2 * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: GPL-2.0-only
10 #include "lttng/tracker.h"
12 #define __USE_LINUX_IOCTL_DEFS
13 #include <sys/ioctl.h>
15 #include <common/align.h>
16 #include <common/macros.h>
17 #include <common/compat/errno.h>
20 #include <common/time.h>
22 #include "kernel-ctl.h"
23 #include "kernel-ioctl.h"
25 #define LTTNG_IOCTL_CHECK(fildes, request, ...) \
27 int _ioctl_ret = ioctl(fildes, request, ##__VA_ARGS__); \
28 assert(_ioctl_ret <= 0); \
29 !_ioctl_ret ? 0 : -errno; \
32 #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) \
34 int _ioctl_ret = ioctl(fildes, request, ##__VA_ARGS__); \
35 _ioctl_ret >= 0 ? _ioctl_ret : -errno; \
39 * This flag indicates which version of the kernel ABI to use. The old
40 * ABI (namespace _old) does not support a 32-bit user-space when the
41 * kernel is 64-bit. The old ABI is kept here for compatibility but is
42 * deprecated and will be removed eventually.
44 static int lttng_kernel_use_old_abi
= -1;
47 * Execute the new or old ioctl depending on the ABI version.
48 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
49 * this function tests if the new ABI is available and otherwise fallbacks
51 * This function takes the fd on which the ioctl must be executed and the old
52 * and new request codes.
53 * It returns the return value of the ioctl executed.
55 static inline int compat_ioctl_no_arg(int fd
, unsigned long oldname
,
56 unsigned long newname
)
60 if (lttng_kernel_use_old_abi
== -1) {
61 ret
= LTTNG_IOCTL_NO_CHECK(fd
, newname
);
63 lttng_kernel_use_old_abi
= 0;
66 lttng_kernel_use_old_abi
= 1;
68 if (lttng_kernel_use_old_abi
) {
69 ret
= LTTNG_IOCTL_NO_CHECK(fd
, oldname
);
71 ret
= LTTNG_IOCTL_NO_CHECK(fd
, newname
);
78 int kernctl_create_session(int fd
)
80 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION
,
81 LTTNG_KERNEL_SESSION
);
84 /* open the metadata global channel */
85 int kernctl_open_metadata(int fd
, struct lttng_channel_attr
*chops
)
87 struct lttng_kernel_channel channel
;
89 if (lttng_kernel_use_old_abi
) {
90 struct lttng_kernel_old_channel old_channel
;
92 memset(&old_channel
, 0, sizeof(old_channel
));
93 old_channel
.overwrite
= chops
->overwrite
;
94 old_channel
.subbuf_size
= chops
->subbuf_size
;
95 old_channel
.num_subbuf
= chops
->num_subbuf
;
96 old_channel
.switch_timer_interval
= chops
->switch_timer_interval
;
97 old_channel
.read_timer_interval
= chops
->read_timer_interval
;
98 old_channel
.output
= chops
->output
;
100 memset(old_channel
.padding
, 0, sizeof(old_channel
.padding
));
102 * The new channel padding is smaller than the old ABI so we use the
103 * new ABI padding size for the memcpy.
105 memcpy(old_channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
107 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_METADATA
,
111 memset(&channel
, 0, sizeof(channel
));
112 channel
.overwrite
= chops
->overwrite
;
113 channel
.subbuf_size
= chops
->subbuf_size
;
114 channel
.num_subbuf
= chops
->num_subbuf
;
115 channel
.switch_timer_interval
= chops
->switch_timer_interval
;
116 channel
.read_timer_interval
= chops
->read_timer_interval
;
117 channel
.output
= chops
->output
;
118 memcpy(channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
120 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_METADATA
, &channel
);
123 int kernctl_create_channel(int fd
, struct lttng_channel_attr
*chops
)
125 struct lttng_kernel_channel channel
;
127 memset(&channel
, 0, sizeof(channel
));
128 if (lttng_kernel_use_old_abi
) {
129 struct lttng_kernel_old_channel old_channel
;
131 old_channel
.overwrite
= chops
->overwrite
;
132 old_channel
.subbuf_size
= chops
->subbuf_size
;
133 old_channel
.num_subbuf
= chops
->num_subbuf
;
134 old_channel
.switch_timer_interval
= chops
->switch_timer_interval
;
135 old_channel
.read_timer_interval
= chops
->read_timer_interval
;
136 old_channel
.output
= chops
->output
;
138 memset(old_channel
.padding
, 0, sizeof(old_channel
.padding
));
140 * The new channel padding is smaller than the old ABI so we use the
141 * new ABI padding size for the memcpy.
