int fd = open(path, mode);
int fd = VmChannel.open(path, mode);
  public void openFile(String path, int mode) throws IOException  {    if (nfd.isValid() || nfd.isClosed())      throw new IOException("can't reinitialize this channel");    int fd = open(path, mode);    nfd.setNativeFD(fd);    kind = Kind.FILE;  }