1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* Provide kernel hint to read ahead.
Copyright (C) 2002, 2003, 2004 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <bits/wordsize.h>
#ifdef __UCLIBC_HAS_LFS__
#include <_lfs_64.h>
#ifdef __NR_readahead
# define __NR___readahead __NR_readahead
# if __WORDSIZE == 64
static inline _syscall3(ssize_t, __readahead, int, fd,
off_t, offset, size_t, count);
ssize_t readahead(int fd, off_t offset, size_t count)
{
return __readahead(fd, offset, count);
}
# else
static inline _syscall4(ssize_t, __readahead, int, fd,
off_t, high_offset, off_t, low_offset, size_t, count);
ssize_t readahead(int fd, off64_t offset, size_t count)
{
return __readahead(fd, (off_t) (offset >> 32), (off_t) (offset & 0xffffffff), count);
}
# endif
#endif
#endif /* __UCLIBC_HAS_LFS__ */
|