143 memcpy(old_channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
145 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_CHANNEL
,
149 channel
.overwrite
= chops
->overwrite
;
150 channel
.subbuf_size
= chops
->subbuf_size
;
151 channel
.num_subbuf
= chops
->num_subbuf
;
152 channel
.switch_timer_interval
= chops
->switch_timer_interval
;
153 channel
.read_timer_interval
= chops
->read_timer_interval
;
154 channel
.output
= chops
->output
;
155 memcpy(channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
157 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_CHANNEL
, &channel
);
160 int kernctl_syscall_mask(int fd
, char **syscall_mask
, uint32_t *nr_bits
)
162 struct lttng_kernel_syscall_mask kmask_len
, *kmask
= NULL
;
163 size_t array_alloc_len
;
178 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SYSCALL_MASK
, &kmask_len
);
183 array_alloc_len
= ALIGN(kmask_len
.len
, 8) >> 3;
185 kmask
= zmalloc(sizeof(*kmask
) + array_alloc_len
);
191 kmask
->len
= kmask_len
.len
;
192 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SYSCALL_MASK
, kmask
);
197 new_mask
= realloc(*syscall_mask
, array_alloc_len
);
202 memcpy(new_mask
, kmask
->mask
, array_alloc_len
);
203 *syscall_mask
= new_mask
;
204 *nr_bits
= kmask
->len
;
211 int kernctl_track_pid(int fd
, int pid
)
213 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_TRACK_PID
, pid
);
216 int kernctl_untrack_pid(int fd
, int pid
)
218 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_UNTRACK_PID
, pid
);
221 int kernctl_list_tracker_pids(int fd
)
223 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
);
226 static enum lttng_kernel_tracker_type
get_kernel_tracker_type(
227 enum lttng_process_attr process_attr
)
229 switch (process_attr
) {
230 case LTTNG_PROCESS_ATTR_PROCESS_ID
:
231 return LTTNG_KERNEL_TRACKER_PID
;
232 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID
:
233 return LTTNG_KERNEL_TRACKER_VPID
;
234 case LTTNG_PROCESS_ATTR_USER_ID
:
235 return LTTNG_KERNEL_TRACKER_UID
;
236 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID
:
237 return LTTNG_KERNEL_TRACKER_VUID
;
238 case LTTNG_PROCESS_ATTR_GROUP_ID
:
239 return LTTNG_KERNEL_TRACKER_GID
;
240 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID
:
241 return LTTNG_KERNEL_TRACKER_VGID
;
243 return LTTNG_KERNEL_TRACKER_UNKNOWN
;
247 int kernctl_track_id(int fd
, enum lttng_process_attr process_attr
, int id
)
249 struct lttng_kernel_tracker_args args
;
252 args
.type
= get_kernel_tracker_type(process_attr
);
253 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
257 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_TRACK_ID
, &args
);
260 int kernctl_untrack_id(int fd
, enum lttng_process_attr process_attr
, int id
)
262 struct lttng_kernel_tracker_args args
;
265 args
.type
= get_kernel_tracker_type(process_attr
);
266 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
270 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_UNTRACK_ID
, &args
);
273 int kernctl_list_tracker_ids(int fd
, enum lttng_process_attr process_attr
)
275 struct lttng_kernel_tracker_args args
;
278 args
.type
= get_kernel_tracker_type(process_attr
);
279 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
283 return LTTNG_IOCTL_NO_CHECK(
284 fd
, LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS
, &args
);
287 int kernctl_session_regenerate_metadata(int fd
)
289 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_METADATA_REGEN
);
292 int kernctl_session_regenerate_statedump(int fd
)
294 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_STATEDUMP
);
297 int kernctl_session_set_name(int fd
, const char *name
)
300 struct lttng_kernel_session_name session_name
;
302 ret
= lttng_strncpy(session_name
.name
, name
, sizeof(session_name
.name
));
307 ret
= LTTNG_IOCTL_CHECK(
308 fd
, LTTNG_KERNEL_SESSION_SET_NAME
, &session_name
);
313 int kernctl_session_set_creation_time(int fd
, time_t time
