[lttng-tools.git] / src / common / kernel-ctl / kernel-ctl.c

/*
 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
 *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *               2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _LGPL_SOURCE
#define __USE_LINUX_IOCTL_DEFS
#include <sys/ioctl.h>
#include <string.h>
#include <common/align.h>
#include <errno.h>
#include <stdarg.h>
#include <assert.h>

#include "kernel-ctl.h"
#include "kernel-ioctl.h"

#define LTTNG_IOCTL_CHECK(fildes, request, ...) ({	\
	int ret = ioctl(fildes, request, ##__VA_ARGS__);\
	assert(ret <= 0);				\
	!ret ? 0 : -errno;				\
})

#define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({	\
	int ret = ioctl(fildes, request, ##__VA_ARGS__);\
	ret >= 0 ? ret : -errno;			\
})

/*
 * This flag indicates which version of the kernel ABI to use. The old
 * ABI (namespace _old) does not support a 32-bit user-space when the
 * kernel is 64-bit. The old ABI is kept here for compatibility but is
 * deprecated and will be removed eventually.
 */
static int lttng_kernel_use_old_abi = -1;

/*
 * Execute the new or old ioctl depending on the ABI version.
 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
 * this function tests if the new ABI is available and otherwise fallbacks
 * on the old one.
 * This function takes the fd on which the ioctl must be executed and the old
 * and new request codes.
 * It returns the return value of the ioctl executed.
 */
static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
		unsigned long newname)
{
	int ret;

	if (lttng_kernel_use_old_abi == -1) {
		ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
		if (!ret) {
			lttng_kernel_use_old_abi = 0;
			goto end;
		}
		lttng_kernel_use_old_abi = 1;
	}
	if (lttng_kernel_use_old_abi) {
		ret = LTTNG_IOCTL_NO_CHECK(fd, oldname);
	} else {
		ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
	}

end:
	return ret;
}

int kernctl_create_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
			LTTNG_KERNEL_SESSION);
}

/* open the metadata global channel */
int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
{
	struct lttng_kernel_channel channel;

	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_channel old_channel;

		memset(&old_channel, 0, sizeof(old_channel));
		old_channel.overwrite = chops->overwrite;
		old_channel.subbuf_size = chops->subbuf_size;
		old_channel.num_subbuf = chops->num_subbuf;
		old_channel.switch_timer_interval = chops->switch_timer_interval;
		old_channel.read_timer_interval = chops->read_timer_interval;
		old_channel.output = chops->output;

		memset(old_channel.padding, 0, sizeof(old_channel.padding));
		/*
		 * The new channel padding is smaller than the old ABI so we use the
		 * new ABI padding size for the memcpy.
		 */
		memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));

		return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_METADATA,
			        &old_channel);
	}

	memset(&channel, 0, sizeof(channel));
	channel.overwrite = chops->overwrite;
	channel.subbuf_size = chops->subbuf_size;
	channel.num_subbuf = chops->num_subbuf;
	channel.switch_timer_interval = chops->switch_timer_interval;
	channel.read_timer_interval = chops->read_timer_interval;
	channel.output = chops->output;
	memcpy(channel.padding, chops->padding, sizeof(chops->padding));

	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_METADATA, &channel);
}

int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
{
	struct lttng_kernel_channel channel;

	memset(&channel, 0, sizeof(channel));
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_channel old_channel;

		old_channel.overwrite = chops->overwrite;
		old_channel.subbuf_size = chops->subbuf_size;
		old_channel.num_subbuf = chops->num_subbuf;
		old_channel.switch_timer_interval = chops->switch_timer_interval;
		old_channel.read_timer_interval = chops->read_timer_interval;
		old_channel.output = chops->output;

		memset(old_channel.padding, 0, sizeof(old_channel.padding));
		/*
		 * The new channel padding is smaller than the old ABI so we use the
		 * new ABI padding size for the memcpy.
		 */
		memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));

		return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_CHANNEL,
			        &old_channel);
	}

	channel.overwrite = chops->overwrite;
	channel.subbuf_size = chops->subbuf_size;
	channel.num_subbuf = chops->num_subbuf;
	channel.switch_timer_interval = chops->switch_timer_interval;
	channel.read_timer_interval = chops->read_timer_interval;
	channel.output = chops->output;
	memcpy(channel.padding, chops->padding, sizeof(chops->padding));

