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
|
/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
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 <unistd.h>
#include <sys/mman.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include "kernel-features.h"
/* This is always the constant 12 for this routine, even if the actual
page size is larger. */
#define PAGE_SHIFT 12
#ifdef __NR_mmap2
extern void *__unbounded __syscall_mmap2(void *__unbounded, size_t,
int, int, int, off_t);
#ifndef __ASSUME_MMAP2_SYSCALL
static int have_no_mmap2;
#endif
#endif
void *
__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
{
if (offset & ((1 << PAGE_SHIFT)-1))
{
__set_errno (EINVAL);
return MAP_FAILED;
}
#ifdef __NR_mmap2
# ifndef __ASSUME_MMAP2_SYSCALL
if (! have_no_mmap2)
# endif
{
# ifndef __ASSUME_MMAP2_SYSCALL
int saved_errno = errno;
# endif
void *result;
__ptrvalue (result) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len,
prot, flags, fd,
(off_t) (offset >> PAGE_SHIFT));
# if __BOUNDED_POINTERS__
__ptrlow (result) = __ptrvalue (result);
__ptrhigh (result) = __ptrvalue (result) + len;
# endif
# ifndef __ASSUME_MMAP2_SYSCALL
if (result != MAP_FAILED || errno != ENOSYS)
# endif
return result;
# ifndef __ASSUME_MMAP2_SYSCALL
__set_errno (saved_errno);
have_no_mmap2 = 1;
# endif
}
#endif
#ifndef __ASSUME_MMAP2_SYSCALL
if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
{
__set_errno (EINVAL);
return MAP_FAILED;
}
return __mmap (addr, len, prot, flags, fd, (off_t) offset);
#endif
}
weak_alias (__mmap64, mmap64)
|
