1/*	$NetBSD: eventfd.h,v 1.3 2021/09/21 13:51:46 ryoon Exp $	*/
 2
 3/*-
 4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
 5 * All rights reserved.
 6 *
 7 * This code is derived from software contributed to The NetBSD Foundation
 8 * by Jason R. Thorpe.
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _SYS_EVENTFD_H_
33#define	_SYS_EVENTFD_H_
34
35#include <sys/fcntl.h>
36
37/*
38 * Definitions for eventfd(2).  This implementation is API compatible
39 * with the Linux eventfd(2) interface.
40 */
41
42typedef uint64_t eventfd_t;
43
44#define	EFD_SEMAPHORE	O_RDWR
45#define	EFD_CLOEXEC	O_CLOEXEC
46#define	EFD_NONBLOCK	O_NONBLOCK
47
48#ifdef _KERNEL
49struct lwp;
50int	do_eventfd(struct lwp *, unsigned int, int, register_t *);
51#else /* ! _KERNEL */
52__BEGIN_DECLS
53int	eventfd(unsigned int, int);
54int	eventfd_read(int, eventfd_t *);
55int	eventfd_write(int, eventfd_t);
56__END_DECLS
57#endif /* _KERNEL */
58
59#endif /* _SYS_EVENTFD_H_ */