)
316 struct lttng_kernel_session_creation_time creation_time
;
318 ret
= time_to_iso8601_str(time
, creation_time
.iso8601
,
319 sizeof(creation_time
.iso8601
));
324 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_SET_CREATION_TIME
,
330 int kernctl_create_stream(int fd
)
332 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_STREAM
,
333 LTTNG_KERNEL_STREAM
);
336 int kernctl_create_event(int fd
, struct lttng_kernel_event
*ev
)
338 if (lttng_kernel_use_old_abi
) {
339 struct lttng_kernel_old_event old_event
;
341 memset(&old_event
, 0, sizeof(old_event
));
342 memcpy(old_event
.name
, ev
->name
, sizeof(old_event
.name
));
343 old_event
.instrumentation
= ev
->instrumentation
;
344 switch (ev
->instrumentation
) {
345 case LTTNG_KERNEL_KPROBE
:
346 old_event
.u
.kprobe
.addr
= ev
->u
.kprobe
.addr
;
347 old_event
.u
.kprobe
.offset
= ev
->u
.kprobe
.offset
;
348 memcpy(old_event
.u
.kprobe
.symbol_name
,
349 ev
->u
.kprobe
.symbol_name
,
350 sizeof(old_event
.u
.kprobe
.symbol_name
));
352 case LTTNG_KERNEL_KRETPROBE
:
353 old_event
.u
.kretprobe
.addr
= ev
->u
.kretprobe
.addr
;
354 old_event
.u
.kretprobe
.offset
= ev
->u
.kretprobe
.offset
;
355 memcpy(old_event
.u
.kretprobe
.symbol_name
,
356 ev
->u
.kretprobe
.symbol_name
,
357 sizeof(old_event
.u
.kretprobe
.symbol_name
));
359 case LTTNG_KERNEL_FUNCTION
:
360 memcpy(old_event
.u
.ftrace
.symbol_name
,
361 ev
->u
.ftrace
.symbol_name
,
362 sizeof(old_event
.u
.ftrace
.symbol_name
));
368 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_EVENT
,
371 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_EVENT
, ev
);
374 int kernctl_add_context(int fd
, struct lttng_kernel_context
*ctx
)
376 if (lttng_kernel_use_old_abi
) {
377 struct lttng_kernel_old_context old_ctx
;
379 memset(&old_ctx
, 0, sizeof(old_ctx
));
380 old_ctx
.ctx
= ctx
->ctx
;
381 /* only type that uses the union */
382 if (ctx
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER
) {
383 old_ctx
.u
.perf_counter
.type
=
384 ctx
->u
.perf_counter
.type
;
385 old_ctx
.u
.perf_counter
.config
=
386 ctx
->u
.perf_counter
.config
;
387 memcpy(old_ctx
.u
.perf_counter
.name
,
388 ctx
->u
.perf_counter
.name
,
389 sizeof(old_ctx
.u
.perf_counter
.name
));
391 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_OLD_CONTEXT
, &old_ctx
);
393 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_CONTEXT
, ctx
);
397 /* Enable event, channel and session LTTNG_IOCTL_CHECK */
398 int kernctl_enable(int fd
)
400 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_ENABLE
,
401 LTTNG_KERNEL_ENABLE
);
404 /* Disable event, channel and session LTTNG_IOCTL_CHECK */
405 int kernctl_disable(int fd
)
407 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_DISABLE
,
408 LTTNG_KERNEL_DISABLE
);
411 int kernctl_start_session(int fd
)
413 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION_START
,
414 LTTNG_KERNEL_SESSION_START
);
417 int kernctl_stop_session(int fd
)
419 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION_STOP
,
420 LTTNG_KERNEL_SESSION_STOP
);
423 int kernctl_create_event_notifier_group(int fd
)
425 return LTTNG_IOCTL_NO_CHECK(fd
,
426 LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE
);
429 int kernctl_create_event_notifier_group_notification_fd(int group_fd
)
431 return LTTNG_IOCTL_NO_CHECK(group_fd
,
432 LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD
);
435 int kernctl_create_event_notifier_group_error_counter(int group_fd
,
436 const struct lttng_kernel_counter_conf
*error_counter_conf
)
438 return LTTNG_IOCTL_NO_CHECK(group_fd
, LTTNG_KERNEL_COUNTER
,
442 int kernctl_counter_get_aggregate_value(int counter_fd
,
443 struct lttng_kernel_counter_aggregate
*value
)
445 return LTTNG_IOCTL_NO_CHECK(counter_fd
, LTTNG_KERNEL_COUNTER_AGGREGATE
,
449 int kernctl_counter_clear(int counter_fd
,
450 struct lttng_kernel_counter_clear
*clear
)
452 return LTTNG_IOCTL_NO_CHECK(counter_fd