	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel);
}

int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
{
	struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
	size_t array_alloc_len;
	char *new_mask;
	int ret = 0;

	if (!syscall_mask) {
		ret = -1;
		goto end;
	}

	if (!nr_bits) {
		ret = -1;
		goto end;
	}

	kmask_len.len = 0;
	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
	if (ret) {
		goto end;
	}

	array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;

	kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
	if (!kmask) {
		ret = -1;
		goto end;
	}

	kmask->len = kmask_len.len;
	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
	if (ret) {
		goto end;
	}

	new_mask = realloc(*syscall_mask, array_alloc_len);
	if (!new_mask) {
		ret = -1;
		goto end;
	}
	memcpy(new_mask, kmask->mask, array_alloc_len);
	*syscall_mask = new_mask;
	*nr_bits = kmask->len;

end:
	free(kmask);
	return ret;
}

int kernctl_track_pid(int fd, int pid)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid);
}

int kernctl_untrack_pid(int fd, int pid)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid);
}

int kernctl_list_tracker_pids(int fd)
{
	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS);
}

int kernctl_session_regenerate_metadata(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_METADATA_REGEN);
}

int kernctl_session_regenerate_statedump(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_STATEDUMP);
}

int kernctl_create_stream(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
			LTTNG_KERNEL_STREAM);
}

int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
{
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_event old_event;

		memset(&old_event, 0, sizeof(old_event));
		memcpy(old_event.name, ev->name, sizeof(old_event.name));
		old_event.instrumentation = ev->instrumentation;
		switch (ev->instrumentation) {
		case LTTNG_KERNEL_KPROBE:
			old_event.u.kprobe.addr = ev->u.kprobe.addr;
			old_event.u.kprobe.offset = ev->u.kprobe.offset;
			memcpy(old_event.u.kprobe.symbol_name,
				ev->u.kprobe.symbol_name,
				sizeof(old_event.u.kprobe.symbol_name));
			break;
		case LTTNG_KERNEL_KRETPROBE:
			old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
			old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
			memcpy(old_event.u.kretprobe.symbol_name,
				ev->u.kretprobe.symbol_name,
				sizeof(old_event.u.kretprobe.symbol_name));
			break;
		case LTTNG_KERNEL_FUNCTION:
			memcpy(old_event.u.ftrace.symbol_name,
					ev->u.ftrace.symbol_name,
					sizeof(old_event.u.ftrace.symbol_name));
			break;
		default:
			break;
		}

		return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_EVENT,
			        &old_event);
	}
	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_EVENT, ev);
}

int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
{
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_context old_ctx;

		memset(&old_ctx, 0, sizeof(old_ctx));
		old_ctx.ctx = ctx->ctx;
		/* only type that uses the union */
		if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
			old_ctx.u.perf_counter.type =
				ctx->u.perf_counter.type;
			old_ctx.u.perf_counter.config =
				ctx->u.perf_counter.config;
			memcpy(old_ctx.u.perf_counter.name,
				ctx->u.perf_counter.name,
				sizeof(old_ctx.u.perf_counter.name));
		}
		return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
	}
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CONTEXT, ctx);
}


/* Enable event, channel and session LTTNG_IOCTL_CHECK */
int kernctl_enable(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
			LTTNG_KERNEL_ENABLE);
}

/* Disable event, channel and session LTTNG_IOCTL_CHECK */
int kernctl_disable(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
			LTTNG_KERNEL_DISABLE);
}

int kernctl_start_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
			LTTNG_KERNEL_SESSION_START);
}

int kernctl_stop_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
			LTTNG_KERNEL_SESSION_STOP);
}

int kernctl_filter(int fd, struct lttng_filter_bytecode *filter)
{
	struct lttng_kernel_filter_bytecode *kb;
	uint32_t len;
	int ret;

	/* Translate bytecode to kernel bytecode */
	kb = zmalloc(sizeof(*kb) + filter->len);
	if (!kb)
		return -ENOMEM;
	kb->len = len = filter->len;
	kb->reloc_offset = filter->reloc_table_offset;
	kb->seqnum = filter->seqnum;
	memcpy(kb->data, filter->data, len);
	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_FILTER, kb);
	free(kb);
	return ret;
}

int kernctl_add_callsite(int fd, struct lttng_kernel_event_callsite *callsite)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ADD_CALLSITE, callsite);
}

int kernctl_tracepoint_list(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
			LTTNG_KERNEL_TRACEPOINT_LIST);
}

int kernctl_syscall_list(int fd)
{
	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SYSCALL_LIST);
}

int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
{
	int ret;

	if (lttng_kernel_use_old_abi == -1) {
		ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
		if (!ret) {
			lttng_kernel_use_old_abi = 0;
			goto end;
		}
		lttng_kernel_use_old_abi = 1;
	}
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_tracer_version old_v;

		ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
		if (ret) {
			goto end;
		}
		v->major = old_v.major;
		v->minor = old_v.minor;
		v->patchlevel = old_v.patchlevel;
	} else {
		ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
	}

end:
	return ret;
}

int kernctl_tracer_abi_version(int fd,
		struct lttng_kernel_tracer_abi_version *v)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v);
}

int kernctl_wait_quiescent(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
			LTTNG_KERNEL_WAIT_QUIESCENT);
}

int kernctl_buffer_flush(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH);
}

int kernctl_buffer_flush_empty(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH_EMPTY);
}

int kernctl_buffer_clear(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_CLEAR);
}

/* returns the version of the metadata. */
int kernctl_get_metadata_version(int fd, uint64_t *version)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_METADATA_VERSION, version);
}

int kernctl_metadata_cache_dump(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_METADATA_CACHE_DUMP);
}

/* Buffer operations */

/* For mmap mode, readable without "get" operation */

/* returns the length to mmap. */
int kernctl_get_mmap_len(int fd, unsigned long *len)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_LEN, len);
}

/* returns the maximum size for sub-buffers. */
int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
}

/*
 * For mmap mode, operate on the current packet (between get/put or
 * get_next/put_next).
 */

/* returns the offset of the subbuffer belonging to the mmap reader. */
int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
}

/* returns the size of the current sub-buffer, without padding (for mmap). */
int kernctl_get_subbuf_size(int fd, unsigned long *len)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
}

/* returns the size of the current sub-buffer, without padding (for mmap). */
int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
}

/* Get exclusive read access to the next sub-buffer that can be read. */
int kernctl_get_next_subbuf(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_NEXT_SUBBUF);
}


/* Release exclusive sub-buffer access, move consumer forward. */
int kernctl_put_next_subbuf(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
}

/* snapshot */

/* Get a snapshot of the current ring buffer producer and consumer positions */
int kernctl_snapshot(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT);
}

/*
 * Get a snapshot of the current ring buffer producer and consumer positions,
 * regardless of whether or not the two positions are contained within the
 * same sub-buffer.
 */
int kernctl_snapshot_sample_positions(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS);
}

/* Get the consumer position (iteration start) */
int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
}

/* Get the producer position (iteration end) */
int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
}

/* Get exclusive read access to the specified sub-buffer position */
int kernctl_get_subbuf(int fd, unsigned long *len)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF, len);
}

/* Release exclusive sub-buffer access */
int kernctl_put_subbuf(int fd)
{
	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_SUBBUF);
}

/* Returns the timestamp begin of the current sub-buffer. */
int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN,
			timestamp_begin);
}

/* Returns the timestamp end of the current sub-buffer. */
int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END,
			timestamp_end);
}

/* Returns the number of discarded events in the current sub-buffer. */
int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED,
			events_discarded);
}

/* Returns the content size in the current sub-buffer. */
int kernctl_get_content_size(int fd, uint64_t *content_size)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE,
			content_size);
}

/* Returns the packet size in the current sub-buffer. */
int kernctl_get_packet_size(int fd, uint64_t *packet_size)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE,
		        packet_size);
}

/* Returns the stream id of the current sub-buffer. */
int kernctl_get_stream_id(int fd, uint64_t *stream_id)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_STREAM_ID,
		        stream_id);
}

/* Returns the current timestamp. */
int kernctl_get_current_timestamp(int fd, uint64_t *ts)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP,
			ts);
}

/* Returns the packet sequence number of the current sub-buffer. */
int kernctl_get_sequence_number(int fd, uint64_t *seq)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_SEQ_NUM, seq);
}

