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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/*
* Based in part on the files
* ./sysdeps/unix/sysv/linux/pwrite.c,
* ./sysdeps/unix/sysv/linux/pread.c,
* sysdeps/posix/pread.c
* sysdeps/posix/pwrite.c
* from GNU libc 2.2.5, but reworked considerably...
*/
#include <sys/syscall.h>
#include <unistd.h>
#include <endian.h>
#include <bits/wordsize.h>
#include <cancel.h>
#ifdef __NR_pread64
# undef __NR_pread
# define __NR_pread __NR_pread64
#endif
#ifdef __NR_pwrite64
# undef __NR_pwrite
# define __NR_pwrite __NR_pwrite64
#endif
#ifndef MY_PREAD
# ifdef __NR_pread
# define __NR___syscall_pread __NR_pread
# if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
static _syscall6(ssize_t, __syscall_pread, int, fd, void *, buf,
size_t, count, int, dummy, off_t, offset_hi, off_t, offset_lo)
# define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, 0, OFF_HI_LO(offset))
# define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, 0, OFF64_HI_LO(offset))
# elif __WORDSIZE == 32
static _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
size_t, count, off_t, offset_hi, off_t, offset_lo)
# define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, OFF_HI_LO(offset))
# define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, OFF64_HI_LO(offset))
# else
static _syscall4(ssize_t, __syscall_pread, int, fd, void *, buf,
size_t, count, off_t, offset)
# define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, offset)
# define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, offset)
# endif
# endif
#endif
#ifndef MY_PWRITE
# ifdef __NR_pwrite
# define __NR___syscall_pwrite __NR_pwrite
# if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
static _syscall6(ssize_t, __syscall_pwrite, int, fd, const void *, buf,
size_t, count, int, dummy, off_t, offset_hi, off_t, offset_lo)
# define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, 0, OFF_HI_LO(offset))
# define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, 0, OFF64_HI_LO(offset))
# elif __WORDSIZE == 32
static _syscall5(ssize_t, __syscall_pwrite, int, fd, const void *, buf,
size_t, count, off_t, offset_hi, off_t, offset_lo)
# define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, OFF_HI_LO(offset))
# define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, OFF64_HI_LO(offset))
# else
static _syscall4(ssize_t, __syscall_pwrite, int, fd, const void *, buf,
size_t, count, off_t, offset)
# define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, offset)
# define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, offset)
# endif
# endif
#endif
static ssize_t __NC(pread)(int fd, void *buf, size_t count, off_t offset)
{
return MY_PREAD(fd, buf, count, offset);
}
CANCELLABLE_SYSCALL(ssize_t, pread, (int fd, void *buf, size_t count, off_t offset),
(fd, buf, count, offset))
static ssize_t __NC(pwrite)(int fd, const void *buf, size_t count, off_t offset)
{
return MY_PWRITE(fd, buf, count, offset);
}
CANCELLABLE_SYSCALL(ssize_t, pwrite, (int fd, const void *buf, size_t count, off_t offset),
(fd, buf, count, offset))
#if __WORDSIZE == 32
static ssize_t __NC(pread64)(int fd, void *buf, size_t count, off64_t offset)
{
return MY_PREAD64(fd, buf, count, offset);
}
CANCELLABLE_SYSCALL(ssize_t, pread64, (int fd, void *buf, size_t count, off64_t offset),
(fd, buf, count, offset))
static ssize_t __NC(pwrite64)(int fd, const void *buf, size_t count, off64_t offset)
{
return MY_PWRITE64(fd, buf, count, offset);
}
CANCELLABLE_SYSCALL(ssize_t, pwrite64, (int fd, const void *buf, size_t count, off64_t offset),
(fd, buf, count, offset))
#else
# ifdef __UCLIBC_HAS_LINUXTHREADS__
weak_alias(pread,pread64)
weak_alias(pwrite,pwrite64)
lt_strong_alias(pread64)
lt_strong_alias(pwrite64)
# else
strong_alias_untyped(pread,pread64)
strong_alias_untyped(pwrite,pwrite64)
# endif
#endif
|
