Subversion Repositories scarts

#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 (char));

f (int s, char *p)

{

  int i;

  for (i = s; &p[i] < &p[40] && i >= 0; 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);

}