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
);
60 * If sock is negative, it means we don't have to notify the other side
61 * (e.g. application has already vanished).
63 int ustctl_release_object(int sock
, struct lttng_ust_object_data
*data
)
70 if (data
->shm_fd
>= 0) {
71 ret
= close(data
->shm_fd
);
77 if (data
->wait_fd
>= 0) {
78 ret
= close(data
->wait_fd
);
84 return ustctl_release_handle(sock
, data
->handle
);
88 * Send registration done packet to the application.
90 int ustctl_register_done(int sock
)
92 struct ustcomm_ust_msg lum
;
93 struct ustcomm_ust_reply lur
;
96 DBG("Sending register done command to %d", sock
);
97 memset(&lum
, 0, sizeof(lum
));
98 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
99 lum
.cmd
= LTTNG_UST_REGISTER_DONE
;
100 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
107 * returns session handle.
109 int ustctl_create_session(int sock
)
111 struct ustcomm_ust_msg lum
;
112 struct ustcomm_ust_reply lur
;
113 int ret
, session_handle
;
116 memset(&lum
, 0, sizeof(lum
));
117 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
118 lum
.cmd
= LTTNG_UST_SESSION
;
119 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
122 session_handle
= lur
.ret_val
;
123 DBG("received session handle %u", session_handle
);
124 return session_handle
;
127 /* open the metadata global channel */
128 int ustctl_open_metadata(int sock
, int session_handle
,
129 struct lttng_ust_channel_attr
*chops
,
130 struct lttng_ust_object_data
**_metadata_data
)
132 struct ustcomm_ust_msg lum
;
133 struct ustcomm_ust_reply lur
;
134 struct lttng_ust_object_data
*metadata_data
;
137 if (!chops
|| !_metadata_data
)
140 metadata_data
= malloc(sizeof(*metadata_data
));
143 init_object(metadata_data
);
144 /* Create metadata channel */
145 memset(&lum
, 0, sizeof(lum
));
146 lum
.handle
= session_handle
;
147 lum
.cmd
= LTTNG_UST_METADATA
;
148 lum
.u
.channel
.overwrite
= chops
->overwrite
;
149 lum
.u
.channel
.subbuf_size
= chops
->subbuf_size
;
150 lum
.u
.channel
.num_subbuf
= chops
->num_subbuf
;
151 lum
.u
.channel
.switch_timer_interval
= chops
->switch_timer_interval
;
152 lum
.u
.channel
.read_timer_interval
= chops
->read_timer_interval
;
153 lum
.u
.channel
.output
= chops
->output
;
154 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
159 metadata_data
->handle
= lur
.ret_val
;
160 DBG("received metadata handle %u", metadata_data
->handle
);
161 metadata_data
->memory_map_size
= lur
.u
.channel
.memory_map_size
;
163 ret
= ustcomm_recv_fd(sock
);
167 metadata_data
->shm_fd
= ret
;
169 * We need to get the second FD even if the first fails, because
170 * libust expects us to read the two FDs.
173 ret
= ustcomm_recv_fd(sock
);
177 metadata_data
->wait_fd
= ret
;
180 *_metadata_data
= metadata_data
;
184 (void) ustctl_release_object(sock
, metadata_data
);
189 int ustctl_create_channel(int sock
, int session_handle
,
190 struct lttng_ust_channel_attr
*chops
,
191 struct lttng_ust_object_data
**_channel_data
)
193 struct ustcomm_ust_msg lum
;
194 struct ustcomm_ust_reply lur
;
195 struct lttng_ust_object_data
*channel_data
;
198 if (!chops
|| !_channel_data
)
201 channel_data
= malloc(sizeof(*channel_data
));
204 init_object(channel_data
);
205 /* Create metadata channel */
206 memset(&lum
, 0, sizeof(lum
));
207 lum
.handle
= session_handle
;
208 lum
.cmd
= LTTNG_UST_CHANNEL
;
209 lum
.u
.channel
.overwrite
= chops
->overwrite
;
210 lum
.u
.channel
.subbuf_size
= chops
->subbuf_size
;
211 lum
.u
.channel
.num_subbuf
= chops
->num_subbuf
;
212 lum
.u
.channel
.switch_timer_interval
= chops
->switch_timer_interval
;
213 lum
.u
.channel
.read_timer_interval
= chops
->read_timer_interval
;
214 lum
.u
.channel
.output
= chops
->output
;
215 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
220 channel_data
->handle
= lur
.ret_val
;
221 DBG("received channel handle %u", channel_data
->handle
);
222 channel_data
->memory_map_size
= lur
.u
.channel
.memory_map_size
;
224 ret
= ustcomm_recv_fd(sock
);
228 channel_data
->shm_fd
= ret
;
230 * We need to get the second FD even if the first fails, because
231 * libust expects us to read the two FDs.
