blob: b6ee6501501e763ed443e303794f72b42c5ba6a8 (
plain)
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
|
#include <limits.h>
#ifdef __unix__ /* ??? Is that good enough? */
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
#else
#define MAP_ANON MAP_FILE
#endif
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifndef MAP_FIXED
#define MAP_FIXED 0
#endif
#endif
#define MAP_START (void *)0x7fff8000
#define MAP_LEN 0x10000
#define OFFSET (MAP_LEN/2 - 2 * sizeof (int));
f (int *p, int **q)
{
int i;
for (i = 0; i < 40; i++)
{
*q++ = &p[i];
}
}
main ()
{
#ifdef MAP_ANON
void *p;
int *q[40];
int dev_zero;
dev_zero = open ("/dev/zero", O_RDONLY);
/* -1 is OK when we have MAP_ANON; else mmap will flag an error. */
if (INT_MAX != 0x7fffffffL || sizeof (char *) != sizeof (int))
exit (0);
p = mmap (MAP_START, MAP_LEN, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_FIXED|MAP_PRIVATE, dev_zero, 0);
if (p != (void *)-1)
{
p = (char *)p + OFFSET;
q[39] = 0;
f (p, q);
if (q[39] != (int *)p + 39)
abort ();
}
#endif
exit (0);
}
|
