2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #define __USE_LINUX_IOCTL_DEFS
22 #include <sys/ioctl.h>
24 #include <common/align.h>
25 #include <common/macros.h>
29 #include <common/time.h>
31 #include "kernel-ctl.h"
32 #include "kernel-ioctl.h"
34 #define LTTNG_IOCTL_CHECK(fildes, request, ...) ({ \
35 int ret = ioctl(fildes, request, ##__VA_ARGS__);\
40 #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({ \
41 int ret = ioctl(fildes, request, ##__VA_ARGS__);\
42 ret >= 0 ? ret : -errno; \
46 * This flag indicates which version of the kernel ABI to use. The old
47 * ABI (namespace _old) does not support a 32-bit user-space when the
48 * kernel is 64-bit. The old ABI is kept here for compatibility but is
49 * deprecated and will be removed eventually.
51 static int lttng_kernel_use_old_abi
= -1;
54 * Execute the new or old ioctl depending on the ABI version.
55 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
56 * this function tests if the new ABI is available and otherwise fallbacks
58 * This function takes the fd on which the ioctl must be executed and the old
59 * and new request codes.
60 * It returns the return value of the ioctl executed.
62 static inline int compat_ioctl_no_arg(int fd
, unsigned long oldname
,
63 unsigned long newname
)
67 if (lttng_kernel_use_old_abi
== -1) {
68 ret
= LTTNG_IOCTL_NO_CHECK(fd
, newname
);
70 lttng_kernel_use_old_abi
= 0;
73 lttng_kernel_use_old_abi
= 1;
75 if (lttng_kernel_use_old_abi
) {
76 ret
= LTTNG_IOCTL_NO_CHECK(fd
, oldname
);
78 ret
= LTTNG_IOCTL_NO_CHECK(fd
, newname
);
85 int kernctl_create_session(int fd
)
87 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION
,
88 LTTNG_KERNEL_SESSION
);
91 /* open the metadata global channel */
92 int kernctl_open_metadata(int fd
, struct lttng_channel_attr
*chops
)
94 struct lttng_kernel_channel channel
;
96 if (lttng_kernel_use_old_abi
) {
97 struct lttng_kernel_old_channel old_channel
;
99 memset(&old_channel
, 0, sizeof(old_channel
));
100 old_channel
.overwrite
= chops
->overwrite
;
101 old_channel
.subbuf_size
= chops
->subbuf_size
;
102 old_channel
.num_subbuf
= chops
->num_subbuf
;
103 old_channel
.switch_timer_interval
= chops
->switch_timer_interval
;
104 old_channel
.read_timer_interval
= chops
->read_timer_interval
;
105 old_channel
.output
= chops
->output
;
107 memset(old_channel
.padding
, 0, sizeof(old_channel
.padding
));
109 * The new channel padding is smaller than the old ABI so we use the
110 * new ABI padding size for the memcpy.
112 memcpy(old_channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
114 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_METADATA
,
118 memset(&channel
, 0, sizeof(channel
));
119 channel
.overwrite
= chops
->overwrite
;
120 channel
.subbuf_size
= chops
->subbuf_size
;
121 channel
.num_subbuf
= chops
->num_subbuf
;
122 channel
.switch_timer_interval
= chops
->switch_timer_interval
;
123 channel
.read_timer_interval
= chops
->read_timer_interval
;
124 channel
.output
= chops
->output
;
125 memcpy(channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
127 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_METADATA
, &channel
);
130 int kernctl_create_channel(int fd
, struct lttng_channel_attr
*chops
)
132 struct lttng_kernel_channel channel
;
134 memset(&channel
, 0, sizeof(channel
));
135 if (lttng_kernel_use_old_abi
) {
136 struct lttng_kernel_old_channel old_channel
;
138 old_channel
.overwrite
= chops
->overwrite
;
139 old_channel
.subbuf_size
= chops
->subbuf_size
;
140 old_channel
.num_subbuf
= chops
->num_subbuf
;
141 old_channel
.switch_timer_interval
= chops
->switch_timer_interval
;
142 old_channel
.read_timer_interval
= chops
->read_timer_interval
;
143 old_channel
.output
= chops
->output
;
145 memset(old_channel
.padding
, 0, sizeof(old_channel
.padding
));
147 * The new channel padding is smaller than the old ABI so we use the
148 * new ABI padding size for the memcpy.
