emulator.py 文件源码

def stop(self):
        """Stop the emulator process.

        Returns:
          int: The process return code or None if the process isn't
          currently running.
        """
        if self._proc is not None:
            if self._proc.poll() is None:
                try:
                    os.killpg(self._proc.pid, signal.SIGTERM)
                    _, returncode = os.waitpid(self._proc.pid, 0)
                    self._logger.debug("Emulator process exited with code %d.", returncode)
                    return returncode
                except ChildProcessError:  # pragma: no cover
                    return self._proc.returncode
            return self._proc.returncode  # pragma: no cover
        return None  # pragma: no cover