glibc/sysdeps/unix/sysv/linux/sys/eventfd.h

/* Copyright (C) 2007-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef	_SYS_EVENTFD_H
#define	_SYS_EVENTFD_H	1

#include <stdint.h>

/* Get the platform-dependent flags.  */
#include <bits/eventfd.h>

/* Type for event counter.  */
typedef uint64_t eventfd_t;


__BEGIN_DECLS

/* Return file descriptor for generic event channel.  Set initial
   value to COUNT.  */
extern int eventfd (unsigned int __count, int __flags) __THROW;

/* Read event counter and possibly wait for events.  */
extern int eventfd_read (int __fd, eventfd_t *__value);

/* Increment event counter.  */
extern int eventfd_write (int __fd, eventfd_t __value);

__END_DECLS

#endif /* sys/eventfd.h */