150 memcpy(old_channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
152 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_CHANNEL
,
156 channel
.overwrite
= chops
->overwrite
;
157 channel
.subbuf_size
= chops
->subbuf_size
;
158 channel
.num_subbuf
= chops
->num_subbuf
;
159 channel
.switch_timer_interval
= chops
->switch_timer_interval
;
160 channel
.read_timer_interval
= chops
->read_timer_interval
;
161 channel
.output
= chops
->output
;
162 memcpy(channel
.padding
, chops
->padding
, sizeof(chops
->padding
));
164 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_CHANNEL
, &channel
);
167 int kernctl_syscall_mask(int fd
, char **syscall_mask
, uint32_t *nr_bits
)
169 struct lttng_kernel_syscall_mask kmask_len
, *kmask
= NULL
;
170 size_t array_alloc_len
;
185 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SYSCALL_MASK
, &kmask_len
);
190 array_alloc_len
= ALIGN(kmask_len
.len
, 8) >> 3;
192 kmask
= zmalloc(sizeof(*kmask
) + array_alloc_len
);
198 kmask
->len
= kmask_len
.len
;
199 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SYSCALL_MASK
, kmask
);
204 new_mask
= realloc(*syscall_mask
, array_alloc_len
);
209 memcpy(new_mask
, kmask
->mask
, array_alloc_len
);
210 *syscall_mask
= new_mask
;
211 *nr_bits
= kmask
->len
;
218 int kernctl_track_pid(int fd
, int pid
)
220 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_TRACK_PID
, pid
);
223 int kernctl_untrack_pid(int fd
, int pid
)
225 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_UNTRACK_PID
, pid
);
228 int kernctl_list_tracker_pids(int fd
)
230 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
);
233 static enum lttng_kernel_tracker_type
get_kernel_tracker_type(
234 enum lttng_tracker_type type
)
237 case LTTNG_TRACKER_PID
:
238 return LTTNG_KERNEL_TRACKER_PID
;
239 case LTTNG_TRACKER_VPID
:
240 return LTTNG_KERNEL_TRACKER_VPID
;
241 case LTTNG_TRACKER_UID
:
242 return LTTNG_KERNEL_TRACKER_UID
;
243 case LTTNG_TRACKER_VUID
:
244 return LTTNG_KERNEL_TRACKER_VUID
;
245 case LTTNG_TRACKER_GID
:
246 return LTTNG_KERNEL_TRACKER_GID
;
247 case LTTNG_TRACKER_VGID
:
248 return LTTNG_KERNEL_TRACKER_VGID
;
250 return LTTNG_KERNEL_TRACKER_UNKNOWN
;
254 int kernctl_track_id(int fd
, enum lttng_tracker_type tracker_type
, int id
)
256 struct lttng_kernel_tracker_args args
;
259 args
.type
= get_kernel_tracker_type(tracker_type
);
260 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
264 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_TRACK_ID
, &args
);
267 int kernctl_untrack_id(int fd
, enum lttng_tracker_type tracker_type
, int id
)
269 struct lttng_kernel_tracker_args args
;
272 args
.type
= get_kernel_tracker_type(tracker_type
);
273 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
277 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_UNTRACK_ID
, &args
);
280 int kernctl_list_tracker_ids(int fd
, enum lttng_tracker_type tracker_type
)
282 struct lttng_kernel_tracker_args args
;
285 args
.type
= get_kernel_tracker_type(tracker_type
);
286 if (args
.type
== LTTNG_KERNEL_TRACKER_UNKNOWN
) {
290 return LTTNG_IOCTL_NO_CHECK(
291 fd
, LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS
, &args
);
294 int kernctl_session_regenerate_metadata(int fd
)
296 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_METADATA_REGEN