, LTTNG_KERNEL_COUNTER_CLEAR
,
456 int kernctl_create_event_notifier(int group_fd
,
457 const struct lttng_kernel_event_notifier
*event_notifier
)
459 return LTTNG_IOCTL_NO_CHECK(group_fd
,
460 LTTNG_KERNEL_EVENT_NOTIFIER_CREATE
, event_notifier
);
463 int kernctl_capture(int fd
, const struct lttng_bytecode
*capture
)
466 struct lttng_kernel_capture_bytecode
*kb
;
468 /* Translate bytecode to kernel bytecode. */
469 kb
= zmalloc(sizeof(*kb
) + capture
->len
);
475 kb
->len
= capture
->len
;
476 kb
->reloc_offset
= capture
->reloc_table_offset
;
477 kb
->seqnum
= capture
->seqnum
;
478 memcpy(kb
->data
, capture
->data
, capture
->len
);
479 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_CAPTURE
, kb
);
485 int kernctl_filter(int fd
, const struct lttng_bytecode
*filter
)
487 struct lttng_kernel_filter_bytecode
*kb
;
491 /* Translate bytecode to kernel bytecode */
492 kb
= zmalloc(sizeof(*kb
) + filter
->len
);
495 kb
->len
= len
= filter
->len
;
496 kb
->reloc_offset
= filter
->reloc_table_offset
;
497 kb
->seqnum
= filter
->seqnum
;
498 memcpy(kb
->data
, filter
->data
, len
);
499 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_FILTER
, kb
);
504 int kernctl_add_callsite(int fd
, struct lttng_kernel_event_callsite
*callsite
)
506 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_ADD_CALLSITE
, callsite
);
509 int kernctl_tracepoint_list(int fd
)
511 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_TRACEPOINT_LIST
,
512 LTTNG_KERNEL_TRACEPOINT_LIST
);
515 int kernctl_syscall_list(int fd
)
517 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_SYSCALL_LIST
);
520 int kernctl_tracer_version(int fd
, struct lttng_kernel_tracer_version
*v
)
524 if (lttng_kernel_use_old_abi
== -1) {
525 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_VERSION
, v
);
527 lttng_kernel_use_old_abi
= 0;
530 lttng_kernel_use_old_abi
= 1;
532 if (lttng_kernel_use_old_abi
) {
533 struct lttng_kernel_old_tracer_version old_v
;
535 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_OLD_TRACER_VERSION
, &old_v
);
539 v
->major
= old_v
.major
;
540 v
->minor
= old_v
.minor
;
541 v
->patchlevel
= old_v
.patchlevel
;
543 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_VERSION
, v
);
550 int kernctl_tracer_abi_version(int fd
,
551 struct lttng_kernel_tracer_abi_version
*v
)
553 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_ABI_VERSION
, v
);
556 int kernctl_wait_quiescent(int fd
)
558 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_WAIT_QUIESCENT
,
559 LTTNG_KERNEL_WAIT_QUIESCENT
);
562 int kernctl_buffer_flush(int fd
)
564 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_FLUSH
);
567 int kernctl_buffer_flush_empty(int fd
)
569 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_FLUSH_EMPTY
);
572 int kernctl_buffer_clear(int fd
)
574 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_CLEAR
);
577 int kernctl_get_next_subbuf_metadata_check(int fd
, bool *consistent
)
579 return LTTNG_IOCTL_NO_CHECK(fd
,
580 RING_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
,
584 /* returns the version of the metadata. */
585 int kernctl_get_metadata_version(int fd
, uint64_t *version
)
587 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_METADATA_VERSION
, version
);
590 int kernctl_metadata_cache_dump(int fd
)
592 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_METADATA_CACHE_DUMP
);
595 /* Buffer operations */
597 /* For mmap mode, readable without "get" operation */
599 /* returns the length to mmap. */
600 int kernctl_get_mmap_len(int fd
, unsigned long *len
)
602 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MMAP_LEN
, len
);
605 /* returns the maximum size for sub-buffers. */
606 int kernctl_get_max_subbuf_size(int fd
, unsigned long *len
)
608 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MAX_SUBBUF_SIZE
, len
);
612 * For mmap mode, operate on the current packet (between get/put or
613 * get_next/put_next).