234 ret
= ustcomm_recv_fd(sock
);
238 channel_data
->wait_fd
= ret
;
241 *_channel_data
= channel_data
;
245 (void) ustctl_release_object(sock
, channel_data
);
251 * Return -ENOENT if no more stream is available for creation.
252 * Return 0 on success.
253 * Return negative error value on system error.
254 * Return positive error value on UST error.
256 int ustctl_create_stream(int sock
, struct lttng_ust_object_data
*channel_data
,
257 struct lttng_ust_object_data
**_stream_data
)
259 struct ustcomm_ust_msg lum
;
260 struct ustcomm_ust_reply lur
;
261 struct lttng_ust_object_data
*stream_data
;
262 int ret
, fd
, err
= 0;
264 if (!channel_data
|| !_stream_data
)
267 stream_data
= malloc(sizeof(*stream_data
));
270 init_object(stream_data
);
271 memset(&lum
, 0, sizeof(lum
));
272 lum
.handle
= channel_data
->handle
;
273 lum
.cmd
= LTTNG_UST_STREAM
;
274 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
279 stream_data
->handle
= lur
.ret_val
;
280 DBG("received stream handle %u", stream_data
->handle
);
281 stream_data
->memory_map_size
= lur
.u
.stream
.memory_map_size
;
283 fd
= ustcomm_recv_fd(sock
);
287 stream_data
->shm_fd
= fd
;
289 * We need to get the second FD even if the first fails, because
290 * libust expects us to read the two FDs.
293 fd
= ustcomm_recv_fd(sock
);
297 stream_data
->wait_fd
= fd
;
300 *_stream_data
= stream_data
;
304 (void) ustctl_release_object(sock
, stream_data
);
309 int ustctl_create_event(int sock
, struct lttng_ust_event
*ev
,
310 struct lttng_ust_object_data
*channel_data
,
311 struct lttng_ust_object_data
**_event_data
)
313 struct ustcomm_ust_msg lum
;
314 struct ustcomm_ust_reply lur
;
315 struct lttng_ust_object_data
*event_data
;
318 if (!channel_data
|| !_event_data
)
321 event_data
= malloc(sizeof(*event_data
));
324 init_object(event_data
);
325 memset(&lum
, 0, sizeof(lum
));
326 lum
.handle
= channel_data
->handle
;
327 lum
.cmd
= LTTNG_UST_EVENT
;
328 strncpy(lum
.u
.event
.name
, ev
->name
,
329 LTTNG_UST_SYM_NAME_LEN
);
330 lum
.u
.event
.instrumentation
= ev
->instrumentation
;
331 lum
.u
.event
.loglevel_type
= ev
->loglevel_type
;
332 lum
.u
.event
.loglevel
= ev
->loglevel
;
333 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
338 event_data
->handle
= lur
.ret_val
;
339 DBG("received event handle %u", event_data
->handle
);
340 *_event_data
= event_data
;
344 int ustctl_add_context(int sock
, struct lttng_ust_context
*ctx
,
345 struct lttng_ust_object_data
*obj_data
,
346 struct lttng_ust_object_data
**_context_data
)
348 struct ustcomm_ust_msg lum
;
349 struct ustcomm_ust_reply lur
;
350 struct lttng_ust_object_data
*context_data
;
353 if (!obj_data
|| !_context_data
)
356 context_data
= malloc(sizeof(*context_data
));
359 init_object(context_data
);
360 memset(&lum
, 0, sizeof(lum
));
361 lum
.handle
= obj_data
->handle
;
362 lum
.cmd
= LTTNG_UST_CONTEXT
;
363 lum
.u
.context
.ctx
= ctx
->ctx
;
364 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
369 context_data
->handle
= lur
.ret_val
;
370 DBG("received context handle %u", context_data
->handle
);
371 *_context_data
= context_data
;
375 int ustctl_set_filter(int sock
, struct lttng_ust_filter_bytecode
*bytecode
,
376 struct lttng_ust_object_data
*obj_data
