__munmap (caddr_t addr, size_t len)
__munmap (__ptr_t addr, size_t len)
__munmap (caddr_t addr, size_t len){  kern_return_t err;  if (err = __vm_deallocate (__mach_task_self (),			     (vm_address_t) addr, (vm_size_t) len))    {      errno = err;      return -1;    }  return 0;}