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
|
/* Minimal - the simplest thing that could possibly work
* Copyright (C) 2007 Jay Freeman (saurik)
*/
/*
* Redistribution and use in source and binary
* forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the
* above copyright notice, this list of conditions
* and the following disclaimer.
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions
* and the following disclaimer in the documentation
* and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse
* or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MINIMAL_MAPPING_H
#define MINIMAL_MAPPING_H
#include <sys/mman.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "minimal/stdlib.h"
void *map(const char *path, size_t offset, size_t size, size_t *psize, bool ro) {
int fd;
_syscall(fd = open(path, ro ? O_RDONLY : O_RDWR));
if (size == _not(size_t)) {
struct stat stat;
_syscall(fstat(fd, &stat));
size = stat.st_size;
}
if (psize != NULL)
*psize = size;
void *base;
_syscall(base = mmap(NULL, size, ro ? PROT_READ : PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset));
_syscall(close(fd));
return base;
}
#endif/*MINIMAL_MAPPING_H*/
|
