2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License 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>
26 #include <usterr-signal-safe.h>
29 #include "../libringbuffer/backend.h"
30 #include "../libringbuffer/frontend.h"
32 volatile enum ust_loglevel ust_loglevel
;
35 void init_object(struct lttng_ust_object_data
*data
)
40 data
->memory_map_size
= 0;
43 int ustctl_release_handle(int sock
, int handle
)
45 struct ustcomm_ust_msg lum
;
46 struct ustcomm_ust_reply lur
;
50 memset(&lum
, 0, sizeof(lum
));
52 lum
.cmd
= LTTNG_UST_RELEASE
;
53 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
61 * If sock is negative, it means we don't have to notify the other side
62 * (e.g. application has already vanished).
64 int ustctl_release_object(int sock
, struct lttng_ust_object_data
*data
)
71 if (data
->shm_fd
>= 0) {
72 ret
= close(data
->shm_fd
);
77 if (data
->wait_fd
>= 0) {
78 ret
= close(data
->wait_fd
);
83 return ustctl_release_handle(sock
, data
->handle
);
87 * Send registration done packet to the application.
89 int ustctl_register_done(int sock
)
91 struct ustcomm_ust_msg lum
;
92 struct ustcomm_ust_reply lur
;
95 DBG("Sending register done command to %d", sock
);
96 memset(&lum
, 0, sizeof(lum
));
97 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
98 lum
.cmd
= LTTNG_UST_REGISTER_DONE
;
99 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
102 if (lur
.ret_code
!= USTCOMM_OK
) {
103 DBG("Return code: %s", ustcomm_get_readable_code(lur
.ret_code
));
113 * returns session handle.
115 int ustctl_create_session(int sock
)
117 struct ustcomm_ust_msg lum
;
118 struct ustcomm_ust_reply lur
;
119 int ret
, session_handle
;
122 memset(&lum
, 0, sizeof(lum
));
123 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
124 lum
.cmd
= LTTNG_UST_SESSION
;
125 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
128 session_handle
= lur
.ret_val
;
129 DBG("received session handle %u", session_handle
);
130 return session_handle
;
133 /* open the metadata global channel */
134 int ustctl_open_metadata(int sock
, int session_handle
,
135 struct lttng_ust_channel_attr
*chops
,
136 struct lttng_ust_object_data
**_metadata_data
)
138 struct ustcomm_ust_msg lum
;
139 struct ustcomm_ust_reply lur
;
140 struct lttng_ust_object_data
*metadata_data
;
143 if (!chops
|| !_metadata_data
)
146 metadata_data
= malloc(sizeof(*metadata_data
));
149 init_object(metadata_data
);
150 /* Create metadata channel */
151 memset(&lum
, 0, sizeof(lum
));
152 lum
.handle
= session_handle
;
153 lum
.cmd
= LTTNG_UST_METADATA
;
154 lum
.u
.channel
.overwrite
= chops
->overwrite
;
155 lum
.u
.channel
.subbuf_size
= chops
->subbuf_size
;
156 lum
.u
.channel
.num_subbuf
= chops
->num_subbuf
;
157 lum
.u
.channel
.switch_timer_interval
= chops
->switch_timer_interval
;
158 lum
.u
.channel
.read_timer_interval
= chops
->read_timer_interval
;
159 lum
.u
.channel
.output
= chops
->output
;
160 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
165 if (lur
.ret_code
!= USTCOMM_OK
) {
169 metadata_data
->handle
= lur
.ret_val
;
170 DBG("received metadata handle %u", metadata_data
->handle
);
171 metadata_data
->memory_map_size
= lur
.u
.channel
.memory_map_size
;
173 ret
= ustcomm_recv_fd(sock
);
177 metadata_data
->shm_fd
= ret
;
179 * We need to get the second FD even if the first fails, because
180 * libust expects us to read the two FDs.
