def run_command(self, cmd, input_data=None):
        """
        Run a command in a child process , passing it any input data specified.

        :param cmd: The command to run.
        :param input_data: If specified, this must be a byte string containing
                           data to be sent to the child process.
        :return: A tuple consisting of the subprocess' exit code, a list of
                 lines read from the subprocess' ``stdout``, and a list of
                 lines read from the subprocess' ``stderr``.
        """
        kwargs = {
            'stdout': subprocess.PIPE,
            'stderr': subprocess.PIPE,
        }
        if input_data is not None:
            kwargs['stdin'] = subprocess.PIPE
        stdout = []
        stderr = []
        p = subprocess.Popen(cmd, **kwargs)
        # We don't use communicate() here because we may need to
        # get clever with interacting with the command
        t1 = Thread(target=self._reader, args=('stdout', p.stdout, stdout))
        t1.start()
        t2 = Thread(target=self._reader, args=('stderr', p.stderr, stderr))
        t2.start()
        if input_data is not None:
            p.stdin.write(input_data)
            p.stdin.close()

        p.wait()
        t1.join()
        t2.join()
        return p.returncode, stdout, stderr

        Run a command in a child process , passing it any input data specified.

        :param cmd: The command to run.
        :param input_data: If specified, this must be a byte string containing
                           data to be sent to the child process.
        :return: A tuple consisting of the subprocess' exit code, a list of
                 lines read from the subprocess' ``stdout``, and a list of
                 lines read from the subprocess' ``stderr``.
        
product/gradle-plugin/src/main/python/pip/_vendor/distlib/index.py