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
|
/* Copyright (C) 2009, 2012 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 <stddef.h>
#include <sys/param.h>
#if __WORDSIZE == 64
/* Hide the preadv64 declaration. */
# define preadv64 __redirect_preadv64
#endif
#include <sys/uio.h>
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#include <kernel-features.h>
#ifndef PREADV
# define PREADV preadv
# define PREADV_REPLACEMENT __atomic_preadv_replacement
# define PREAD __pread
# define OFF_T off_t
#endif
#define LO_HI_LONG(val) \
(off_t) val, \
(off_t) ((((uint64_t) (val)) >> (sizeof (long) * 4)) >> (sizeof (long) * 4))
#ifndef __ASSUME_PREADV
static ssize_t PREADV_REPLACEMENT (int, const struct iovec *,
int, OFF_T) internal_function;
#endif
ssize_t
PREADV (fd, vector, count, offset)
int fd;
const struct iovec *vector;
int count;
OFF_T offset;
{
#ifdef __NR_preadv
ssize_t result;
if (SINGLE_THREAD_P)
result = INLINE_SYSCALL (preadv, 5, fd, vector, count,
LO_HI_LONG (offset));
else
{
int oldtype = LIBC_CANCEL_ASYNC ();
result = INLINE_SYSCALL (preadv, 5, fd, vector, count,
LO_HI_LONG (offset));
LIBC_CANCEL_RESET (oldtype);
}
# ifdef __ASSUME_PREADV
return result;
# endif
#endif
#ifndef __ASSUME_PREADV
# ifdef __NR_preadv
if (result >= 0 || errno != ENOSYS)
return result;
# endif
return PREADV_REPLACEMENT (fd, vector, count, offset);
#endif
}
#if __WORDSIZE == 64
# undef preadv64
strong_alias (preadv, preadv64)
#endif
#ifndef __ASSUME_PREADV
# undef PREADV
# define PREADV static internal_function PREADV_REPLACEMENT
# include <sysdeps/posix/preadv.c>
#endif
|
