test program on page zero mapping

conftest.cpp

/* confdefs.h */
 #define PACKAGE_NAME "Basilisk II"
 #define PACKAGE_TARNAME "BasiliskII"
 #define PACKAGE_VERSION "1.0"
 #define PACKAGE_STRING "Basilisk II 1.0"
 #define PACKAGE_BUGREPORT "Christian.Bauer@uni-mainz.de"
 #define PACKAGE_URL ""
 #define STDC_HEADERS 1
 #define HAVE_SYS_TYPES_H 1
 #define HAVE_SYS_STAT_H 1
 #define HAVE_STDLIB_H 1
 #define HAVE_STRING_H 1
 #define HAVE_MEMORY_H 1
 #define HAVE_STRINGS_H 1
 #define HAVE_INTTYPES_H 1
 #define HAVE_STDINT_H 1
 #define HAVE_UNISTD_H 1
 #define __EXTENSIONS__ 1
 #define _ALL_SOURCE 1
 #define _GNU_SOURCE 1
 #define _POSIX_PTHREAD_SEMANTICS 1
 #define _TANDEM_SOURCE 1
 #define PACKAGE "Basilisk II"
 #define VERSION "1.0"
 #define HAVE_LIBRT 1
 #define HAVE_LIBRT 1
 #define HAVE_LIBM 1
 #define HAVE_PTHREADS 1
 #define HAVE_PTHREAD_COND_INIT 1
 #define HAVE_PTHREAD_CANCEL 1
 #define HAVE_PTHREAD_TESTCANCEL 1
 #define HAVE_PTHREAD_MUTEXATTR_SETPROTOCOL 1
 #define HAVE_PTHREAD_MUTEXATTR_SETTYPE 1
 #define HAVE_PTHREAD_MUTEXATTR_SETPSHARED 1
 #define HAVE_SEM_INIT 1
 #define ENABLE_GTK 1
 #define STDC_HEADERS 1
 #define HAVE_STDLIB_H 1
 #define HAVE_STDINT_H 1
 #define HAVE_UNISTD_H 1
 #define HAVE_FCNTL_H 1
 #define HAVE_SYS_TYPES_H 1
 #define HAVE_SYS_TIME_H 1
 #define HAVE_SYS_MMAN_H 1
 #define HAVE_READLINE_READLINE_H 1
 #define HAVE_READLINE_HISTORY_H 1
 #define HAVE_SYS_SOCKET_H 1
 #define HAVE_SYS_IOCTL_H 1
 #define HAVE_SYS_BITYPES_H 1
 #define HAVE_SYS_WAIT_H 1
 #define HAVE_SYS_POLL_H 1
 #define HAVE_SYS_SELECT_H 1
 #define HAVE_ARPA_INET_H 1
 #define HAVE_LINUX_IF_H 1
 #define HAVE_LINUX_IF_TUN_H 1
 #define HAVE_NET_IF_H 1
 #define SIZEOF_SHORT 2
 #define SIZEOF_INT 4
 #define SIZEOF_LONG 8
 #define SIZEOF_LONG_LONG 8
 #define SIZEOF_FLOAT 4
 #define SIZEOF_DOUBLE 8
 #define SIZEOF_LONG_DOUBLE 16
 #define SIZEOF_VOID_P 8
 #define HAVE_LOFF_T 1
 #define HAVE_CADDR_T 1
 #define RETSIGTYPE void
 #define TIME_WITH_SYS_TIME 1
 #define HAVE_STRDUP 1
 #define HAVE_STRERROR 1
 #define HAVE_CFMAKERAW 1
 #define HAVE_CLOCK_GETTIME 1
 #define HAVE_TIMER_CREATE 1
 #define HAVE_SIGACTION 1
 #define HAVE_SIGNAL 1
 #define HAVE_MMAP 1
 #define HAVE_MPROTECT 1
 #define HAVE_MUNMAP 1
 #define HAVE_POLL 1
 #define HAVE_INET_ATON 1
 #define HAVE_STRINGS_H 1
 #define HAVE_SYS_STAT_H 1
 #define HAVE_PTY_H 1
 #define HAVE_VHANGUP 1
 #define HAVE_SLIRP 1
 #define USE_SDL 1
 #define USE_SDL_VIDEO 1
 #define USE_SDL_AUDIO 1
 #define ENABLE_TUNTAP 1
 #define HAVE_MMAP_VM 1
 #define HAVE_MMAP_ANON 1
 #define HAVE_MMAP_ANONYMOUS 1
 #define HAVE_MMAP_VM 1
 /* end confdefs.h.  */

#include "/home/Ricky/repo/github/macemu/BasiliskII/src/CrossPlatform/vm_alloc.cpp"
#include <stdio.h>
    int main(void) { /* returns 0 if we could map the lowmem globals */
      volatile char * lm = 0;
      if (vm_init() < 0) exit(1);
      if (vm_acquire_fixed(0, 0x2000) < 0) exit(1);
      lm[0] = 'z';
      if (vm_release((char *)lm, 0x2000) < 0) exit(1);
      vm_exit(); exit(0);
    }