1/* Copyright (C) 2007-2025 Free Software Foundation, Inc.
 2   This file is part of the GNU C Library.
 3
 4   The GNU C Library is free software; you can redistribute it and/or
 5   modify it under the terms of the GNU Lesser General Public
 6   License as published by the Free Software Foundation; either
 7   version 2.1 of the License, or (at your option) any later version.
 8
 9   The GNU C Library 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 GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#ifndef	_SYS_EVENTFD_H
19#define	_SYS_EVENTFD_H	1
20
21#include <stdint.h>
22
23/* Get the platform-dependent flags.  */
24#include <bits/eventfd.h>
25
26/* Type for event counter.  */
27typedef uint64_t eventfd_t;
28
29
30__BEGIN_DECLS
31
32/* Return file descriptor for generic event channel.  Set initial
33   value to COUNT.  */
34extern int eventfd (unsigned int __count, int __flags) __THROW;
35
36/* Read event counter and possibly wait for events.  */
37extern int eventfd_read (int __fd, eventfd_t *__value);
38
39/* Increment event counter.  */
40extern int eventfd_write (int __fd, eventfd_t __value);
41
42__END_DECLS
43
44#endif /* sys/eventfd.h */