glibc/sysdeps/unix/sysv/linux/posix_fallocate.c
2014-02-10 15:07:12 +01:00

60 lines
1.8 KiB
C

/* Copyright (C) 2007-2014 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 <fcntl.h>
#include <kernel-features.h>
#include <sysdep.h>
#define posix_fallocate static internal_fallocate
#include <sysdeps/posix/posix_fallocate.c>
#undef posix_fallocate
#if !defined __ASSUME_FALLOCATE && defined __NR_fallocate
int __have_fallocate attribute_hidden;
#endif
/* Reserve storage for the data of the file associated with FD. */
int
posix_fallocate (int fd, __off_t offset, __off_t len)
{
#ifdef __NR_fallocate
# ifndef __ASSUME_FALLOCATE
if (__glibc_likely (__have_fallocate >= 0))
# endif
{
INTERNAL_SYSCALL_DECL (err);
int res = INTERNAL_SYSCALL (fallocate, err, 6, fd, 0,
__LONG_LONG_PAIR (offset >> 31, offset),
__LONG_LONG_PAIR (len >> 31, len));
if (! INTERNAL_SYSCALL_ERROR_P (res, err))
return 0;
# ifndef __ASSUME_FALLOCATE
if (__glibc_unlikely (INTERNAL_SYSCALL_ERRNO (res, err) == ENOSYS))
__have_fallocate = -1;
else
# endif
if (INTERNAL_SYSCALL_ERRNO (res, err) != EOPNOTSUPP)
return INTERNAL_SYSCALL_ERRNO (res, err);
}
#endif
return internal_fallocate (fd, offset, len);
}