/* Returns the stream instance id. */
int kernctl_get_instance_id(int fd, uint64_t *id)
{
	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_INSTANCE_ID, id);
}
Commit	Line	Data
ee0326c0	1	/*
16421f6e DG	2	* Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
16421f6e DG	3	* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
a6bd6d9b	4	* 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
ee0326c0	5	*
d14d33bf AM	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.
ee0326c0 DG	9	*
	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.
	14	*
d14d33bf AM	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.
ee0326c0	18	*/
16421f6e	19
6c1c0768	20	#define _LGPL_SOURCE
95ba0f2f	21	#define __USE_LINUX_IOCTL_DEFS
16421f6e	22	#include <sys/ioctl.h>
4dbc372b	23	#include <string.h>
46820c8b	24	#include <common/align.h>
00a62084	25	#include <errno.h>
a6bd6d9b JG	26	#include <stdarg.h>
a6bd6d9b JG	27	#include <assert.h>
16421f6e	28
10a8a223	29	#include "kernel-ctl.h"
16421f6e	30	#include "kernel-ioctl.h"
16421f6e	31
5226f1bc	32	#define LTTNG_IOCTL_CHECK(fildes, request, ...) ({ \
a6bd6d9b JG	33	int ret = ioctl(fildes, request, ##__VA_ARGS__);\
a6bd6d9b JG	34	assert(ret <= 0); \
5226f1bc JG	35	!ret ? 0 : -errno; \
	36	})
	37
	38	#define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({ \
	39	int ret = ioctl(fildes, request, ##__VA_ARGS__);\
	40	ret >= 0 ? ret : -errno; \
a6bd6d9b JG	41	})
a6bd6d9b JG	42
4dbc372b JD	43	/*
	44	* This flag indicates which version of the kernel ABI to use. The old
	45	* ABI (namespace _old) does not support a 32-bit user-space when the
	46	* kernel is 64-bit. The old ABI is kept here for compatibility but is
	47	* deprecated and will be removed eventually.
	48	*/
	49	static int lttng_kernel_use_old_abi = -1;
	50
	51	/*
	52	* Execute the new or old ioctl depending on the ABI version.
	53	* If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
	54	* this function tests if the new ABI is available and otherwise fallbacks
	55	* on the old one.
	56	* This function takes the fd on which the ioctl must be executed and the old
	57	* and new request codes.
	58	* It returns the return value of the ioctl executed.
	59	*/
	60	static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
	61	unsigned long newname)
	62	{
	63	int ret;
	64
	65	if (lttng_kernel_use_old_abi == -1) {
5226f1bc	66	ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
4dbc372b JD	67	if (!ret) {
	68	lttng_kernel_use_old_abi = 0;
	69	goto end;
	70	}
	71	lttng_kernel_use_old_abi = 1;
	72	}
	73	if (lttng_kernel_use_old_abi) {
5226f1bc	74	ret = LTTNG_IOCTL_NO_CHECK(fd, oldname);
4dbc372b	75	} else {
5226f1bc	76	ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
4dbc372b JD	77	}
	78
	79	end:
	80	return ret;
	81	}
	82
964ccb60	83	int kernctl_create_session(int fd)
d65106b1	84	{
4dbc372b JD	85	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
4dbc372b JD	86	LTTNG_KERNEL_SESSION);
d65106b1 DG	87	}
d65106b1 DG	88
964ccb60 MD	89	/* open the metadata global channel */
964ccb60 MD	90	int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
f3ed775e	91	{
4dbc372b JD	92	struct lttng_kernel_channel channel;
	93
	94	if (lttng_kernel_use_old_abi) {
10600be0 MD	95	struct lttng_kernel_old_channel old_channel;
	96
	97	memset(&old_channel, 0, sizeof(old_channel));
4dbc372b JD	98	old_channel.overwrite = chops->overwrite;
	99	old_channel.subbuf_size = chops->subbuf_size;
	100	old_channel.num_subbuf = chops->num_subbuf;
	101	old_channel.switch_timer_interval = chops->switch_timer_interval;
	102	old_channel.read_timer_interval = chops->read_timer_interval;
	103	old_channel.output = chops->output;
f853c53a DG	104
	105	memset(old_channel.padding, 0, sizeof(old_channel.padding));
	106	/*
	107	* The new channel padding is smaller than the old ABI so we use the
	108	* new ABI padding size for the memcpy.
	109	*/
	110	memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
4dbc372b	111
5226f1bc JG	112	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_METADATA,
5226f1bc JG	113	&old_channel);
4dbc372b JD	114	}
4dbc372b JD	115
10600be0	116	memset(&channel, 0, sizeof(channel));
4dbc372b JD	117	channel.overwrite = chops->overwrite;
