
; /* shared-memory handle */
59 struct lttng_ust_lib_ring_buffer
*buf
;
60 struct ustctl_consumer_channel
*chan
;
61 int shm_fd
, wait_fd
, wakeup_fd
;
63 uint64_t memory_map_size
;
66 extern void lttng_ring_buffer_client_overwrite_init(void);
67 extern void lttng_ring_buffer_client_overwrite_rt_init(void);
68 extern void lttng_ring_buffer_client_discard_init(void);
69 extern void lttng_ring_buffer_client_discard_rt_init(void);
70 extern void lttng_ring_buffer_metadata_client_init(void);
71 extern void lttng_ring_buffer_client_overwrite_exit(void);
72 extern void lttng_ring_buffer_client_overwrite_rt_exit(void);
73 extern void lttng_ring_buffer_client_discard_exit(void);
74 extern void lttng_ring_buffer_client_discard_rt_exit(void);
75 extern void lttng_ring_buffer_metadata_client_exit(void);
77 volatile enum ust_loglevel ust_loglevel
;
79 int ustctl_release_handle(int sock
, int handle
)
81 struct ustcomm_ust_msg lum
;
82 struct ustcomm_ust_reply lur
;
84 if (sock
< 0 || handle
< 0)
86 memset(&lum
, 0, sizeof(lum
));
88 lum
.cmd
= LTTNG_UST_RELEASE
;
89 return ustcomm_send_app_cmd(sock
, &lum
, &lur
);
93 * If sock is negative, it means we don't have to notify the other side
94 * (e.g. application has already vanished).
96 int ustctl_release_object(int sock
, struct lttng_ust_object_data
*data
)
103 switch (data
->type
) {
104 case LTTNG_UST_OBJECT_TYPE_CHANNEL
:
105 if (data
->u
.channel
.wakeup_fd
>= 0) {
106 ret
= close(data
->u
.channel
.wakeup_fd
);
112 free(data
->u
.channel
.data
);
114 case LTTNG_UST_OBJECT_TYPE_STREAM
:
115 if (data
->u
.stream
.shm_fd
>= 0) {
116 ret
= close(data
->u
.stream
.shm_fd
);
122 if (data
->u
.stream
.wakeup_fd
>= 0) {
123 ret
= close(data
->u
.stream
.wakeup_fd
);
130 case LTTNG_UST_OBJECT_TYPE_EVENT
:
131 case LTTNG_UST_OBJECT_TYPE_CONTEXT
:
136 return ustctl_release_handle(sock
, data
->handle
);
140 * Send registration done packet to the application.
142 int ustctl_register_done(int sock
)
144 struct ustcomm_ust_msg lum
;
145 struct ustcomm_ust_reply lur
;
148 DBG("Sending register done command to %d", sock
);
149 memset(&lum
, 0, sizeof(lum
));
150 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
151 lum
.cmd
= LTTNG_UST_REGISTER_DONE
;
152 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
159 * returns session handle.
161 int ustctl_create_session(int sock
)
163 struct ustcomm_ust_msg lum
;
164 struct ustcomm_ust_reply lur
;
165 int ret
, session_handle
;
168 memset(&lum
, 0, sizeof(lum
));
169 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
170 lum
.cmd
= LTTNG_UST_SESSION
;
171 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
174 session_handle
= lur
.ret_val
;
175 DBG("received session handle %u", session_handle
);
176 return session_handle
;
179 int ustctl_create_event(int sock
, struct lttng_ust_event
*ev
,
180 struct lttng_ust_object_data
*channel_data
,
181 struct lttng_ust_object_data
**_event_data
)
183 struct ustcomm_ust_msg lum
;
184 struct ustcomm_ust_reply lur
;
185 struct lttng_ust_object_data
*event_data
;
188 if (!channel_data
|| !_event_data
)
191 event_data
= zmalloc(sizeof(*event_data
));
194 event_data
->type
= LTTNG_UST_OBJECT_TYPE_EVENT
;
195 memset(&lum
, 0, sizeof(lum
));
196 lum
.handle
= channel_data
->handle
;
197 lum
.cmd
= LTTNG_UST_EVENT
;
198 strncpy(lum
.u
.event
.name
, ev
->name
,
199 LTTNG_UST_SYM_NAME_LEN
);
200 lum
.u
.event
.instrumentation
= ev
->instrumentation
;
201 lum
.u
.event
.loglevel_type
= ev
->loglevel_type
;
202 lum
.u
.event
.loglevel
= ev
->loglevel
;
203 lum
.u
.event
.disabled
= ev
->disabled
;
204 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
209 event_data
->handle
= lur
.ret_val
;
210 DBG("received event handle %u", event_data
->handle
);
211 *_event_data
= event_data
;
215 int ustctl_add_context(int sock
, struct lttng_ust_context
*ctx
,
216 struct lttng_ust_object_data
*obj_data
,
217 struct lttng_ust_object_data
**_context_data
)
219 struct ustcomm_ust_msg lum
;
220 struct ustcomm_ust_reply lur
;
221 struct lttng_ust_object_data
*context_data
;
224 if (!obj_data
|| !_context_data
)
227 context_data
= zmalloc(sizeof(*context_data
));
230 context_data
->type
= LTTNG_UST_OBJECT_TYPE_CONTEXT
;
231 memset(&lum
, 0, sizeof(lum
));
232 lum
.handle
= obj_data
->handle
;
233 lum
.cmd
= LTTNG_UST_CONTEXT
;
234 lum
.u
.context
= *ctx
;
235 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
240 context_data
->handle
= -1;
241 DBG("Context created successfully");
242 *_context_data
= context_data
;
246 int ustctl_set_filter(int sock
, struct lttng_ust_filter_bytecode
*bytecode
,
247 struct lttng_ust_object_data
*obj_data
)
249 struct ustcomm_ust_msg lum
;
250 struct ustcomm_ust_reply lur
;
256 memset(&lum
, 0, sizeof(lum
));
257 lum
.handle
= obj_data
->handle
;
258 lum
.cmd
= LTTNG_UST_FILTER
;
259 lum
.u
.filter
.data_size
= bytecode
->len
;
260 lum
.u
.filter
.reloc_offset
= bytecode
->reloc_offset
;
261 lum
.u
.filter
.seqnum
= bytecode
->seqnum
;
263 ret
= ustcomm_send_app_msg(sock
, &lum
);
266 /* send var len bytecode */
267 ret