)
378 struct ustcomm_ust_msg lum
;
379 struct ustcomm_ust_reply lur
;
385 memset(&lum
, 0, sizeof(lum
));
386 lum
.handle
= obj_data
->handle
;
387 lum
.cmd
= LTTNG_UST_FILTER
;
388 lum
.u
.filter
.data_size
= bytecode
->len
;
389 lum
.u
.filter
.reloc_offset
= bytecode
->reloc_offset
;
391 ret
= ustcomm_send_app_msg(sock
, &lum
);
394 /* send var len bytecode */
395 ret
= ustcomm_send_unix_sock(sock
, bytecode
->data
,
398 if (ret
== -ECONNRESET
)
399 fprintf(stderr
, "remote end closed connection\n");
402 if (ret
!= bytecode
->len
)
404 return ustcomm_recv_app_reply(sock
, &lur
, lum
.handle
, lum
.cmd
);
407 /* Enable event, channel and session ioctl */
408 int ustctl_enable(int sock
, struct lttng_ust_object_data
*object
)
410 struct ustcomm_ust_msg lum
;
411 struct ustcomm_ust_reply lur
;
417 memset(&lum
, 0, sizeof(lum
));
418 lum
.handle
= object
->handle
;
419 lum
.cmd
= LTTNG_UST_ENABLE
;
420 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
423 DBG("enabled handle %u", object
->handle
);
427 /* Disable event, channel and session ioctl */
428 int ustctl_disable(int sock
, struct lttng_ust_object_data
*object
)
430 struct ustcomm_ust_msg lum
;
431 struct ustcomm_ust_reply lur
;
437 memset(&lum
, 0, sizeof(lum
));
438 lum
.handle
= object
->handle
;
439 lum
.cmd
= LTTNG_UST_DISABLE
;
440 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
443 DBG("disable handle %u", object
->handle
);
447 int ustctl_start_session(int sock
, int handle
)
449 struct lttng_ust_object_data obj
;
452 return ustctl_enable(sock
, &obj
);
455 int ustctl_stop_session(int sock
, int handle
)
457 struct lttng_ust_object_data obj
;
460 return ustctl_disable(sock
, &obj
);
463 int ustctl_tracepoint_list(int sock
)
465 struct ustcomm_ust_msg lum
;
466 struct ustcomm_ust_reply lur
;
467 int ret
, tp_list_handle
;
469 memset(&lum
, 0, sizeof(lum
));
470 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
471 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST
;
472 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
475 tp_list_handle
= lur
.ret_val
;
476 DBG("received tracepoint list handle %u", tp_list_handle
);
477 return tp_list_handle
;
480 int ustctl_tracepoint_list_get(int sock
, int tp_list_handle
,
481 struct lttng_ust_tracepoint_iter
*iter
)
483 struct ustcomm_ust_msg lum
;
484 struct ustcomm_ust_reply lur
;
490 memset(&lum
, 0, sizeof(lum
));
491 lum
.handle
= tp_list_handle
;
492 lum
.cmd
= LTTNG_UST_TRACEPOINT_LIST_GET
;
493 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
496 DBG("received tracepoint list entry name %s loglevel %d",
497 lur
.u
.tracepoint
.name
,
498 lur
.u
.tracepoint
.loglevel
);
499 memcpy(iter
, &lur
.u
.tracepoint
, sizeof(*iter
));
503 int ustctl_tracepoint_field_list(int sock
)
505 struct ustcomm_ust_msg lum
;
506 struct ustcomm_ust_reply lur
;
507 int ret
, tp_field_list_handle
;
509 memset(&lum
, 0, sizeof(lum
));
510 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
511 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST
;
512 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
515 tp_field_list_handle
= lur
.ret_val
;
516 DBG("received tracepoint field list handle %u", tp_field_list_handle
);
517 return tp_field_list_handle
;