183 ret
= ustcomm_recv_fd(sock
);
187 metadata_data
->wait_fd
= ret
;
190 *_metadata_data
= metadata_data
;
194 (void) ustctl_release_object(sock
, metadata_data
);
199 int ustctl_create_channel(int sock
, int session_handle
,
200 struct lttng_ust_channel_attr
*chops
,
201 struct lttng_ust_object_data
**_channel_data
)
203 struct ustcomm_ust_msg lum
;
204 struct ustcomm_ust_reply lur
;
205 struct lttng_ust_object_data
*channel_data
;
208 if (!chops
|| !_channel_data
)
211 channel_data
= malloc(sizeof(*channel_data
));
214 init_object(channel_data
);
215 /* Create metadata channel */
216 memset(&lum
, 0, sizeof(lum
));
217 lum
.handle
= session_handle
;
218 lum
.cmd
= LTTNG_UST_CHANNEL
;
219 lum
.u
.channel
.overwrite
= chops
->overwrite
;
220 lum
.u
.channel
.subbuf_size
= chops
->subbuf_size
;
221 lum
.u
.channel
.num_subbuf
= chops
->num_subbuf
;
222 lum
.u
.channel
.switch_timer_interval
= chops
->switch_timer_interval
;
223 lum
.u
.channel
.read_timer_interval
= chops
->read_timer_interval
;
224 lum
.u
.channel
.output
= chops
->output
;
225 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
230 if (lur
.ret_code
!= USTCOMM_OK
) {
234 channel_data
->handle
= lur
.ret_val
;
235 DBG("received channel handle %u", channel_data
->handle
);
236 channel_data
->memory_map_size
= lur
.u
.channel
.memory_map_size
;
238 ret
= ustcomm_recv_fd(sock
);
242 channel_data
->shm_fd
= ret
;
244 * We need to get the second FD even if the first fails, because
245 * libust expects us to read the two FDs.
248 ret
= ustcomm_recv_fd(sock
);
252 channel_data
->wait_fd
= ret
;
255 *_channel_data
= channel_data
;
259 (void) ustctl_release_object(sock
, channel_data
);
265 * Return -ENOENT if no more stream is available for creation.
266 * Return 0 on success.
267 * Return negative error value on error.
269 int ustctl_create_stream(int sock
, struct lttng_ust_object_data
*channel_data
,
270 struct lttng_ust_object_data
**_stream_data
)
272 struct ustcomm_ust_msg lum
;
273 struct ustcomm_ust_reply lur
;
274 struct lttng_ust_object_data
*stream_data
;
275 int ret
, fd
, err
= 0;
277 if (!channel_data
|| !_stream_data
)
280 stream_data
= malloc(sizeof(*stream_data
));
283 init_object(stream_data
);
284 memset(&lum
, 0, sizeof(lum
));
285 lum
.handle
= channel_data
->handle
;
286 lum
.cmd
= LTTNG_UST_STREAM
;
287 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
292 if (lur
.ret_code
!= USTCOMM_OK
) {
297 stream_data
->handle
= lur
.ret_val
;
298 DBG("received stream handle %u", stream_data
->handle
);
299 stream_data
->memory_map_size
= lur
.u
.stream
.memory_map_size
;
301 fd
= ustcomm_recv_fd(sock
);
305 stream_data
->shm_fd
= fd
;
307 * We need to get the second FD even if the first fails, because
308 * libust expects us to read the two FDs.