= ustcomm_send_unix_sock(sock
, bytecode
->data
,
272 if (ret
!= bytecode
->len
)
274 return ustcomm_recv_app_reply(sock
, &lur
, lum
.handle
, lum
.cmd
);
277 int ustctl_set_exclusion(int sock
, struct lttng_ust_event_exclusion
*exclusion
,
278 struct lttng_ust_object_data
*obj_data
)
280 struct ustcomm_ust_msg lum
;
281 struct ustcomm_ust_reply lur
;
288 memset(&lum
, 0, sizeof(lum
));
289 lum
.handle
= obj_data
->handle
;
290 lum
.cmd
= LTTNG_UST_EXCLUSION
;
291 lum
.u
.exclusion
.count
= exclusion
->count
;
293 ret
= ustcomm_send_app_msg(sock
, &lum
);
298 /* send var len exclusion names */
299 ret
= ustcomm_send_unix_sock(sock
,
301 exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
);
305 if (ret
!= exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) {
308 return ustcomm_recv_app_reply(sock
, &lur
, lum
.handle
, lum
.cmd
);
311 /* Enable event, channel and session ioctl */
312 int ustctl_enable(int sock
, struct lttng_ust_object_data
*object
)
314 struct ustcomm_ust_msg lum
;
315 struct ustcomm_ust_reply lur
;
321 memset(&lum
, 0, sizeof(lum
));
322 lum
.handle
= object
->handle
;
323 lum
.cmd
= LTTNG_UST_ENABLE
;
324 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
327 DBG("enabled handle %u", object
->handle
);
331 /* Disable event, channel and session ioctl */
332 int ustctl_disable(int sock
, struct lttng_ust_object_data
*object
)
334 struct ustcomm_ust_msg lum
;
335 struct ustcomm_ust_reply lur
;
341 memset(&lum
, 0, sizeof(lum
));
342 lum
.handle
= object
->handle
;
343 lum
.cmd
= LTTNG_UST_DISABLE
;
344 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
347 DBG("disable handle %u", object
->handle
);
351 int ustctl_start_session(int sock
, int handle
)
353 struct lttng_ust_object_data obj
;
356 return ustctl_enable(sock
, &obj
);
359 int ustctl_stop_session(int sock
, int handle
)
361 struct lttng_ust_object_data obj
;
364 return ustctl_disable(sock
, &obj
);
367 int ustctl_tracepoint_list(int sock
)
369 struct ustcomm_ust_msg lum
;
370 struct ustcomm_ust_reply lur
;
371 int ret
, tp_list_handle
;
373 memset(&lum
, 0, sizeof(lum
));
374 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
375 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST
;
376 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
379 tp_list_handle
= lur
.ret_val
;
380 DBG("received tracepoint list handle %u", tp_list_handle
);
381 return tp_list_handle
;
384 int ustctl_tracepoint_list_get(int sock
, int tp_list_handle
,
385 struct lttng_ust_tracepoint_iter
*iter
)
387 struct ustcomm_ust_msg lum
;
388 struct ustcomm_ust_reply lur
;
394 memset(&lum
, 0, sizeof(lum
));
395 lum
.handle
= tp_list_handle
;
396 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST_GET
;
397 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
400 DBG("received tracepoint list entry name %s loglevel %d",
401 lur
.u
.tracepoint
.name
,
402 lur
.u
.tracepoint
.loglevel
);
403 memcpy(iter
, &lur
.u
.tracepoint
, sizeof(*iter
));
407 int ustctl_tracepoint_field_list(int sock
)
409 struct ustcomm_ust_msg lum
;
410 struct ustcomm_ust_reply lur
;
411 int ret
, tp_field_list_handle
;
413 memset(&lum
, 0, sizeof(lum
));
414 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
415 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST
;
416 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
419 tp_field_list_handle
= lur
.ret_val
;
420 DBG("received tracepoint field list handle %u", tp_field_list_handle
);
421 return tp_field_list_handle
;
424 int ustctl_tracepoint_field_list_get(int sock
, int tp_field_list_handle
,
425 struct lttng_ust_field_iter
*iter
)
427 struct ustcomm_ust_msg lum
;
428 struct ustcomm_ust_reply lur
;
435 memset(&lum
, 0, sizeof(lum
));
436 lum
.handle
= tp_field_list_handle
;
437 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST_GET
;
438 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
441 len
= ustcomm_recv_unix_sock(sock
, iter
, sizeof(*iter
));
442 if (len
!= sizeof(*iter
)) {
445 DBG("received tracepoint field list entry event_name %s event_loglevel %d field_name %s field_type %d",
453 int ustctl_tracer_version(int sock
, struct lttng_ust_tracer_version
*v
)
455 struct ustcomm_ust_msg lum
;
456 struct ustcomm_ust_reply lur
;
462 memset(&lum
, 0, sizeof(lum
));
463 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
464 lum
.cmd
= LTTNG_UST_TRACER_VERSION
;
465 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
468 memcpy(v
, &lur
.u
.version
, sizeof(*v
));
469 DBG("received tracer version");
473 int ustctl_wait_quiescent(int sock
)
475 struct ustcomm_ust_msg lum
;
476 struct ustcomm_ust_reply lur
;
479 memset(&lum
, 0, sizeof(lum
));
480 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
481 lum
.cmd
= LTTNG_UST_WAIT_QUIESCENT
;
482 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
485 DBG("waited for quiescent state");
489 int ustctl_calibrate(int sock
, struct lttng_ust_calibrate
*calibrate
)
497 int ustctl_sock_flush_buffer(int sock
, struct lttng_ust_object_data
*object
)
499 struct ustcomm_ust_msg lum
;
