1 /* Provide kernel hint to read ahead.
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <sys/syscall.h>
21 #if defined __NR_readahead && defined __UCLIBC_HAS_LFS__ && defined __USE_GNU
24 # include <bits/wordsize.h>
26 # define __NR___readahead __NR_readahead
30 static __inline__ _syscall3(ssize_t, __readahead, int, fd,
31 off_t, offset, size_t, count)
33 ssize_t readahead(int fd, off_t offset, size_t count)
35 return __readahead(fd, offset, count);
40 static __inline__ _syscall4(ssize_t, __readahead, int, fd,
41 off_t, high_offset, off_t, low_offset, size_t, count)
43 ssize_t readahead(int fd, off64_t offset, size_t count)
45 return __readahead(fd, (off_t) (offset >> 32), (off_t) (offset & 0xffffffff), count);