311 fd
= ustcomm_recv_fd(sock
);
315 stream_data
->wait_fd
= fd
;
318 *_stream_data
= stream_data
;
322 (void) ustctl_release_object(sock
, stream_data
);
327 int ustctl_create_event(int sock
, struct lttng_ust_event
*ev
,
328 struct lttng_ust_object_data
*channel_data
,
329 struct lttng_ust_object_data
**_event_data
)
331 struct ustcomm_ust_msg lum
;
332 struct ustcomm_ust_reply lur
;
333 struct lttng_ust_object_data
*event_data
;
336 if (!channel_data
|| !_event_data
)
339 event_data
= malloc(sizeof(*event_data
));
342 init_object(event_data
);
343 memset(&lum
, 0, sizeof(lum
));
344 lum
.handle
= channel_data
->handle
;
345 lum
.cmd
= LTTNG_UST_EVENT
;
346 strncpy(lum
.u
.event
.name
, ev
->name
,
347 LTTNG_UST_SYM_NAME_LEN
);
348 lum
.u
.event
.instrumentation
= ev
->instrumentation
;
349 lum
.u
.event
.loglevel_type
= ev
->loglevel_type
;
350 lum
.u
.event
.loglevel
= ev
->loglevel
;
351 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
356 event_data
->handle
= lur
.ret_val
;
357 DBG("received event handle %u", event_data
->handle
);
358 *_event_data
= event_data
;
362 int ustctl_add_context(int sock
, struct lttng_ust_context
*ctx
,
363 struct lttng_ust_object_data
*obj_data
,
364 struct lttng_ust_object_data
**_context_data
)
366 struct ustcomm_ust_msg lum
;
367 struct ustcomm_ust_reply lur
;
368 struct lttng_ust_object_data
*context_data
;
371 if (!obj_data
|| !_context_data
)
374 context_data
= malloc(sizeof(*context_data
));
377 init_object(context_data
);
378 memset(&lum
, 0, sizeof(lum
));
379 lum
.handle
= obj_data
->handle
;
380 lum
.cmd
= LTTNG_UST_CONTEXT
;
381 lum
.u
.context
.ctx
= ctx
->ctx
;
382 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
387 context_data
->handle
= lur
.ret_val
;
388 DBG("received context handle %u", context_data
->handle
);
389 *_context_data
= context_data
;
393 /* Enable event, channel and session ioctl */
394 int ustctl_enable(int sock
, struct lttng_ust_object_data
*object
)
396 struct ustcomm_ust_msg lum
;
397 struct ustcomm_ust_reply lur
;
403 memset(&lum
, 0, sizeof(lum
));
404 lum
.handle
= object
->handle
;
405 lum
.cmd
= LTTNG_UST_ENABLE
;
406 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
409 DBG("enabled handle %u", object
->handle
);
413 /* Disable event, channel and session ioctl */
414 int ustctl_disable(int sock
, struct lttng_ust_object_data
*object
)
416 struct ustcomm_ust_msg lum
;
417 struct ustcomm_ust_reply lur
;
423 memset(&lum
, 0, sizeof(lum
));
424 lum
.handle
= object
->handle
;
425 lum
.cmd
= LTTNG_UST_DISABLE
;
426 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
429 DBG("disable handle %u", object
->handle
);
433 int ustctl_start_session(int sock
, int handle
)
435 struct lttng_ust_object_data obj
;
438 return ustctl_enable(sock
, &obj
);
441 int ustctl_stop_session(int sock
, int handle
)
443 struct lttng_ust_object_data obj
;
446 return ustctl_disable(sock
, &obj
);
449 int ustctl_tracepoint_list(int sock
)
451 struct ustcomm_ust_msg lum
;
452 struct ustcomm_ust_reply lur
;
453 int ret
, tp_list_handle
;
455 memset(&lum
, 0, sizeof(lum
));
456 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
457 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST
;
458 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
461 tp_list_handle
= lur
.ret_val
;
462 DBG("received tracepoint list handle %u", tp_list_handle
);
463 return tp_list_handle
;
466 int ustctl_tracepoint_list_get(int sock
, int tp_list_handle
,
467 struct lttng_ust_tracepoint_iter
*iter
)
469 struct ustcomm_ust_msg lum
;
470 struct ustcomm_ust_reply lur
;
476 memset(&lum
, 0, sizeof(lum
));
477 lum
.handle
= tp_list_handle
;
478 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST_GET
;
479 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
482 DBG("received tracepoint list entry name %s loglevel %d",
483 lur
.u
.tracepoint
.name
,
484 lur
.u
.tracepoint
.loglevel
);
485 memcpy(iter
, &lur
.u
.tracepoint