500 struct ustcomm_ust_reply lur
;
506 memset(&lum
, 0, sizeof(lum
));
507 lum
.handle
= object
->handle
;
508 lum
.cmd
= LTTNG_UST_FLUSH_BUFFER
;
509 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
512 DBG("flushed buffer handle %u", object
->handle
);
517 int ustctl_send_channel(int sock
,
518 enum lttng_ust_chan_type type
,
528 len
= ustcomm_send_unix_sock(sock
, &size
, sizeof(size
));
529 if (len
!= sizeof(size
)) {
536 /* Send channel type */
537 len
= ustcomm_send_unix_sock(sock
, &type
, sizeof(type
));
538 if (len
!= sizeof(type
)) {
546 /* Send channel data */
547 len
= ustcomm_send_unix_sock(sock
, data
, size
);
556 len
= ustcomm_send_fds_unix_sock(sock
, &wakeup_fd
, 1);
567 int ustctl_send_stream(int sock
,
569 uint64_t memory_map_size
,
570 int shm_fd
, int wakeup_fd
,
578 /* finish iteration */
581 len
= ustcomm_send_unix_sock(sock
, &v
, sizeof(v
));
582 if (len
!= sizeof(v
)) {
592 len
= ustcomm_send_unix_sock(sock
, &memory_map_size
,
593 sizeof(memory_map_size
));
594 if (len
!= sizeof(memory_map_size
)) {
602 len
= ustcomm_send_unix_sock(sock
, &stream_nr
,
604 if (len
!= sizeof(stream_nr
)) {
612 /* Send shm fd and wakeup fd */
615 len
= ustcomm_send_fds_unix_sock(sock
, fds
, 2);
625 int ustctl_recv_channel_from_consumer(int sock
,
626 struct lttng_ust_object_data
**_channel_data
)
628 struct lttng_ust_object_data
*channel_data
;
633 channel_data
= zmalloc(sizeof(*channel_data
));
638 channel_data
->type
= LTTNG_UST_OBJECT_TYPE_CHANNEL
;
639 channel_data
->handle
= -1;
642 len
= ustcomm_recv_unix_sock(sock
, &channel_data
->size
,
643 sizeof(channel_data
->size
));
644 if (len
!= sizeof(channel_data
->size
)) {
652 /* recv channel type */
653 len
= ustcomm_recv_unix_sock(sock
, &channel_data
->u
.channel
.type
,
654 sizeof(channel_data
->u
.channel
.type
));
655 if (len
!= sizeof(channel_data
->u
.channel
.type
)) {
663 /* recv channel data */
664 channel_data
->u
.channel
.data
= zmalloc(channel_data
->size
);
665 if (!channel_data
->u
.channel
.data
) {
669 len
= ustcomm_recv_unix_sock(sock
, channel_data
->u
.channel
.data
,
671 if (len
!= channel_data
->size
) {
676 goto error_recv_data
;
679 len
= ustcomm_recv_fds_unix_sock(sock
, &wakeup_fd
, 1);
683 goto error_recv_data
;
686 goto error_recv_data
;
689 channel_data
->u
.channel
.wakeup_fd
= wakeup_fd
;
690 *_channel_data
= channel_data
;
694 free(channel_data
->u
.channel
.data
);
701 int ustctl_recv_stream_from_consumer(int sock
,
702 struct lttng_ust_object_data
**_stream_data
)
704 struct lttng_ust_object_data
*stream_data
;
709 stream_data
= zmalloc(sizeof(*stream_data
));
715 stream_data
->type
= LTTNG_UST_OBJECT_TYPE_STREAM
;
716 stream_data
->handle
= -1;
719 len
= ustcomm_recv_unix_sock(sock
, &stream_data
->size
,
720 sizeof(stream_data
->size
));
721 if (len
!= sizeof(stream_data
->size
)) {
728 if (stream_data
->size
== -1) {
729 ret
= -LTTNG_UST_ERR_NOENT
;
734 len
= ustcomm_recv_unix_sock(sock
, &stream_data
->u
.stream
.stream_nr
,
735 sizeof(stream_data
->u
.stream
.stream_nr
));
736 if (len
!= sizeof(stream_data
->u
.stream
.stream_nr
)) {
744 /* recv shm fd and wakeup fd */
745 len
= ustcomm_recv_fds_unix_sock(sock
, fds
, 2);
755 stream_data
->u
.stream
.shm_fd
= fds
[0];
756 stream_data
->u
.stream
.wakeup_fd
= fds
[1];
757 *_stream_data
= stream_data
;
766 int ustctl_send_channel_to_ust(int sock
, int session_handle
,
767 struct lttng_ust_object_data
*channel_data
)
769 struct ustcomm_ust_msg lum
;
770 struct ustcomm_ust_reply lur
;
776 memset(&lum
, 0, sizeof(lum
));
777 lum
.handle
= session_handle
;
778 lum
.cmd
= LTTNG_UST_CHANNEL
;
779 lum
.u
.channel
.len
= channel_data
->size
;
780 lum
.u
.channel
.type
= channel_data
->u
.channel
.type
;
781 ret
= ustcomm_send_app_msg(sock
, &lum
);
785 ret
= ustctl_send_channel(sock
,
786 channel_data
->u
.channel
.type
,
787 channel_data
->u
.channel
.data
,
789 channel_data
->u
.channel
.wakeup_fd
,
793 ret
= ustcomm_recv_app_reply(sock
, &lur
, lum
.handle
, lum
.cmd
);
795 channel_data
->handle
= lur
.ret_val
;
800 int ustctl_send_stream_to_ust(int sock
,
801 struct lttng_ust_object_data
*channel_data
,
802 struct lttng_ust_object_data
*stream_data
)
804 struct ustcomm_ust_msg lum
;
805 struct ustcomm_ust_reply lur
;
808 memset(&lum
, 0, sizeof(lum
));
809 lum
.handle
= channel_data
->handle
;
810 lum
.cmd
= LTTNG_UST_STREAM
;
811 lum
.u
.stream
.len
= stream_data
->size
;
812 lum
.u
.stream
.stream_nr
= stream_data
->u
.stream
.stream_nr
;
813 ret
= ustcomm_send_app_msg(sock
, &lum
);
818 assert(stream_data
->type
== LTTNG_UST_OBJECT_TYPE_STREAM
);
820 ret
= ustctl_send_stream(sock
,
821 stream_data
->u
.stream
.stream_nr
,
823 stream_data
->u
.stream
.shm_fd
,
824 stream_data
->u
.stream
.wakeup_fd
, 1);
827 return ustcomm_recv_app_reply(sock
, &lur
, lum
.handle
, lum
.cmd
);
830 int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data
**dest
,
831 struct lttng_ust_object_data
*src
)
833 struct lttng_ust_object_data
*obj
;
836 if (src
->handle
!= -1) {
841 obj
= zmalloc(sizeof(*obj
));
847 obj
->type
= src
