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/* Copyright (C) 2003-2014 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 <errno.h>
#include <fcntl.h>
#include <sysdep.h>
/* Advice the system about the expected behaviour of the application with
respect to the file associated with FD. */
int
posix_fadvise (int fd, off_t offset, off_t len, int advise)
{
#if defined(__NR_fadvise64) || defined(__NR_fadvise64_64)
INTERNAL_SYSCALL_DECL (err);
# ifdef __NR_fadvise64
int ret = INTERNAL_SYSCALL (fadvise64, err, 5, fd,
__LONG_LONG_PAIR (offset >> 31, offset), len,
advise);
# else
int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
__LONG_LONG_PAIR ((long) (offset >> 31),
(long) offset),
__LONG_LONG_PAIR ((long) (len >> 31),
(long) len),
advise);
# endif
if (INTERNAL_SYSCALL_ERROR_P (ret, err))
return INTERNAL_SYSCALL_ERRNO (ret, err);
return 0;
#else
# ifdef __NR_fadvise64_64
INTERNAL_SYSCALL_DECL (err);
int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
__LONG_LONG_PAIR ((long) (offset >> 31),
(long) offset),
__LONG_LONG_PAIR ((long) (len >> 31),
(long) len),
advise);
if (INTERNAL_SYSCALL_ERROR_P (ret, err))
return INTERNAL_SYSCALL_ERRNO (ret, err);
return 0;
# else
return ENOSYS;
# endif
#endif
}
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