, sizeof(*iter
));
489 int ustctl_tracepoint_field_list(int sock
)
491 struct ustcomm_ust_msg lum
;
492 struct ustcomm_ust_reply lur
;
493 int ret
, tp_field_list_handle
;
495 memset(&lum
, 0, sizeof(lum
));
496 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
497 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST
;
498 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
501 tp_field_list_handle
= lur
.ret_val
;
502 DBG("received tracepoint field list handle %u", tp_field_list_handle
);
503 return tp_field_list_handle
;
506 int ustctl_tracepoint_field_list_get(int sock
, int tp_field_list_handle
,
507 struct lttng_ust_field_iter
*iter
)
509 struct ustcomm_ust_msg lum
;
510 struct ustcomm_ust_reply lur
;
517 memset(&lum
, 0, sizeof(lum
));
518 lum
.handle
= tp_field_list_handle
;
519 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST_GET
;
520 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
523 if (lur
.ret_code
!= USTCOMM_OK
) {
524 DBG("Return code: %s", ustcomm_get_readable_code(lur
.ret_code
));
527 len
= ustcomm_recv_unix_sock(sock
, iter
, sizeof(*iter
));
528 if (len
!= sizeof(*iter
)) {
531 DBG("received tracepoint field list entry event_name %s event_loglevel %d field_name %s field_type %d",
539 int ustctl_tracer_version(int sock
, struct lttng_ust_tracer_version
*v
)
541 struct ustcomm_ust_msg lum
;
542 struct ustcomm_ust_reply lur
;
548 memset(&lum
, 0, sizeof(lum
));
549 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
550 lum
.cmd
= LTTNG_UST_TRACER_VERSION
;
551 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
554 memcpy(v
, &lur
.u
.version
, sizeof(*v
));
555 DBG("received tracer version");
559 int ustctl_wait_quiescent(int sock
)
561 struct ustcomm_ust_msg lum
;
562 struct ustcomm_ust_reply lur
;
565 memset(&lum
, 0, sizeof(lum
));
566 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
567 lum
.cmd
= LTTNG_UST_WAIT_QUIESCENT
;
568 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
571 DBG("waited for quiescent state");
575 int ustctl_calibrate(int sock
, struct lttng_ust_calibrate
*calibrate
)
583 int ustctl_sock_flush_buffer(int sock
, struct lttng_ust_object_data
*object
)
585 struct ustcomm_ust_msg lum
;
586 struct ustcomm_ust_reply lur
;
592 memset(&lum
, 0, sizeof(lum
));
593 lum
.handle
= object
->handle
;
594 lum
.cmd
= LTTNG_UST_FLUSH_BUFFER
;
595 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
598 DBG("flushed buffer handle %u", object
->handle
);
602 /* Buffer operations */
604 /* Map channel shm into process memory */
605 struct lttng_ust_shm_handle
*ustctl_map_channel(struct lttng_ust_object_data
*chan_data
)
607 struct lttng_ust_shm_handle
*handle
;
608 struct channel
*chan
;
610 struct lttng_ust_lib_ring_buffer_config
*config
;
616 handle
= channel_handle_create(chan_data
->shm_fd
,
618 chan_data
->memory_map_size
);
620 ERR("create handle error");
624 * Set to -1, and then close the shm fd, and set the handle shm
625 * fd to -1 too. We don't need the shm fds after they have been
627 * The wait_fd is set to -1 in chan_data because it is now owned
630 chan_data
->shm_fd
= -1;
631 chan_data
->wait_fd
= -1;
633 /* chan is object 0. This is hardcoded. */
634 if (handle
->table
->objects
[0].shm_fd
>= 0) {
635 ret
= close(handle
->table
->objects
[0].shm_fd
);
637 perror("Error closing shm_fd");
639 handle
->table
->objects
[0].shm_fd
= -1;
643 * TODO: add consistency checks to be resilient if the
644 * application try to feed us with incoherent channel structure
647 chan
= shmp(handle
, handle
->chan
);
648 /* chan is object 0. This is hardcoded. */
649 chan_size
= handle
->table
->objects
[0].allocated_len
;
650 handle
->shadow_chan
= malloc(chan_size
);
651 if (!handle
->shadow_chan
) {
652 channel_destroy(chan
, handle
, 1);
655 memcpy(handle
->shadow_chan
, chan
, chan_size
);
657 * The callback pointers in the producer are invalid in the
658 * consumer. We need to look them up here.