);
299 int kernctl_session_regenerate_statedump(int fd
)
301 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_STATEDUMP
);
304 int kernctl_session_set_name(int fd
, const char *name
)
307 struct lttng_kernel_session_name session_name
;
309 ret
= lttng_strncpy(session_name
.name
, name
, sizeof(session_name
.name
));
314 ret
= LTTNG_IOCTL_CHECK(
315 fd
, LTTNG_KERNEL_SESSION_SET_NAME
, &session_name
);
320 int kernctl_session_set_creation_time(int fd
, time_t time
)
323 struct lttng_kernel_session_creation_time creation_time
;
325 ret
= time_to_iso8601_str(time
, creation_time
.iso8601
,
326 sizeof(creation_time
.iso8601
));
331 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_SESSION_SET_CREATION_TIME
,
337 int kernctl_create_stream(int fd
)
339 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_STREAM
,
340 LTTNG_KERNEL_STREAM
);
343 int kernctl_create_event(int fd
, struct lttng_kernel_event
*ev
)
345 if (lttng_kernel_use_old_abi
) {
346 struct lttng_kernel_old_event old_event
;
348 memset(&old_event
, 0, sizeof(old_event
));
349 memcpy(old_event
.name
, ev
->name
, sizeof(old_event
.name
));
350 old_event
.instrumentation
= ev
->instrumentation
;
351 switch (ev
->instrumentation
) {
352 case LTTNG_KERNEL_KPROBE
:
353 old_event
.u
.kprobe
.addr
= ev
->u
.kprobe
.addr
;
354 old_event
.u
.kprobe
.offset
= ev
->u
.kprobe
.offset
;
355 memcpy(old_event
.u
.kprobe
.symbol_name
,
356 ev
->u
.kprobe
.symbol_name
,
357 sizeof(old_event
.u
.kprobe
.symbol_name
));
359 case LTTNG_KERNEL_KRETPROBE
:
360 old_event
.u
.kretprobe
.addr
= ev
->u
.kretprobe
.addr
;
361 old_event
.u
.kretprobe
.offset
= ev
->u
.kretprobe
.offset
;
362 memcpy(old_event
.u
.kretprobe
.symbol_name
,
363 ev
->u
.kretprobe
.symbol_name
,
364 sizeof(old_event
.u
.kretprobe
.symbol_name
));
366 case LTTNG_KERNEL_FUNCTION
:
367 memcpy(old_event
.u
.ftrace
.symbol_name
,
368 ev
->u
.ftrace
.symbol_name
,
369 sizeof(old_event
.u
.ftrace
.symbol_name
));
375 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_OLD_EVENT
,
378 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_EVENT
, ev
);
381 int kernctl_add_context(int fd
, struct lttng_kernel_context
*ctx
)
383 if (lttng_kernel_use_old_abi
) {
384 struct lttng_kernel_old_context old_ctx
;
386 memset(&old_ctx
, 0, sizeof(old_ctx
));
387 old_ctx
.ctx
= ctx
->ctx
;
388 /* only type that uses the union */
389 if (ctx
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER
) {
390 old_ctx
.u
.perf_counter
.type
=
391 ctx
->u
.perf_counter
.type
;
392 old_ctx
.u
.perf_counter
.config
=
393 ctx
->u
.perf_counter
.config
;
394 memcpy(old_ctx
.u
.perf_counter
.name
,
395 ctx
->u
.perf_counter
.name
,
396 sizeof(old_ctx
.u
.perf_counter
.name
));
398 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_OLD_CONTEXT
, &old_ctx
);
400 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_CONTEXT
, ctx
);
404 /* Enable event, channel and session LTTNG_IOCTL_CHECK */
405 int kernctl_enable(int fd
)
407 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_ENABLE
,
408 LTTNG_KERNEL_ENABLE
);
411 /* Disable event, channel and session LTTNG_IOCTL_CHECK */
412 int kernctl_disable(int fd
)
414 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_DISABLE
,
415 LTTNG_KERNEL_DISABLE
);
418 int kernctl_start_session(int fd
