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#include <limits.h>
#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
#define MAP_START (void *)0x7fff8000
#define MAP_LEN 0x10000
#define OFFSET (MAP_LEN/2 - 2 * sizeof (char));
f (int s, char *p)
{
int i;
for (i = s; i >= 0 && &p[i] < &p[40]; i++)
{
p[i] = -2;
}
}
main ()
{
#ifdef MAP_ANON
char *p;
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 != (char *)-1)
{
p += OFFSET;
p[39] = 0;
f (0, p);
if (p[39] != (char)-2)
abort ();
p[39] = 0;
f (-1, p);
if (p[39] != 0)
abort ();
}
#endif
exit (0);
}
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