660 config
= &handle
->shadow_chan
->backend
.config
;
661 switch (config
->client_type
) {
662 case LTTNG_CLIENT_METADATA
:
663 memcpy(&config
->cb
, lttng_client_callbacks_metadata
,
666 case LTTNG_CLIENT_DISCARD
:
667 memcpy(&config
->cb
, lttng_client_callbacks_discard
,
670 case LTTNG_CLIENT_OVERWRITE
:
671 memcpy(&config
->cb
, lttng_client_callbacks_overwrite
,
675 ERR("Unknown client type %d", config
->client_type
);
676 channel_destroy(chan
, handle
, 1);
679 /* Replace the object table pointer. */
680 ret
= munmap(handle
->table
->objects
[0].memory_map
,
681 handle
->table
->objects
[0].memory_map_size
);
686 handle
->table
->objects
[0].memory_map
= (char *) handle
->shadow_chan
;
687 handle
->table
->objects
[0].is_shadow
= 1;
691 /* Add stream to channel shm and map its shm into process memory */
692 int ustctl_add_stream(struct lttng_ust_shm_handle
*handle
,
693 struct lttng_ust_object_data
*stream_data
)
697 if (!handle
|| !stream_data
)
700 if (!stream_data
->handle
)
703 ret
= channel_handle_add_stream(handle
,
705 stream_data
->wait_fd
,
706 stream_data
->memory_map_size
);
708 ERR("add stream error\n");
712 * Set to -1 because the lttng_ust_shm_handle destruction will take care
713 * of closing shm_fd and wait_fd.
715 stream_data
->shm_fd
= -1;
716 stream_data
->wait_fd
= -1;
720 void ustctl_unmap_channel(struct lttng_ust_shm_handle
*handle
)
722 struct channel
*chan
;
725 chan
= shmp(handle
, handle
->chan
);
726 channel_destroy(chan
, handle
, 1);
730 * ustctl closes the shm_fd fds after mapping it.
732 struct lttng_ust_lib_ring_buffer
*ustctl_open_stream_read(struct lttng_ust_shm_handle
*handle
,
735 struct channel
*chan
;
736 int *shm_fd
, *wait_fd
;
737 uint64_t *memory_map_size
;
738 struct lttng_ust_lib_ring_buffer
*buf
;
744 chan
= handle
->shadow_chan
;
745 buf
= channel_get_ring_buffer(&chan
->backend
.config
,
746 chan
, cpu
, handle
, &shm_fd
, &wait_fd
, &memory_map_size
);
749 ret
= lib_ring_buffer_open_read(buf
, handle
, 1);
753 * We can close shm_fd early, right after is has been mapped.
756 ret
= close(*shm_fd
);
758 perror("Error closing shm_fd");
765 void ustctl_close_stream_read(struct lttng_ust_shm_handle
*handle
,
766 struct lttng_ust_lib_ring_buffer
*buf
)
768 assert(handle
&& buf
);
769 lib_ring_buffer_release_read(buf
, handle
, 1);
772 /* For mmap mode, readable without "get" operation */
774 void *ustctl_get_mmap_base(struct lttng_ust_shm_handle
*handle
,
775 struct lttng_ust_lib_ring_buffer
*buf
)
779 return shmp(handle
, buf
->backend
.memory_map
);
782 /* returns the length to mmap. */
783 int ustctl_get_mmap_len(struct lttng_ust_shm_handle
*handle
,
784 struct lttng_ust_lib_ring_buffer
*buf
,
787 unsigned long mmap_buf_len
;
788 struct channel
*chan
;
790 if (!handle
|| !buf
|| !len
)
793 chan
= handle
->shadow_chan
;
794 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
796 mmap_buf_len
= chan
->backend
.buf_size
;
797 if (chan
->backend
.extra_reader_sb
)
798 mmap_buf_len
+= chan
->backend
.subbuf_size
;
799 if (mmap_buf_len
> INT_MAX
)
805 /* returns the maximum size for sub-buffers. */
806 int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle
*handle
,
807 struct lttng_ust_lib_ring_buffer
*buf
,
810 struct channel
*chan
;
812 if (!handle
|| !buf
|| !len
)
815 chan
= handle
->shadow_chan
;
816 *len
= chan
->backend
.subbuf_size
;
821 * For mmap mode, operate on the current packet (between get/put or
822 * get_next/put_next).