	118	channel.subbuf_size = chops->subbuf_size;
	119	channel.num_subbuf = chops->num_subbuf;
	120	channel.switch_timer_interval = chops->switch_timer_interval;
	121	channel.read_timer_interval = chops->read_timer_interval;
	122	channel.output = chops->output;
ea207e3b	123	memcpy(channel.padding, chops->padding, sizeof(chops->padding));
4dbc372b	124
5226f1bc	125	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_METADATA, &channel);
f3ed775e DG	126	}
	127
	128	int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
16421f6e	129	{
4dbc372b JD	130	struct lttng_kernel_channel channel;
4dbc372b JD	131
c74101ef	132	memset(&channel, 0, sizeof(channel));
4dbc372b JD	133	if (lttng_kernel_use_old_abi) {
	134	struct lttng_kernel_old_channel old_channel;
	135
	136	old_channel.overwrite = chops->overwrite;
	137	old_channel.subbuf_size = chops->subbuf_size;
	138	old_channel.num_subbuf = chops->num_subbuf;
	139	old_channel.switch_timer_interval = chops->switch_timer_interval;
	140	old_channel.read_timer_interval = chops->read_timer_interval;
	141	old_channel.output = chops->output;
f853c53a DG	142
	143	memset(old_channel.padding, 0, sizeof(old_channel.padding));
	144	/*
	145	* The new channel padding is smaller than the old ABI so we use the
	146	* new ABI padding size for the memcpy.
	147	*/
	148	memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
4dbc372b	149
5226f1bc JG	150	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_CHANNEL,
5226f1bc JG	151	&old_channel);
4dbc372b JD	152	}
	153
	154	channel.overwrite = chops->overwrite;
	155	channel.subbuf_size = chops->subbuf_size;
	156	channel.num_subbuf = chops->num_subbuf;
	157	channel.switch_timer_interval = chops->switch_timer_interval;
	158	channel.read_timer_interval = chops->read_timer_interval;
	159	channel.output = chops->output;
ea207e3b	160	memcpy(channel.padding, chops->padding, sizeof(chops->padding));
4dbc372b	161
5226f1bc	162	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel);
16421f6e DG	163	}
16421f6e DG	164
46820c8b MD	165	int kernctl_syscall_mask(int fd, char *syscall_mask, uint32_t nr_bits)
	166	{
	167	struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
	168	size_t array_alloc_len;
	169	char *new_mask;
	170	int ret = 0;
	171
	172	if (!syscall_mask) {
	173	ret = -1;
	174	goto end;
	175	}
	176
	177	if (!nr_bits) {
	178	ret = -1;
	179	goto end;
	180	}
	181
	182	kmask_len.len = 0;
5226f1bc	183	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
46820c8b MD	184	if (ret) {
	185	goto end;
	186	}
	187
	188	array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
834978fd	189
46820c8b MD	190	kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
	191	if (!kmask) {
	192	ret = -1;
	193	goto end;
	194	}
	195
	196	kmask->len = kmask_len.len;
5226f1bc	197	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
46820c8b MD	198	if (ret) {
	199	goto end;
	200	}
	201
834978fd	202	new_mask = realloc(*syscall_mask, array_alloc_len);
46820c8b MD	203	if (!new_mask) {
	204	ret = -1;
	205	goto end;
	206	}
	207	memcpy(new_mask, kmask->mask, array_alloc_len);
	208	*syscall_mask = new_mask;
	209	*nr_bits = kmask->len;
	210
	211	end:
	212	free(kmask);
	213	return ret;
	214	}
	215
ccf10263 MD	216	int kernctl_track_pid(int fd, int pid)
ccf10263 MD	217	{
5226f1bc	218	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid);
ccf10263 MD	219	}
	220
	221	int kernctl_untrack_pid(int fd, int pid)
	222	{
5226f1bc	223	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid);
ccf10263 MD	224	}
ccf10263 MD	225
a5dfbb9d MD	226	int kernctl_list_tracker_pids(int fd)
a5dfbb9d MD	227	{
5226f1bc	228	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS);
a5dfbb9d MD	229	}
a5dfbb9d MD	230
eded6438	231	int kernctl_session_regenerate_metadata(int fd)
93ec662e	232	{
5226f1bc	233	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_METADATA_REGEN);
93ec662e JD	234	}
93ec662e JD	235
c2561365 JD	236	int kernctl_session_regenerate_statedump(int fd)
	237	{
	238	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_STATEDUMP);
	239	}
	240
964ccb60	241	int kernctl_create_stream(int fd)
16421f6e	242	{
4dbc372b JD	243	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
