return map(nfd.getNativeFD(), mode, position, size);
return VmChannel.map(nfd.getNativeFD(), mode, position, size);
  public MappedByteBuffer map(char mode, long position, int size)    throws IOException  {    if (kind != Kind.FILE)      throw new IOException("not a file");    return map(nfd.getNativeFD(), mode, position, size);  }