)
420 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION_START
,
421 LTTNG_KERNEL_SESSION_START
);
424 int kernctl_stop_session(int fd
)
426 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_SESSION_STOP
,
427 LTTNG_KERNEL_SESSION_STOP
);
430 int kernctl_filter(int fd
, struct lttng_filter_bytecode
*filter
)
432 struct lttng_kernel_filter_bytecode
*kb
;
436 /* Translate bytecode to kernel bytecode */
437 kb
= zmalloc(sizeof(*kb
) + filter
->len
);
440 kb
->len
= len
= filter
->len
;
441 kb
->reloc_offset
= filter
->reloc_table_offset
;
442 kb
->seqnum
= filter
->seqnum
;
443 memcpy(kb
->data
, filter
->data
, len
);
444 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_FILTER
, kb
);
449 int kernctl_add_callsite(int fd
, struct lttng_kernel_event_callsite
*callsite
)
451 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_ADD_CALLSITE
, callsite
);
454 int kernctl_tracepoint_list(int fd
)
456 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_TRACEPOINT_LIST
,
457 LTTNG_KERNEL_TRACEPOINT_LIST
);
460 int kernctl_syscall_list(int fd
)
462 return LTTNG_IOCTL_NO_CHECK(fd
, LTTNG_KERNEL_SYSCALL_LIST
);
465 int kernctl_tracer_version(int fd
, struct lttng_kernel_tracer_version
*v
)
469 if (lttng_kernel_use_old_abi
== -1) {
470 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_VERSION
, v
);
472 lttng_kernel_use_old_abi
= 0;
475 lttng_kernel_use_old_abi
= 1;
477 if (lttng_kernel_use_old_abi
) {
478 struct lttng_kernel_old_tracer_version old_v
;
480 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_OLD_TRACER_VERSION
, &old_v
);
484 v
->major
= old_v
.major
;
485 v
->minor
= old_v
.minor
;
486 v
->patchlevel
= old_v
.patchlevel
;
488 ret
= LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_VERSION
, v
);
495 int kernctl_tracer_abi_version(int fd
,
496 struct lttng_kernel_tracer_abi_version
*v
)
498 return LTTNG_IOCTL_CHECK(fd
, LTTNG_KERNEL_TRACER_ABI_VERSION
, v
);
501 int kernctl_wait_quiescent(int fd
)
503 return compat_ioctl_no_arg(fd
, LTTNG_KERNEL_OLD_WAIT_QUIESCENT
,
504 LTTNG_KERNEL_WAIT_QUIESCENT
);
507 int kernctl_buffer_flush(int fd
)
509 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_FLUSH
);
512 int kernctl_buffer_flush_empty(int fd
)
514 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_FLUSH_EMPTY
);
517 int kernctl_buffer_clear(int fd
)
519 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_CLEAR
);
522 /* returns the version of the metadata. */
523 int kernctl_get_metadata_version(int fd
, uint64_t *version
)
525 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_METADATA_VERSION
, version
);
528 int kernctl_metadata_cache_dump(int fd
)
530 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_METADATA_CACHE_DUMP
);
533 /* Buffer operations */
535 /* For mmap mode, readable without "get" operation */
537 /* returns the length to mmap. */
538 int kernctl_get_mmap_len(int fd
, unsigned long *len
)
540 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MMAP_LEN
, len
);
543 /* returns the maximum size for sub-buffers. */
544 int kernctl_get_max_subbuf_size(int fd
, unsigned long *len
)
546 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MAX_SUBBUF_SIZE
, len
);
550 * For mmap mode, operate on the current packet (between get/put or
551 * get_next/put_next).