->type
;
848 obj
->handle
= src
->handle
;
849 obj
->size
= src
->size
;
852 case LTTNG_UST_OBJECT_TYPE_CHANNEL
:
854 obj
->u
.channel
.type
= src
->u
.channel
.type
;
855 if (src
->u
.channel
.wakeup_fd
>= 0) {
856 obj
->u
.channel
.wakeup_fd
=
857 dup(src
->u
.channel
.wakeup_fd
);
858 if (obj
->u
.channel
.wakeup_fd
< 0) {
860 goto chan_error_wakeup_fd
;
863 obj
->u
.channel
.wakeup_fd
=
864 src
->u
.channel
.wakeup_fd
;
866 obj
->u
.channel
.data
= zmalloc(obj
->size
);
867 if (!obj
->u
.channel
.data
) {
869 goto chan_error_alloc
;
871 memcpy(obj
->u
.channel
.data
, src
->u
.channel
.data
, obj
->size
);
875 if (src
->u
.channel
.wakeup_fd
>= 0) {
878 closeret
= close(obj
->u
.channel
.wakeup_fd
);
883 chan_error_wakeup_fd
:
888 case LTTNG_UST_OBJECT_TYPE_STREAM
:
890 obj
->u
.stream
.stream_nr
= src
->u
.stream
.stream_nr
;
891 if (src
->u
.stream
.wakeup_fd
>= 0) {
892 obj
->u
.stream
.wakeup_fd
=
893 dup(src
->u
.stream
.wakeup_fd
);
894 if (obj
->u
.stream
.wakeup_fd
< 0) {
896 goto stream_error_wakeup_fd
;
899 obj
->u
.stream
.wakeup_fd
=
900 src
->u
.stream
.wakeup_fd
;
903 if (src
->u
.stream
.shm_fd
>= 0) {
904 obj
->u
.stream
.shm_fd
=
905 dup(src
->u
.stream
.shm_fd
);
906 if (obj
->u
.stream
.shm_fd
< 0) {
908 goto stream_error_shm_fd
;
911 obj
->u
.stream
.shm_fd
=
912 src
->u
.stream
.shm_fd
;
917 if (src
->u
.stream
.wakeup_fd
>= 0) {
920 closeret
= close(obj
->u
.stream
.wakeup_fd
);
925 stream_error_wakeup_fd
:
944 /* Buffer operations */
946 struct ustctl_consumer_channel
*
947 ustctl_create_channel(struct ustctl_consumer_channel_attr
*attr
)
949 struct ustctl_consumer_channel
*chan
;
950 const char *transport_name
;
951 struct lttng_transport
*transport
;
953 switch (attr
->type
) {
954 case LTTNG_UST_CHAN_PER_CPU
:
955 if (attr
->output
== LTTNG_UST_MMAP
) {
956 if (attr
->overwrite
) {
957 if (attr
->read_timer_interval
== 0) {
958 transport_name
= "relay-overwrite-mmap";
960 transport_name
= "relay-overwrite-rt-mmap";
963 if (attr
->read_timer_interval
== 0) {
964 transport_name
= "relay-discard-mmap";
966 transport_name
= "relay-discard-rt-mmap";
973 case LTTNG_UST_CHAN_METADATA
:
974 if (attr
->output
== LTTNG_UST_MMAP
)
975 transport_name
= "relay-metadata-mmap";
980 transport_name
= "<unknown>";
984 transport
= lttng_transport_find(transport_name
);
986 DBG("LTTng transport %s not found\n",
991 chan
= zmalloc(sizeof(*chan
));
995 chan
->chan
= transport
->ops
.channel_create(transport_name
, NULL
,
996 attr
->subbuf_size
, attr
->num_subbuf
,
997 attr
->switch_timer_interval
,
998 attr
->read_timer_interval
,
999 attr
->uuid
, attr
->chan_id
);
1003 chan
->chan
->ops
= &transport
->ops
;
1004 memcpy(&chan
->attr
, attr
, sizeof(chan
->attr
));
1005 chan
->wait_fd
= ustctl_channel_get_wait_fd(chan
);
1006 chan
->wakeup_fd
= ustctl_channel_get_wakeup_fd(chan
);
1014 void ustctl_destroy_channel(struct ustctl_consumer_channel
*chan
)
1016 (void) ustctl_channel_close_wait_fd(chan
);
1017 (void) ustctl_channel_close_wakeup_fd(chan
);
1018 chan
->chan
->ops
->channel_destroy(chan
->chan
);
1022 int ustctl_send_channel_to_sessiond(int sock
,
1023 struct ustctl_consumer_channel
*channel
)
1025 struct shm_object_table
*table
;
1027 table
= channel
->chan
->handle
->table
;
1028 if (table
->size
<= 0)
1030 return ustctl_send_channel(sock
,
1032 table
->objects
[0].memory_map
,
1033 table
->objects
[0].memory_map_size
,
1038 int ustctl_send_stream_to_sessiond(int sock
,
1039 struct ustctl_consumer_stream
*stream
)
1042 return ustctl_send_stream(sock
, -1U, -1U, -1, -1, 0);
1044 return ustctl_send_stream(sock
,
1046 stream
->memory_map_size
,
1047 stream
->shm_fd
, stream
->wakeup_fd
,
1051 int ustctl_write_metadata_to_channel(
1052 struct ustctl_consumer_channel
*channel
,
1053 const char *metadata_str
, /* NOT null-terminated */
1054 size_t len
) /* metadata length */
1056 struct lttng_ust_lib_ring_buffer_ctx ctx
;
1057 struct lttng_channel
*chan
= channel
->chan
;
1058 const char *str
= metadata_str
;
1059 int ret
= 0, waitret
;
1060 size_t reserve_len
, pos
;
1062 for (pos
= 0; pos
< len
; pos
+= reserve_len
) {
1063 reserve_len
= min_t(size_t,
1064 chan
->ops
->packet_avail_size(chan
->chan
, chan
->handle
),
1066 lib_ring_buffer_ctx_init(&ctx
, chan
->chan
, NULL
, reserve_len
,
1067 sizeof(char), -1, chan
->handle
);
1069 * We don't care about metadata buffer's records lost
1070 * count, because we always retry here. Report error if
1071 * we need to bail out after timeout or being
1074 waitret
= wait_cond_interruptible_timeout(
1076 ret
= chan
->ops
->event_reserve(&ctx
, 0);
1077 ret
!= -ENOBUFS
|| !ret
;
1079 LTTNG_METADATA_TIMEOUT_MSEC
);
1080 if (waitret
== -ETIMEDOUT
|| waitret
== -EINTR
|| ret
) {
1081 DBG("LTTng: Failure to write metadata to buffers (%s)\n",
1082 waitret
== -EINTR
? "interrupted" :
1083 (ret
== -ENOBUFS
? "timeout" : "I/O error"));
1084 if (waitret
== -EINTR
)
1088 chan
->ops
->event_write(&ctx
, &str
[pos
], reserve_len
);
1089 chan
->ops
->event_commit(&ctx
);
1096 * Write at most one packet in the channel.
