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
|
/* Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <unistd.h>
#include <endian.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include <kernel-features.h>
#if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
# if __ASSUME_PREAD_SYSCALL == 0
static ssize_t __emulate_pread (int fd, void *buf, size_t count,
off_t offset) internal_function;
# endif
extern ssize_t __syscall_pread (int fd, void *__unbounded buf, size_t count,
int dummy, off_t offset_hi, off_t offset_lo);
ssize_t
__libc_pread (fd, buf, count, offset)
int fd;
void *buf;
size_t count;
off_t offset;
{
ssize_t result;
/* First try the syscall. */
result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, 0,
__LONG_LONG_PAIR (0, offset));
# if __ASSUME_PREAD_SYSCALL == 0
if (result == -1 && errno == ENOSYS)
/* No system call available. Use the emulation. */
result = __emulate_pread (fd, buf, count, offset);
# endif
return result;
}
strong_alias (__libc_pread, __pread)
weak_alias (__libc_pread, pread)
# define __libc_pread(fd, buf, count, offset) \
static internal_function __emulate_pread (fd, buf, count, offset)
#endif
#if __ASSUME_PREAD_SYSCALL == 0
# include <sysdeps/posix/pread.c>
#endif
|