4dbc372b JD	244	LTTNG_KERNEL_STREAM);
16421f6e DG	245	}
16421f6e DG	246
964ccb60	247	int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
16421f6e	248	{
4dbc372b JD	249	if (lttng_kernel_use_old_abi) {
	250	struct lttng_kernel_old_event old_event;
	251
10600be0	252	memset(&old_event, 0, sizeof(old_event));
4dbc372b JD	253	memcpy(old_event.name, ev->name, sizeof(old_event.name));
	254	old_event.instrumentation = ev->instrumentation;
	255	switch (ev->instrumentation) {
	256	case LTTNG_KERNEL_KPROBE:
	257	old_event.u.kprobe.addr = ev->u.kprobe.addr;
	258	old_event.u.kprobe.offset = ev->u.kprobe.offset;
	259	memcpy(old_event.u.kprobe.symbol_name,
	260	ev->u.kprobe.symbol_name,
	261	sizeof(old_event.u.kprobe.symbol_name));
	262	break;
	263	case LTTNG_KERNEL_KRETPROBE:
	264	old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
	265	old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
	266	memcpy(old_event.u.kretprobe.symbol_name,
	267	ev->u.kretprobe.symbol_name,
	268	sizeof(old_event.u.kretprobe.symbol_name));
	269	break;
	270	case LTTNG_KERNEL_FUNCTION:
	271	memcpy(old_event.u.ftrace.symbol_name,
	272	ev->u.ftrace.symbol_name,
	273	sizeof(old_event.u.ftrace.symbol_name));
	274	break;
	275	default:
	276	break;
	277	}
	278
5226f1bc JG	279	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_EVENT,
5226f1bc JG	280	&old_event);
4dbc372b	281	}
5226f1bc	282	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_EVENT, ev);
16421f6e DG	283	}
16421f6e DG	284
964ccb60	285	int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
16421f6e	286	{
4dbc372b JD	287	if (lttng_kernel_use_old_abi) {
	288	struct lttng_kernel_old_context old_ctx;
	289
10600be0	290	memset(&old_ctx, 0, sizeof(old_ctx));
4dbc372b JD	291	old_ctx.ctx = ctx->ctx;
4dbc372b JD	292	/* only type that uses the union */
aa3514e9	293	if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
4dbc372b JD	294	old_ctx.u.perf_counter.type =
	295	ctx->u.perf_counter.type;
	296	old_ctx.u.perf_counter.config =
	297	ctx->u.perf_counter.config;
	298	memcpy(old_ctx.u.perf_counter.name,
	299	ctx->u.perf_counter.name,
	300	sizeof(old_ctx.u.perf_counter.name));
	301	}
5226f1bc	302	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
4dbc372b	303	}
5226f1bc	304	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CONTEXT, ctx);
16421f6e DG	305	}
16421f6e DG	306
964ccb60	307
5226f1bc	308	/* Enable event, channel and session LTTNG_IOCTL_CHECK */
f3ed775e DG	309	int kernctl_enable(int fd)
f3ed775e DG	310	{
4dbc372b JD	311	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
4dbc372b JD	312	LTTNG_KERNEL_ENABLE);
f3ed775e DG	313	}
f3ed775e DG	314
5226f1bc	315	/* Disable event, channel and session LTTNG_IOCTL_CHECK */
f3ed775e DG	316	int kernctl_disable(int fd)
f3ed775e DG	317	{
4dbc372b JD	318	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
4dbc372b JD	319	LTTNG_KERNEL_DISABLE);
f3ed775e DG	320	}
f3ed775e DG	321
964ccb60	322	int kernctl_start_session(int fd)
16421f6e	323	{
4dbc372b JD	324	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
4dbc372b JD	325	LTTNG_KERNEL_SESSION_START);
964ccb60 MD	326	}
	327
	328	int kernctl_stop_session(int fd)
	329	{
4dbc372b JD	330	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
4dbc372b JD	331	LTTNG_KERNEL_SESSION_STOP);
16421f6e DG	332	}
16421f6e DG	333
00a62084 MD	334	int kernctl_filter(int fd, struct lttng_filter_bytecode *filter)
	335	{
	336	struct lttng_kernel_filter_bytecode *kb;
	337	uint32_t len;
	338	int ret;
	339
	340	/* Translate bytecode to kernel bytecode */
	341	kb = zmalloc(sizeof(*kb) + filter->len);
	342	if (!kb)
	343	return -ENOMEM;
	344	kb->len = len = filter->len;
	345	kb->reloc_offset = filter->reloc_table_offset;
	346	kb->seqnum = filter->seqnum;
	347	memcpy(kb->data, filter->data, len);
5226f1bc	348	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_FILTER, kb);
00a62084 MD	349	free(kb);
	350	return ret;
	351	}
	352
1ab8c2ad FD	353	int kernctl_add_callsite(int fd, struct lttng_kernel_event_callsite *callsite)
	354	{
	355	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ADD_CALLSITE, callsite);
	356	}
	357
964ccb60 MD	358	int kernctl_tracepoint_list(int fd)