554 /* returns the offset of the subbuffer belonging to the mmap reader. */
555 int kernctl_get_mmap_read_offset(int fd
, unsigned long *off
)
557 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_MMAP_READ_OFFSET
, off
);
560 /* returns the size of the current sub-buffer, without padding (for mmap). */
561 int kernctl_get_subbuf_size(int fd
, unsigned long *len
)
563 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_SUBBUF_SIZE
, len
);
566 /* returns the size of the current sub-buffer, without padding (for mmap). */
567 int kernctl_get_padded_subbuf_size(int fd
, unsigned long *len
)
569 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_PADDED_SUBBUF_SIZE
, len
);
572 /* Get exclusive read access to the next sub-buffer that can be read. */
573 int kernctl_get_next_subbuf(int fd
)
575 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_NEXT_SUBBUF
);
579 /* Release exclusive sub-buffer access, move consumer forward. */
580 int kernctl_put_next_subbuf(int fd
)
582 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_PUT_NEXT_SUBBUF
);
587 /* Get a snapshot of the current ring buffer producer and consumer positions */
588 int kernctl_snapshot(int fd
)
590 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT
);
594 * Get a snapshot of the current ring buffer producer and consumer positions,
595 * regardless of whether or not the two positions are contained within the
598 int kernctl_snapshot_sample_positions(int fd
)
600 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS
);
603 /* Get the consumer position (iteration start) */
604 int kernctl_snapshot_get_consumed(int fd
, unsigned long *pos
)
606 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_GET_CONSUMED
, pos
);
609 /* Get the producer position (iteration end) */
610 int kernctl_snapshot_get_produced(int fd
, unsigned long *pos
)
612 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_SNAPSHOT_GET_PRODUCED
, pos
);
615 /* Get exclusive read access to the specified sub-buffer position */
616 int kernctl_get_subbuf(int fd
, unsigned long *len
)
618 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_GET_SUBBUF
, len
);
621 /* Release exclusive sub-buffer access */
622 int kernctl_put_subbuf(int fd
)
624 return LTTNG_IOCTL_CHECK(fd
, RING_BUFFER_PUT_SUBBUF
);
627 /* Returns the timestamp begin of the current sub-buffer. */
628 int kernctl_get_timestamp_begin(int fd
, uint64_t *timestamp_begin
)
630 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
,
634 /* Returns the timestamp end of the current sub-buffer. */
635 int kernctl_get_timestamp_end(int fd
, uint64_t *timestamp_end
)
637 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_TIMESTAMP_END
,
641 /* Returns the number of discarded events in the current sub-buffer. */
642 int kernctl_get_events_discarded(int fd
, uint64_t *events_discarded
)
644 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
,
648 /* Returns the content size in the current sub-buffer. */
649 int kernctl_get_content_size(int fd
, uint64_t *content_size
)
651 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_CONTENT_SIZE
,
655 /* Returns the packet size in the current sub-buffer. */
656 int kernctl_get_packet_size(int fd
, uint64_t *packet_size
)
658 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_PACKET_SIZE
,
662 /* Returns the stream id of the current sub-buffer. */
663 int kernctl_get_stream_id(int fd
, uint64_t *stream_id
)
665 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_STREAM_ID
,
669 /* Returns the current timestamp. */
670 int kernctl_get_current_timestamp(int fd
, uint64_t *ts
)
672 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
,
676 /* Returns the packet sequence number of the current sub-buffer. */
677 int kernctl_get_sequence_number(int fd
, uint64_t *seq
)
679 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_GET_SEQ_NUM
, seq
);
682 /* Returns the stream instance id. */
683 int kernctl_get_instance_id(int fd
, uint64_t *id
)
685 return LTTNG_IOCTL_CHECK(fd
, LTTNG_RING_BUFFER_INSTANCE_ID
, id
);