1097 * Returns the number of bytes written on success, < 0 on error.
1099 ssize_t
ustctl_write_one_packet_to_channel(
1100 struct ustctl_consumer_channel
*channel
,
1101 const char *metadata_str
, /* NOT null-terminated */
1102 size_t len
) /* metadata length */
1104 struct lttng_ust_lib_ring_buffer_ctx ctx
;
1105 struct lttng_channel
*chan
= channel
->chan
;
1106 const char *str
= metadata_str
;
1107 ssize_t reserve_len
;
1110 reserve_len
= min_t(ssize_t
,
1111 chan
->ops
->packet_avail_size(chan
->chan
, chan
->handle
),
1113 lib_ring_buffer_ctx_init(&ctx
, chan
->chan
, NULL
, reserve_len
,
1114 sizeof(char), -1, chan
->handle
);
1115 ret
= chan
->ops
->event_reserve(&ctx
, 0);
1117 DBG("LTTng: event reservation failed");
1122 chan
->ops
->event_write(&ctx
, str
, reserve_len
);
1123 chan
->ops
->event_commit(&ctx
);
1129 int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel
*consumer_chan
)
1131 struct channel
*chan
;
1134 chan
= consumer_chan
->chan
->chan
;
1135 ret
= ring_buffer_channel_close_wait_fd(&chan
->backend
.config
,
1136 chan
, chan
->handle
);
1138 consumer_chan
->wait_fd
= -1;
1142 int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel
*consumer_chan
)
1144 struct channel
*chan
;
1147 chan
= consumer_chan
->chan
->chan
;
1148 ret
= ring_buffer_channel_close_wakeup_fd(&chan
->backend
.config
,
1149 chan
, chan
->handle
);
1151 consumer_chan
->wakeup_fd
= -1;
1155 int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream
*stream
)
1157 struct channel
*chan
;
1159 chan
= stream
->chan
->chan
->chan
;
1160 return ring_buffer_stream_close_wait_fd(&chan
->backend
.config
,
1161 chan
, stream
->handle
, stream
->cpu
);
1164 int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream
*stream
)
1166 struct channel
*chan
;
1168 chan
= stream
->chan
->chan
->chan
;
1169 return ring_buffer_stream_close_wakeup_fd(&chan
->backend
.config
,
1170 chan
, stream
->handle
, stream
->cpu
);
1173 struct ustctl_consumer_stream
*
1174 ustctl_create_stream(struct ustctl_consumer_channel
*channel
,
1177 struct ustctl_consumer_stream
*stream
;
1178 struct lttng_ust_shm_handle
*handle
;
1179 struct channel
*chan
;
1180 int shm_fd
, wait_fd
, wakeup_fd
;
1181 uint64_t memory_map_size
;
1182 struct lttng_ust_lib_ring_buffer
*buf
;
1187 handle
= channel
->chan
->handle
;
1191 chan
= channel
->chan
->chan
;
1192 buf
= channel_get_ring_buffer(&chan
->backend
.config
,
1193 chan
, cpu
, handle
, &shm_fd
, &wait_fd
,
1194 &wakeup_fd
, &memory_map_size
);
1197 ret
= lib_ring_buffer_open_read(buf
, handle
);
1201 stream
= zmalloc(sizeof(*stream
));
1204 stream
->handle
= handle
;
1206 stream
->chan
= channel
;
1207 stream
->shm_fd
= shm_fd
;
1208 stream
->wait_fd
= wait_fd
;
1209 stream
->wakeup_fd
= wakeup_fd
;
1210 stream
->memory_map_size
= memory_map_size
;
1218 void ustctl_destroy_stream(struct ustctl_consumer_stream
*stream
)
1220 struct lttng_ust_lib_ring_buffer
*buf
;
1221 struct ustctl_consumer_channel
*consumer_chan
;
1225 consumer_chan
= stream
->chan
;
1226 (void) ustctl_stream_close_wait_fd(stream
);
1227 (void) ustctl_stream_close_wakeup_fd(stream
);
1228 lib_ring_buffer_release_read(buf
, consumer_chan
->chan
->handle
);
1232 int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel
*chan
)
1236 return shm_get_wait_fd(chan
->chan
->handle
,
1237 &chan
->chan
->handle
->chan
._ref
);
1240 int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel
*chan
)
1244 return shm_get_wakeup_fd(chan
->chan
->handle
,
1245 &chan
->chan
->handle
->chan
._ref
);
1248 int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream
*stream
)
1250 struct lttng_ust_lib_ring_buffer
*buf
;
1251 struct ustctl_consumer_channel
*consumer_chan
;
1256 consumer_chan
= stream
->chan
;
1257 return shm_get_wait_fd(consumer_chan
->chan
->handle
, &buf
->self
._ref
);
1260 int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream
*stream
)
1262 struct lttng_ust_lib_ring_buffer
*buf
;
1263 struct ustctl_consumer_channel
*consumer_chan
;
1268 consumer_chan
= stream
->chan
;
1269 return shm_get_wakeup_fd(consumer_chan
->chan
->handle
, &buf
->self
._ref
);
1272 /* For mmap mode, readable without "get" operation */
1274 void *ustctl_get_mmap_base(struct ustctl_consumer_stream
*stream
)
1276 struct lttng_ust_lib_ring_buffer
*buf
;
1277 struct ustctl_consumer_channel
*consumer_chan
;
1282 consumer_chan
= stream
->chan
;
1283 return shmp(consumer_chan
->chan
->handle
, buf
->backend
.memory_map
);
1286 /* returns the length to mmap. */
1287 int ustctl_get_mmap_len(struct ustctl_consumer_stream
*stream
,
1290 struct ustctl_consumer_channel
*consumer_chan
;
1291 unsigned long mmap_buf_len
;
1292 struct channel
*chan
;
1296 consumer_chan
= stream
->chan
;
1297 chan
= consumer_chan
->chan
->chan
;
1298 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
1300 mmap_buf_len
= chan
->backend
.buf_size
;
1301 if (chan
->backend
.extra_reader_sb
)
1302 mmap_buf_len
+= chan
->backend
.subbuf_size
;
1303 if (mmap_buf_len
> INT_MAX
)
1305 *len
= mmap_buf_len
;
1309 /* returns the maximum size for sub-buffers. */
1310 int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream
*stream
,
1313 struct ustctl_consumer_channel
*consumer_chan
;
1314 struct channel
*chan
;
1318 consumer_chan
= stream
->chan
;
1319 chan
= consumer_chan
->chan
->chan
;
1320 *len
= chan
->backend
.subbuf_size
;
1325 * For mmap mode, operate on the current packet (between get/put or
1326 * get_next/put_next).
