docs: def _close(self):
          """ Close connection to remote host. """
          if self._process is None:
              return
  
          self.quit()
  
          self._process.stdin.close()
  
          logger.debug("Waiting for ssh process to finish...")
          self._process.wait()  # Wait for ssh session to finish.
  
          # self._process.terminate()
          # self._process.kill()
  
          self._process = None