520 int ustctl_tracepoint_field_list_get(int sock
, int tp_field_list_handle
,
521 struct lttng_ust_field_iter
*iter
)
523 struct ustcomm_ust_msg lum
;
524 struct ustcomm_ust_reply lur
;
531 memset(&lum
, 0, sizeof(lum
));
532 lum
.handle
= tp_field_list_handle
;
533 lum
.cmd
= LTTNG_UST_TRACEPOINT_FIELD_LIST_GET
;
534 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
537 len
= ustcomm_recv_unix_sock(sock
, iter
, sizeof(*iter
));
538 if (len
!= sizeof(*iter
)) {
541 DBG("received tracepoint field list entry event_name %s event_loglevel %d field_name %s field_type %d",
549 int ustctl_tracer_version(int sock
, struct lttng_ust_tracer_version
*v
)
551 struct ustcomm_ust_msg lum
;
552 struct ustcomm_ust_reply lur
;
558 memset(&lum
, 0, sizeof(lum
));
559 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
560 lum
.cmd
= LTTNG_UST_TRACER_VERSION
;
561 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
564 memcpy(v
, &lur
.u
.version
, sizeof(*v
));
565 DBG("received tracer version");
569 int ustctl_wait_quiescent(int sock
)
571 struct ustcomm_ust_msg lum
;
572 struct ustcomm_ust_reply lur
;
575 memset(&lum
, 0, sizeof(lum
));
576 lum
.handle
= LTTNG_UST_ROOT_HANDLE
;
577 lum
.cmd
= LTTNG_UST_WAIT_QUIESCENT
;
578 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
581 DBG("waited for quiescent state");
585 int ustctl_calibrate(int sock
, struct lttng_ust_calibrate
*calibrate
)
593 int ustctl_sock_flush_buffer(int sock
, struct lttng_ust_object_data
*object
)
595 struct ustcomm_ust_msg lum
;
596 struct ustcomm_ust_reply lur
;
602 memset(&lum
, 0, sizeof(lum
));
603 lum
.handle
= object
->handle
;
604 lum
.cmd
= LTTNG_UST_FLUSH_BUFFER
;
605 ret
= ustcomm_send_app_cmd(sock
, &lum
, &lur
);
608 DBG("flushed buffer handle %u", object
->handle
);
612 /* Buffer operations */
614 /* Map channel shm into process memory */
615 struct lttng_ust_shm_handle
*ustctl_map_channel(struct lttng_ust_object_data
*chan_data
)
617 struct lttng_ust_shm_handle
*handle
;
618 struct channel
*chan
;
620 struct lttng_ust_lib_ring_buffer_config
*config
;
626 handle
= channel_handle_create(chan_data
->shm_fd
,
628 chan_data
->memory_map_size
);
630 ERR("create handle error");
634 * Set to -1, and then close the shm fd, and set the handle shm
635 * fd to -1 too. We don't need the shm fds after they have been
637 * The wait_fd is set to -1 in chan_data because it is now owned
640 chan_data
->shm_fd
= -1;
641 chan_data
->wait_fd
= -1;
643 /* chan is object 0. This is hardcoded. */
644 if (handle
->table
->objects
[0].shm_fd
>= 0) {
645 ret
= close(handle
->table
->objects
[0].shm_fd
);
647 perror("Error closing shm_fd");
649 handle
->table
->objects
[0].shm_fd
= -1;
653 * TODO: add consistency checks to be resilient if the
654 * application try to feed us with incoherent channel structure
657 chan
= shmp(handle
, handle
->chan
);
658 /* chan is object 0. This is hardcoded. */
659 chan_size
= handle
->table
->objects
[0].allocated_len
;
660 handle
->shadow_chan
= malloc(chan_size
);
661 if (!handle
->shadow_chan
) {
662 channel_destroy(chan
, handle
, 1);
665 memcpy(handle
->shadow_chan
, chan
, chan_size
);
667 * The callback pointers in the producer are invalid in the
668 * consumer. We need to look them up here.
