_file = fopen(file, "r");
  _line_no = 0;
  _interfaces = new (ResourceObj::C_HEAP, mtClass) GrowableArray<int>(10, true);

  if (_file == NULL) {
    char errmsg[JVM_MAXPATHLEN];
    os::lasterror(errmsg, JVM_MAXPATHLEN);
    vm_exit_during_initialization("Loading classlist failed", errmsg);
  }

'errno' from the fopen may have been overwritten inside the allocation logic (particularly if logging is enabled) by the time we call os::lasterror.