__init__.py 文件源码

def stop(self):
        if self.process is None:
            return
        try:
            os.killpg(os.getpgid(self.process.pid), self.stop_signal)
        except OSError:
            # Process is already gone
            pass
        else:
            kill_time = time.time() + self.kill_after
            while time.time() < kill_time:
                if self.process.poll() is not None:
                    break
                time.sleep(0.25)
            else:
                try:
                    os.killpg(os.getpgid(self.process.pid), 9)
                except OSError:
                    # Process is already gone
                    pass
        self.process = None