670 config
= &handle
->shadow_chan
->backend
.config
;
671 switch (config
->client_type
) {
672 case LTTNG_CLIENT_METADATA
:
673 memcpy(&config
->cb
, lttng_client_callbacks_metadata
,
676 case LTTNG_CLIENT_DISCARD
:
677 memcpy(&config
->cb
, lttng_client_callbacks_discard
,
680 case LTTNG_CLIENT_OVERWRITE
:
681 memcpy(&config
->cb
, lttng_client_callbacks_overwrite
,
685 ERR("Unknown client type %d", config
->client_type
);
686 channel_destroy(chan
, handle
, 1);
689 /* Replace the object table pointer. */
690 ret
= munmap(handle
->table
->objects
[0].memory_map
,
691 handle
->table
->objects
[0].memory_map_size
);
696 handle
->table
->objects
[0].memory_map
= (char *) handle
->shadow_chan
;
697 handle
->table
->objects
[0].is_shadow
= 1;
701 /* Add stream to channel shm and map its shm into process memory */
702 int ustctl_add_stream(struct lttng_ust_shm_handle
*handle
,
703 struct lttng_ust_object_data
*stream_data
)
707 if (!handle
|| !stream_data
)
710 if (!stream_data
->handle
)
713 ret
= channel_handle_add_stream(handle
,
715 stream_data
->wait_fd
,
716 stream_data
->memory_map_size
);
718 ERR("add stream error\n");
722 * Set to -1 because the lttng_ust_shm_handle destruction will take care
723 * of closing shm_fd and wait_fd.
725 stream_data
->shm_fd
= -1;
726 stream_data
->wait_fd
= -1;
730 void ustctl_unmap_channel(struct lttng_ust_shm_handle
*handle
)
732 struct channel
*chan
;
735 chan
= shmp(handle
, handle
->chan
);
736 channel_destroy(chan
, handle
, 1);
740 * ustctl closes the shm_fd fds after mapping it.
742 struct lttng_ust_lib_ring_buffer
*ustctl_open_stream_read(struct lttng_ust_shm_handle
*handle
,
745 struct channel
*chan
;
746 int *shm_fd
, *wait_fd
;
747 uint64_t *memory_map_size
;
748 struct lttng_ust_lib_ring_buffer
*buf
;
754 chan
= handle
->shadow_chan
;
755 buf
= channel_get_ring_buffer(&chan
->backend
.config
,
756 chan
, cpu
, handle
, &shm_fd
, &wait_fd
, &memory_map_size
);
759 ret
= lib_ring_buffer_open_read(buf
, handle
, 1);
763 * We can close shm_fd early, right after is has been mapped.
766 ret
= close(*shm_fd
);
768 perror("Error closing shm_fd");
775 void ustctl_close_stream_read(struct lttng_ust_shm_handle
*handle
,
776 struct lttng_ust_lib_ring_buffer
*buf
)
778 assert(handle
&& buf
);
779 lib_ring_buffer_release_read(buf
, handle
, 1);
782 /* For mmap mode, readable without "get" operation */
784 void *ustctl_get_mmap_base(struct lttng_ust_shm_handle
*handle
,
785 struct lttng_ust_lib_ring_buffer
*buf
)
789 return shmp(handle
, buf
->backend
.memory_map
);
792 /* returns the length to mmap. */
793 int ustctl_get_mmap_len(struct lttng_ust_shm_handle
*handle
,
794 struct lttng_ust_lib_ring_buffer
*buf
,
797 unsigned long mmap_buf_len
;
798 struct channel
*chan
;
800 if (!handle
|| !buf
|| !len
)
803 chan
= handle
->shadow_chan
;
804 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
806 mmap_buf_len
= chan
->backend
.buf_size
;
807 if (chan
->backend
.extra_reader_sb
)
808 mmap_buf_len
+= chan
->backend
.subbuf_size
;
809 if (mmap_buf_len
> INT_MAX
)
815 /* returns the maximum size for sub-buffers. */
816 int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle
*handle
,
817 struct lttng_ust_lib_ring_buffer
*buf
,
820 struct channel
*chan
;
822 if (!handle
|| !buf
|| !len
)
825 chan
= handle
->shadow_chan
;
826 *len
= chan
->backend
.subbuf_size
;
831 * For mmap mode, operate on the current packet (between get/put or
832 * get_next/put_next).