1329 /* returns the offset of the subbuffer belonging to the mmap reader. */
1330 int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream
*stream
,
1333 struct channel
*chan
;
1334 unsigned long sb_bindex
;
1335 struct lttng_ust_lib_ring_buffer
*buf
;
1336 struct ustctl_consumer_channel
*consumer_chan
;
1341 consumer_chan
= stream
->chan
;
1342 chan
= consumer_chan
->chan
->chan
;
1343 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
1345 sb_bindex
= subbuffer_id_get_index(&chan
->backend
.config
,
1346 buf
->backend
.buf_rsb
.id
);
1347 *off
= shmp(consumer_chan
->chan
->handle
,
1348 shmp_index(consumer_chan
->chan
->handle
, buf
->backend
.array
, sb_bindex
)->shmp
)->mmap_offset
;
1352 /* returns the size of the current sub-buffer, without padding (for mmap). */
1353 int ustctl_get_subbuf_size(struct ustctl_consumer_stream
*stream
,
1356 struct ustctl_consumer_channel
*consumer_chan
;
1357 struct channel
*chan
;
1358 struct lttng_ust_lib_ring_buffer
*buf
;
1364 consumer_chan
= stream
->chan
;
1365 chan
= consumer_chan
->chan
->chan
;
1366 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
1367 consumer_chan
->chan
->handle
);
1371 /* returns the size of the current sub-buffer, without padding (for mmap). */
1372 int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream
*stream
,
1375 struct ustctl_consumer_channel
*consumer_chan
;
1376 struct channel
*chan
;
1377 struct lttng_ust_lib_ring_buffer
*buf
;
1382 consumer_chan
= stream
->chan
;
1383 chan
= consumer_chan
->chan
->chan
;
1384 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
1385 consumer_chan
->chan
->handle
);
1386 *len
= PAGE_ALIGN(*len
);
1390 /* Get exclusive read access to the next sub-buffer that can be read. */
1391 int ustctl_get_next_subbuf(struct ustctl_consumer_stream
*stream
)
1393 struct lttng_ust_lib_ring_buffer
*buf
;
1394 struct ustctl_consumer_channel
*consumer_chan
;
1399 consumer_chan
= stream
->chan
;
1400 return lib_ring_buffer_get_next_subbuf(buf
,
1401 consumer_chan
->chan
->handle
);
1405 /* Release exclusive sub-buffer access, move consumer forward. */
1406 int ustctl_put_next_subbuf(struct ustctl_consumer_stream
*stream
)
1408 struct lttng_ust_lib_ring_buffer
*buf
;
1409 struct ustctl_consumer_channel
*consumer_chan
;
1414 consumer_chan
= stream
->chan
;
1415 lib_ring_buffer_put_next_subbuf(buf
, consumer_chan
->chan
->handle
);
1421 /* Get a snapshot of the current ring buffer producer and consumer positions */
1422 int ustctl_snapshot(struct ustctl_consumer_stream
*stream
)
1424 struct lttng_ust_lib_ring_buffer
*buf
;
1425 struct ustctl_consumer_channel
*consumer_chan
;
1430 consumer_chan
= stream
->chan
;
1431 return lib_ring_buffer_snapshot(buf
, &buf
->cons_snapshot
,
1432 &buf
->prod_snapshot
, consumer_chan
->chan
->handle
);
1435 /* Get the consumer position (iteration start) */
1436 int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream
*stream
,
1439 struct lttng_ust_lib_ring_buffer
*buf
;
1444 *pos
= buf
->cons_snapshot
;
1448 /* Get the producer position (iteration end) */
1449 int ustctl_snapshot_get_produced(struct ustctl_consumer_stream
*stream
,
1452 struct lttng_ust_lib_ring_buffer
*buf
;
1457 *pos
= buf
->prod_snapshot
;
1461 /* Get exclusive read access to the specified sub-buffer position */
1462 int ustctl_get_subbuf(struct ustctl_consumer_stream
*stream
,
1465 struct lttng_ust_lib_ring_buffer
*buf
;
1466 struct ustctl_consumer_channel
*consumer_chan
;
1471 consumer_chan
= stream
->chan
;
1472 return lib_ring_buffer_get_subbuf(buf
, *pos
,
1473 consumer_chan
->chan
->handle
);
1476 /* Release exclusive sub-buffer access */
1477 int ustctl_put_subbuf(struct ustctl_consumer_stream
*stream
)
1479 struct lttng_ust_lib_ring_buffer
*buf
;
1480 struct ustctl_consumer_channel
*consumer_chan
;
1485 consumer_chan
= stream
->chan
;
1486 lib_ring_buffer_put_subbuf(buf
, consumer_chan
->chan
->handle
);
1490 void ustctl_flush_buffer(struct ustctl_consumer_stream
*stream
,
1491 int producer_active
)
1493 struct lttng_ust_lib_ring_buffer
*buf
;
1494 struct ustctl_consumer_channel
*consumer_chan
;
1498 consumer_chan
= stream
->chan
;
1499 lib_ring_buffer_switch_slow(buf
,
1500 producer_active
? SWITCH_ACTIVE
: SWITCH_FLUSH
,
1501 consumer_chan
->chan
->handle
);
1505 struct lttng_ust_client_lib_ring_buffer_client_cb
*get_client_cb(
1506 struct lttng_ust_lib_ring_buffer
*buf
,
1507 struct lttng_ust_shm_handle
*handle
)
1509 struct channel
*chan
;
1510 const struct lttng_ust_lib_ring_buffer_config
*config
;
1511 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1513 chan
= shmp(handle
, buf
->backend
.chan
);
1514 config
= &chan
->backend
.config
;
1515 if (!config
->cb_ptr
)
1517 client_cb
= caa_container_of(config
->cb_ptr
,
1518 struct lttng_ust_client_lib_ring_buffer_client_cb
,
1523 int ustctl_get_timestamp_begin(struct ustctl_consumer_stream
*stream
,
1524 uint64_t *timestamp_begin
)
1526 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1527 struct lttng_ust_lib_ring_buffer
