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/* Copyright (C) 2007-2016 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/>. */
#include <errno.h>
#include <sys/eventfd.h>
#include <sysdep.h>
#include <kernel-features.h>
int
eventfd (unsigned int count, int flags)
{
#ifdef __NR_eventfd2
int res = INLINE_SYSCALL (eventfd2, 2, count, flags);
# ifndef __ASSUME_EVENTFD2
if (res != -1 || errno != ENOSYS)
# endif
return res;
#endif
#ifndef __ASSUME_EVENTFD2
/* The old system call has no flag parameter which is bad. So we have
to wait until we have to support to pass additional values to the
kernel (sys_indirect) before implementing setting flags like
O_NONBLOCK etc. */
if (flags != 0)
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
# ifdef __NR_eventfd
return INLINE_SYSCALL (eventfd, 1, count);
# else
return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOSYS);
# endif
#elif !defined __NR_eventfd2
# error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2"
#endif
}
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