964ccb60 MD	359	{
4dbc372b JD	360	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
4dbc372b JD	361	LTTNG_KERNEL_TRACEPOINT_LIST);
964ccb60 MD	362	}
964ccb60 MD	363
d02666a9 MD	364	int kernctl_syscall_list(int fd)
d02666a9 MD	365	{
5226f1bc	366	return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SYSCALL_LIST);
d02666a9 MD	367	}
d02666a9 MD	368
964ccb60 MD	369	int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
964ccb60 MD	370	{
4dbc372b JD	371	int ret;
	372
	373	if (lttng_kernel_use_old_abi == -1) {
5226f1bc	374	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
4dbc372b JD	375	if (!ret) {
	376	lttng_kernel_use_old_abi = 0;
	377	goto end;
	378	}
	379	lttng_kernel_use_old_abi = 1;
	380	}
	381	if (lttng_kernel_use_old_abi) {
	382	struct lttng_kernel_old_tracer_version old_v;
	383
5226f1bc	384	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
4dbc372b JD	385	if (ret) {
	386	goto end;
	387	}
	388	v->major = old_v.major;
	389	v->minor = old_v.minor;
	390	v->patchlevel = old_v.patchlevel;
	391	} else {
5226f1bc	392	ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
4dbc372b JD	393	}
	394
	395	end:
	396	return ret;
964ccb60 MD	397	}
964ccb60 MD	398
c052142c MD	399	int kernctl_tracer_abi_version(int fd,
	400	struct lttng_kernel_tracer_abi_version *v)
	401	{
5226f1bc	402	return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v);
c052142c MD	403	}
c052142c MD	404
964ccb60 MD	405	int kernctl_wait_quiescent(int fd)
964ccb60 MD	406	{
4dbc372b JD	407	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
4dbc372b JD	408	LTTNG_KERNEL_WAIT_QUIESCENT);
964ccb60 MD	409	}
964ccb60 MD	410
964ccb60 MD	411	int kernctl_buffer_flush(int fd)
964ccb60 MD	412	{
5226f1bc	413	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH);
964ccb60 MD	414	}
964ccb60 MD	415
f22dd891 MD	416	int kernctl_buffer_flush_empty(int fd)
	417	{
	418	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH_EMPTY);
	419	}
	420
193978ff JR	421	int kernctl_buffer_clear(int fd)
	422	{
	423	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_CLEAR);
	424	}
	425
93ec662e JD	426	/* returns the version of the metadata. */
	427	int kernctl_get_metadata_version(int fd, uint64_t *version)
	428	{
5226f1bc	429	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_METADATA_VERSION, version);
93ec662e JD	430	}
93ec662e JD	431
8024cc8c JD	432	int kernctl_metadata_cache_dump(int fd)
	433	{
	434	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_METADATA_CACHE_DUMP);
	435	}
964ccb60 MD	436
	437	/* Buffer operations */
	438
	439	/* For mmap mode, readable without "get" operation */
	440
16421f6e DG	441	/* returns the length to mmap. */
	442	int kernctl_get_mmap_len(int fd, unsigned long *len)
	443	{
5226f1bc	444	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_LEN, len);
16421f6e DG	445	}
16421f6e DG	446
964ccb60 MD	447	/* returns the maximum size for sub-buffers. */
	448	int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
	449	{
5226f1bc	450	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
964ccb60 MD	451	}
	452
	453	/*
	454	* For mmap mode, operate on the current packet (between get/put or
	455	* get_next/put_next).
	456	*/
	457
16421f6e DG	458	/* returns the offset of the subbuffer belonging to the mmap reader. */
	459	int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
	460	{
5226f1bc	461	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
16421f6e DG	462	}
16421f6e DG	463
964ccb60 MD	464	/* returns the size of the current sub-buffer, without padding (for mmap). */
964ccb60 MD	465	int kernctl_get_subbuf_size(int fd, unsigned long *len)
16421f6e	466	{
5226f1bc	467	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
16421f6e DG	468	}
	469
	470	/* returns the size of the current sub-buffer, without padding (for mmap). */
	471	int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
	472	{
5226f1bc	473	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
16421f6e DG	474	}
16421f6e DG	475
964ccb60 MD	476	/* Get exclusive read access to the next sub-buffer that can be read. */
964ccb60 MD	477	int kernctl_get_next_subbuf(int fd)
16421f6e	478	{