825 /* returns the offset of the subbuffer belonging to the mmap reader. */
826 int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle
*handle
,
827 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *off
)
829 struct channel
*chan
;
830 unsigned long sb_bindex
;
832 if (!handle
|| !buf
|| !off
)
835 chan
= handle
->shadow_chan
;
836 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
838 sb_bindex
= subbuffer_id_get_index(&chan
->backend
.config
,
839 buf
->backend
.buf_rsb
.id
);
840 *off
= shmp(handle
, shmp_index(handle
, buf
->backend
.array
, sb_bindex
)->shmp
)->mmap_offset
;
844 /* returns the size of the current sub-buffer, without padding (for mmap). */
845 int ustctl_get_subbuf_size(struct lttng_ust_shm_handle
*handle
,
846 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *len
)
848 struct channel
*chan
;
850 if (!handle
|| !buf
|| !len
)
853 chan
= handle
->shadow_chan
;
854 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
859 /* returns the size of the current sub-buffer, without padding (for mmap). */
860 int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle
*handle
,
861 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *len
)
863 struct channel
*chan
;
865 if (!handle
|| !buf
|| !len
)
868 chan
= handle
->shadow_chan
;
869 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
871 *len
= PAGE_ALIGN(*len
);
875 /* Get exclusive read access to the next sub-buffer that can be read. */
876 int ustctl_get_next_subbuf(struct lttng_ust_shm_handle
*handle
,
877 struct lttng_ust_lib_ring_buffer
*buf
)
882 return lib_ring_buffer_get_next_subbuf(buf
, handle
);
886 /* Release exclusive sub-buffer access, move consumer forward. */
887 int ustctl_put_next_subbuf(struct lttng_ust_shm_handle
*handle
,
888 struct lttng_ust_lib_ring_buffer
*buf
)
893 lib_ring_buffer_put_next_subbuf(buf
, handle
);
899 /* Get a snapshot of the current ring buffer producer and consumer positions */
900 int ustctl_snapshot(struct lttng_ust_shm_handle
*handle
,
901 struct lttng_ust_lib_ring_buffer
*buf
)
906 return lib_ring_buffer_snapshot(buf
, &buf
->cons_snapshot
,
907 &buf
->prod_snapshot
, handle
);
910 /* Get the consumer position (iteration start) */
911 int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle
*handle
,
912 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
914 if (!handle
|| !buf
|| !pos
)
917 *pos
= buf
->cons_snapshot
;
921 /* Get the producer position (iteration end) */
922 int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle
*handle
,
923 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
925 if (!handle
|| !buf
|| !pos
)
928 *pos
= buf
->prod_snapshot
;
932 /* Get exclusive read access to the specified sub-buffer position */
933 int ustctl_get_subbuf(struct lttng_ust_shm_handle
*handle
,
934 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
936 if (!handle
|| !buf
|| !pos
)
939 return lib_ring_buffer_get_subbuf(buf
, *pos
, handle
);
942 /* Release exclusive sub-buffer access */
943 int ustctl_put_subbuf(struct lttng_ust_shm_handle
*handle
,
944 struct lttng_ust_lib_ring_buffer
*buf
)
949 lib_ring_buffer_put_subbuf(buf
, handle
);
953 void ustctl_flush_buffer(struct lttng_ust_shm_handle
*handle
,
954 struct lttng_ust_lib_ring_buffer
*buf
,
957 assert(handle
&& buf
);
958 lib_ring_buffer_switch_slow(buf
,
959 producer_active
? SWITCH_ACTIVE
: SWITCH_FLUSH
,