*buf
;
1528 struct lttng_ust_shm_handle
*handle
;
1530 if (!stream
|| !timestamp_begin
)
1533 handle
= stream
->chan
->chan
->handle
;
1534 client_cb
= get_client_cb(buf
, handle
);
1537 return client_cb
->timestamp_begin(buf
, handle
, timestamp_begin
);
1540 int ustctl_get_timestamp_end(struct ustctl_consumer_stream
*stream
,
1541 uint64_t *timestamp_end
)
1543 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1544 struct lttng_ust_lib_ring_buffer
*buf
;
1545 struct lttng_ust_shm_handle
*handle
;
1547 if (!stream
|| !timestamp_end
)
1550 handle
= stream
->chan
->chan
->handle
;
1551 client_cb
= get_client_cb(buf
, handle
);
1554 return client_cb
->timestamp_end(buf
, handle
, timestamp_end
);
1557 int ustctl_get_events_discarded(struct ustctl_consumer_stream
*stream
,
1558 uint64_t *events_discarded
)
1560 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1561 struct lttng_ust_lib_ring_buffer
*buf
;
1562 struct lttng_ust_shm_handle
*handle
;
1564 if (!stream
|| !events_discarded
)
1567 handle
= stream
->chan
->chan
->handle
;
1568 client_cb
= get_client_cb(buf
, handle
);
1571 return client_cb
->events_discarded(buf
, handle
, events_discarded
);
1574 int ustctl_get_content_size(struct ustctl_consumer_stream
*stream
,
1575 uint64_t *content_size
)
1577 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1578 struct lttng_ust_lib_ring_buffer
*buf
;
1579 struct lttng_ust_shm_handle
*handle
;
1581 if (!stream
|| !content_size
)
1584 handle
= stream
->chan
->chan
->handle
;
1585 client_cb
= get_client_cb(buf
, handle
);
1588 return client_cb
->content_size(buf
, handle
, content_size
);
1591 int ustctl_get_packet_size(struct ustctl_consumer_stream
*stream
,
1592 uint64_t *packet_size
)
1594 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1595 struct lttng_ust_lib_ring_buffer
*buf
;
1596 struct lttng_ust_shm_handle
*handle
;
1598 if (!stream
|| !packet_size
)
1601 handle
= stream
->chan
->chan
->handle
;
1602 client_cb
= get_client_cb(buf
, handle
);
1605 return client_cb
->packet_size(buf
, handle
, packet_size
);
1608 int ustctl_get_stream_id(struct ustctl_consumer_stream
*stream
,
1609 uint64_t *stream_id
)
1611 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1612 struct lttng_ust_lib_ring_buffer
*buf
;
1613 struct lttng_ust_shm_handle
*handle
;
1615 if (!stream
|| !stream_id
)
1618 handle
= stream
->chan
->chan
->handle
;
1619 client_cb
= get_client_cb(buf
, handle
);
1622 return client_cb
->stream_id(buf
, handle
, stream_id
);
1625 int ustctl_get_current_timestamp(struct ustctl_consumer_stream
*stream
,
1628 struct lttng_ust_client_lib_ring_buffer_client_cb
*client_cb
;
1629 struct lttng_ust_lib_ring_buffer
*buf
;
1630 struct lttng_ust_shm_handle
*handle
;
1635 handle
= stream
->chan
->chan
->handle
;
1636 client_cb
= get_client_cb(buf
, handle
);
1637 if (!client_cb
|| !client_cb
->current_timestamp
)
1639 return client_cb
->current_timestamp(buf
, handle
, ts
);
1643 * Returns 0 on success, negative error value on error.
1645 int ustctl_recv_reg_msg(int sock
,
1646 enum ustctl_socket_type
*type
,
1653 uint32_t *bits_per_long
,
1654 uint32_t *uint8_t_alignment
,
1655 uint32_t *uint16_t_alignment
,
1656 uint32_t *uint32_t_alignment
,
1657 uint32_t *uint64_t_alignment
,
1658 uint32_t *long_alignment
,
1663 struct ustctl_reg_msg reg_msg
;
1665 len
= ustcomm_recv_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
1666 if (len
> 0 && len
!= sizeof(reg_msg
))
1673 if (reg_msg
.magic
== LTTNG_UST_COMM_MAGIC
) {
1674 *byte_order
= BYTE_ORDER
== BIG_ENDIAN
?
1675 BIG_ENDIAN
: LITTLE_ENDIAN
;
1676 } else if (reg_msg
.magic
== bswap_32(LTTNG_UST_COMM_MAGIC
)) {
1677 *byte_order
= BYTE_ORDER
== BIG_ENDIAN
?
1678 LITTLE_ENDIAN
: BIG_ENDIAN
;
1680 return -LTTNG_UST_ERR_INVAL_MAGIC
;
1682 switch (reg_msg
.socket_type
) {
1683 case 0: *type
= USTCTL_SOCKET_CMD
;
1685 case 1: *type
= USTCTL_SOCKET_NOTIFY
;
1688 return -LTTNG_UST_ERR_INVAL_SOCKET_TYPE
;
1690 *major
= reg_msg
.major
;
1691 *minor
= reg_msg
.minor
;
1693 *ppid
= reg_msg
.ppid
;
1696 *bits_per_long
= reg_msg
.bits_per_long
;
1697 *uint8_t_alignment
= reg_msg
.uint8_t_alignment
;
1698 *uint16_t_alignment
= reg_msg
.uint16_t_alignment
;
1699 *uint32_t_alignment
= reg_msg
.uint32_t_alignment
;
1700 *uint64_t_alignment
= reg_msg
.uint64_t_alignment
;
1701 *long_alignment
= reg_msg
.long_alignment
;
1702 memcpy(name
, reg_msg
.name
, LTTNG_UST_ABI_PROCNAME_LEN
);
1703 if (reg_msg
.major
!= LTTNG_UST_ABI_MAJOR_VERSION
) {
1704 return -LTTNG_UST_ERR_UNSUP_MAJOR
;
1710 int ustctl_recv_notify(int sock
, enum ustctl_notify_cmd
*notify_cmd
)
1712 struct ustcomm_notify_hdr header
;
1715 len
= ustcomm_recv_unix_sock(sock
, &header
, sizeof(header
));
1716 if (len
> 0 && len
!= sizeof(header
))
1722 switch (header
.notify_cmd
) {
1724 *notify_cmd
= USTCTL_NOTIFY_CMD_EVENT
;
1727 *notify_cmd
= USTCTL_NOTIFY_CMD_CHANNEL
;
1736 * Returns 0 on success, negative error value on error.