616 /* returns the offset of the subbuffer belonging to the mmap reader. */
617 int kernctl_get_mmap_read_offset(int fd
, unsigned long *off
)
619 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MMAP_READ_OFFSET
, off
);
622 /* returns the size of the current sub-buffer, without padding (for mmap). */
623 int kernctl_get_subbuf_size(int fd
, unsigned long *len
)
625 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_SUBBUF_SIZE
, len
);
628 /* returns the size of the current sub-buffer, without padding (for mmap). */
629 int kernctl_get_padded_subbuf_size(int fd
, unsigned long *len
)
631 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_PADDED_SUBBUF_SIZE
, len
);
634 /* Get exclusive read access to the next sub-buffer that can be read. */
635 int kernctl_get_next_subbuf(int fd
)
637 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_NEXT_SUBBUF
);
641 /* Release exclusive sub-buffer access, move consumer forward. */
642 int kernctl_put_next_subbuf(int fd
)
644 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_PUT_NEXT_SUBBUF
);
649 /* Get a snapshot of the current ring buffer producer and consumer positions */
650 int kernctl_snapshot(int fd
)
652 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT
);
656 * Get a snapshot of the current ring buffer producer and consumer positions,
657 * regardless of whether or not the two positions are contained within the
660 int kernctl_snapshot_sample_positions(int fd
)
662 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS
);
665 /* Get the consumer position (iteration start) */
666 int kernctl_snapshot_get_consumed(int fd
, unsigned long *pos
)
668 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_GET_CONSUMED
, pos
);
671 /* Get the producer position (iteration end) */
672 int kernctl_snapshot_get_produced(int fd
, unsigned long *pos
)
674 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_GET_PRODUCED
, pos
);
677 /* Get exclusive read access to the specified sub-buffer position */
678 int kernctl_get_subbuf(int fd
, unsigned long *len
)
680 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_SUBBUF
, len
);
683 /* Release exclusive sub-buffer access */
684 int kernctl_put_subbuf(int fd
)
686 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_PUT_SUBBUF
);
689 /* Returns the timestamp begin of the current sub-buffer. */
690 int kernctl_get_timestamp_begin(int fd
, uint64_t *timestamp_begin
)
692 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
,
696 /* Returns the timestamp end of the current sub-buffer. */
697 int kernctl_get_timestamp_end(int fd
, uint64_t *timestamp_end
)
699 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_TIMESTAMP_END
,
703 /* Returns the number of discarded events in the current sub-buffer. */
704 int kernctl_get_events_discarded(int fd
, uint64_t *events_discarded
)
706 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
,
710 /* Returns the content size in the current sub-buffer. */
711 int kernctl_get_content_size(int fd
, uint64_t *content_size
)
713 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_CONTENT_SIZE
,
717 /* Returns the packet size in the current sub-buffer. */
718 int kernctl_get_packet_size(int fd
, uint64_t *packet_size
)
720 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_PACKET_SIZE
,
724 /* Returns the stream id of the current sub-buffer. */
725 int kernctl_get_stream_id(int fd
, uint64_t *stream_id
)
727 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_STREAM_ID
,
731 /* Returns the current timestamp. */
732 int kernctl_get_current_timestamp(int fd
, uint64_t *ts
)
734 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
,
738 /* Returns the packet sequence number of the current sub-buffer. */
739 int kernctl_get_sequence_number(int fd
, uint64_t *seq
)
741 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_SEQ_NUM
, seq
);
744 /* Returns the stream instance id. */
745 int kernctl_get_instance_id(int fd
, uint64_t *id
)
747 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_INSTANCE_ID
, id
);