5226f1bc	479	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_NEXT_SUBBUF);
16421f6e DG	480	}
16421f6e DG	481
d4a1283e	482
16421f6e DG	483	/* Release exclusive sub-buffer access, move consumer forward. */
	484	int kernctl_put_next_subbuf(int fd)
	485	{
5226f1bc	486	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
16421f6e DG	487	}
16421f6e DG	488
964ccb60	489	/* snapshot */
16421f6e DG	490
	491	/* Get a snapshot of the current ring buffer producer and consumer positions */
	492	int kernctl_snapshot(int fd)
	493	{
5226f1bc	494	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT);
16421f6e DG	495	}
16421f6e DG	496
b007ec59 JG	497	/*
	498	* Get a snapshot of the current ring buffer producer and consumer positions,
	499	* regardless of whether or not the two positions are contained within the
	500	* same sub-buffer.
	501	*/
	502	int kernctl_snapshot_sample_positions(int fd)
	503	{
	504	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS);
	505	}
	506
16421f6e DG	507	/* Get the consumer position (iteration start) */
	508	int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
	509	{
5226f1bc	510	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
16421f6e DG	511	}
	512
	513	/* Get the producer position (iteration end) */
	514	int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
	515	{
5226f1bc	516	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
16421f6e DG	517	}
16421f6e DG	518
964ccb60 MD	519	/* Get exclusive read access to the specified sub-buffer position */
964ccb60 MD	520	int kernctl_get_subbuf(int fd, unsigned long *len)
f3ed775e	521	{
5226f1bc	522	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF, len);
f3ed775e	523	}
d0254c7c	524
964ccb60 MD	525	/* Release exclusive sub-buffer access */
964ccb60 MD	526	int kernctl_put_subbuf(int fd)
d0254c7c	527	{
5226f1bc	528	return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_SUBBUF);
d0254c7c	529	}
309167d2 JD	530
	531	/* Returns the timestamp begin of the current sub-buffer. */
	532	int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
	533	{
5226f1bc	534	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN,
a6bd6d9b	535	timestamp_begin);
309167d2 JD	536	}
	537
	538	/* Returns the timestamp end of the current sub-buffer. */
	539	int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
	540	{
5226f1bc	541	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END,
a6bd6d9b	542	timestamp_end);
309167d2 JD	543	}
	544
	545	/* Returns the number of discarded events in the current sub-buffer. */
	546	int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
	547	{
5226f1bc	548	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED,
a6bd6d9b	549	events_discarded);
309167d2 JD	550	}
	551
	552	/* Returns the content size in the current sub-buffer. */
	553	int kernctl_get_content_size(int fd, uint64_t *content_size)
	554	{
5226f1bc	555	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE,
a6bd6d9b	556	content_size);
309167d2 JD	557	}
	558
	559	/* Returns the packet size in the current sub-buffer. */
	560	int kernctl_get_packet_size(int fd, uint64_t *packet_size)
	561	{
5226f1bc JG	562	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE,
5226f1bc JG	563	packet_size);
309167d2 JD	564	}
	565
	566	/* Returns the stream id of the current sub-buffer. */
	567	int kernctl_get_stream_id(int fd, uint64_t *stream_id)
	568	{
5226f1bc JG	569	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_STREAM_ID,
5226f1bc JG	570	stream_id);
309167d2	571	}
d3e2ba59 JD	572
	573	/* Returns the current timestamp. */
	574	int kernctl_get_current_timestamp(int fd, uint64_t *ts)
	575	{
5226f1bc JG	576	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP,
5226f1bc JG	577	ts);
d3e2ba59	578	}
fb83fe64 JD	579
	580	/* Returns the packet sequence number of the current sub-buffer. */
	581	int kernctl_get_sequence_number(int fd, uint64_t *seq)
	582	{
5226f1bc	583	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_SEQ_NUM, seq);
fb83fe64	584	}
000fa86f JD	585
	586	/* Returns the stream instance id. */
	587	int kernctl_get_instance_id(int fd, uint64_t *id)
	588	{
5226f1bc	589	return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_INSTANCE_ID, id);
000fa86f	590	}