1738 int ustctl_recv_register_event(int sock
,
1745 struct ustctl_field
**fields
,
1746 char **model_emf_uri
)
1749 struct ustcomm_notify_event_msg msg
;
1750 size_t signature_len
, fields_len
, model_emf_uri_len
;
1751 char *a_sign
= NULL
, *a_model_emf_uri
= NULL
;
1752 struct ustctl_field
*a_fields
= NULL
;
1754 len
= ustcomm_recv_unix_sock(sock
, &msg
, sizeof(msg
));
1755 if (len
> 0 && len
!= sizeof(msg
))
1762 *session_objd
= msg
.session_objd
;
1763 *channel_objd
= msg
.channel_objd
;
1764 strncpy(event_name
, msg
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1765 event_name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
1766 *loglevel
= msg
.loglevel
;
1767 signature_len
= msg
.signature_len
;
1768 fields_len
= msg
.fields_len
;
1770 if (fields_len
% sizeof(*a_fields
) != 0) {
1774 model_emf_uri_len
= msg
.model_emf_uri_len
;
1776 /* recv signature. contains at least \0. */
1777 a_sign
= zmalloc(signature_len
);
1780 len
= ustcomm_recv_unix_sock(sock
, a_sign
, signature_len
);
1781 if (len
> 0 && len
!= signature_len
) {
1783 goto signature_error
;
1787 goto signature_error
;
1790 goto signature_error
;
1792 /* Enforce end of string */
1793 a_sign
[signature_len
- 1] = '\0';
1797 a_fields
= zmalloc(fields_len
);
1800 goto signature_error
;
1802 len
= ustcomm_recv_unix_sock(sock
, a_fields
, fields_len
);
1803 if (len
> 0 && len
!= fields_len
) {
1816 if (model_emf_uri_len
) {
1817 /* recv model_emf_uri_len */
1818 a_model_emf_uri
= zmalloc(model_emf_uri_len
);
1819 if (!a_model_emf_uri
) {
1823 len
= ustcomm_recv_unix_sock(sock
, a_model_emf_uri
,
1825 if (len
> 0 && len
!= model_emf_uri_len
) {
1836 /* Enforce end of string */
1837 a_model_emf_uri
[model_emf_uri_len
- 1] = '\0';
1840 *signature
= a_sign
;
1841 *nr_fields
= fields_len
/ sizeof(*a_fields
);
1843 *model_emf_uri
= a_model_emf_uri
;
1848 free(a_model_emf_uri
);
1857 * Returns 0 on success, negative error value on error.
1859 int ustctl_reply_register_event(int sock
,
1865 struct ustcomm_notify_hdr header
;
1866 struct ustcomm_notify_event_reply r
;
1869 memset(&reply
, 0, sizeof(reply
));
1870 reply
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_EVENT
;
1871 reply
.r
.ret_code
= ret_code
;
1872 reply
.r
.event_id
= id
;
1873 len
= ustcomm_send_unix_sock(sock
, &reply
, sizeof(reply
));
1874 if (len
> 0 && len
!= sizeof(reply
))
1882 * Returns 0 on success, negative UST or system error value on error.
1884 int ustctl_recv_register_channel(int sock
,
1885 int *session_objd
, /* session descriptor (output) */
1886 int *channel_objd
, /* channel descriptor (output) */
1888 struct ustctl_field
**fields
)
1891 struct ustcomm_notify_channel_msg msg
;
1893 struct ustctl_field
*a_fields
;
1895 len
= ustcomm_recv_unix_sock(sock
, &msg
, sizeof(msg
));
1896 if (len
> 0 && len
!= sizeof(msg
))
1903 *session_objd
= msg
.session_objd
;
1904 *channel_objd
= msg
.channel_objd
;
1905 fields_len
= msg
.ctx_fields_len
;
1907 if (fields_len
% sizeof(*a_fields
) != 0) {
1913 a_fields
= zmalloc(fields_len
);
1918 len
= ustcomm_recv_unix_sock(sock
, a_fields
, fields_len
);
1919 if (len
> 0 && len
!= fields_len
) {
1934 *nr_fields
= fields_len
/ sizeof(*a_fields
);
1944 * Returns 0 on success, negative error value on error.
1946 int ustctl_reply_register_channel(int sock
,
1948 enum ustctl_channel_header header_type
,
1953 struct ustcomm_notify_hdr header
;
1954 struct ustcomm_notify_channel_reply r
;
1957 memset(&reply
, 0, sizeof(reply
));
1958 reply
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_CHANNEL
;
1959 reply
.r
.ret_code
= ret_code
;
1960 reply
.r
.chan_id
= chan_id
;
1961 switch (header_type
) {
1962 case USTCTL_CHANNEL_HEADER_COMPACT
:
1963 reply
.r
.header_type
= 1;
1965 case USTCTL_CHANNEL_HEADER_LARGE
:
1966 reply
.r
.header_type
= 2;
1969 reply
.r
.header_type
= 0;
1972 len
= ustcomm_send_unix_sock(sock
, &reply
, sizeof(reply
));
1973 if (len
> 0 && len
!= sizeof(reply
))
1980 static __attribute__((constructor
))
1981 void ustctl_init(void)
1984 lttng_ring_buffer_metadata_client_init();
1985 lttng_ring_buffer_client_overwrite_init();
1986 lttng_ring_buffer_client_overwrite_rt_init();
1987 lttng_ring_buffer_client_discard_init();
1988 lttng_ring_buffer_client_discard_rt_init();
1989 lib_ringbuffer_signal_init();
1992 static __attribute__((destructor
))
1993 void ustctl_exit(void)
1995 lttng_ring_buffer_client_discard_rt_exit();
1996 lttng_ring_buffer_client_discard_exit();
1997 lttng_ring_buffer_client_overwrite_rt_exit();
1998 lttng_ring_buffer_client_overwrite_exit();
1999 lttng_ring_buffer_metadata_client_exit();