835 /* returns the offset of the subbuffer belonging to the mmap reader. */
836 int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle
*handle
,
837 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *off
)
839 struct channel
*chan
;
840 unsigned long sb_bindex
;
842 if (!handle
|| !buf
|| !off
)
845 chan
= handle
->shadow_chan
;
846 if (chan
->backend
.config
.output
!= RING_BUFFER_MMAP
)
848 sb_bindex
= subbuffer_id_get_index(&chan
->backend
.config
,
849 buf
->backend
.buf_rsb
.id
);
850 *off
= shmp(handle
, shmp_index(handle
, buf
->backend
.array
, sb_bindex
)->shmp
)->mmap_offset
;
854 /* returns the size of the current sub-buffer, without padding (for mmap). */
855 int ustctl_get_subbuf_size(struct lttng_ust_shm_handle
*handle
,
856 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *len
)
858 struct channel
*chan
;
860 if (!handle
|| !buf
|| !len
)
863 chan
= handle
->shadow_chan
;
864 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
869 /* returns the size of the current sub-buffer, without padding (for mmap). */
870 int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle
*handle
,
871 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *len
)
873 struct channel
*chan
;
875 if (!handle
|| !buf
|| !len
)
878 chan
= handle
->shadow_chan
;
879 *len
= lib_ring_buffer_get_read_data_size(&chan
->backend
.config
, buf
,
881 *len
= PAGE_ALIGN(*len
);
885 /* Get exclusive read access to the next sub-buffer that can be read. */
886 int ustctl_get_next_subbuf(struct lttng_ust_shm_handle
*handle
,
887 struct lttng_ust_lib_ring_buffer
*buf
)
892 return lib_ring_buffer_get_next_subbuf(buf
, handle
);
896 /* Release exclusive sub-buffer access, move consumer forward. */
897 int ustctl_put_next_subbuf(struct lttng_ust_shm_handle
*handle
,
898 struct lttng_ust_lib_ring_buffer
*buf
)
903 lib_ring_buffer_put_next_subbuf(buf
, handle
);
909 /* Get a snapshot of the current ring buffer producer and consumer positions */
910 int ustctl_snapshot(struct lttng_ust_shm_handle
*handle
,
911 struct lttng_ust_lib_ring_buffer
*buf
)
916 return lib_ring_buffer_snapshot(buf
, &buf
->cons_snapshot
,
917 &buf
->prod_snapshot
, handle
);
920 /* Get the consumer position (iteration start) */
921 int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle
*handle
,
922 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
924 if (!handle
|| !buf
|| !pos
)
927 *pos
= buf
->cons_snapshot
;
931 /* Get the producer position (iteration end) */
932 int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle
*handle
,
933 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
935 if (!handle
|| !buf
|| !pos
)
938 *pos
= buf
->prod_snapshot
;
942 /* Get exclusive read access to the specified sub-buffer position */
943 int ustctl_get_subbuf(struct lttng_ust_shm_handle
*handle
,
944 struct lttng_ust_lib_ring_buffer
*buf
, unsigned long *pos
)
946 if (!handle
|| !buf
|| !pos
)
949 return lib_ring_buffer_get_subbuf(buf
, *pos
, handle
);
952 /* Release exclusive sub-buffer access */
953 int ustctl_put_subbuf(struct lttng_ust_shm_handle
*handle
,
954 struct lttng_ust_lib_ring_buffer
*buf
)
959 lib_ring_buffer_put_subbuf(buf
, handle
);
963 void ustctl_flush_buffer(struct lttng_ust_shm_handle
*handle
,
964 struct lttng_ust_lib_ring_buffer
*buf
,
967 assert(handle
&& buf
);
968 lib_ring_buffer_switch_slow(buf
,
969 producer_active
? SWITCH_ACTIVE
: SWITCH_FLUSH
,