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glibc/sysdeps/unix/sysv/linux/eventfd.c
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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 | |
} |