Swoole\Network\Server::onMasterStop PHP Method

    function onMasterStop($serv)
    {
        if (!empty($this->runtimeSetting['pid_file'])) {
            unlink(self::$pidFile);
        }
        if (method_exists($this->protocol, 'onMasterStop')) {
            $this->protocol->onMasterStop($serv);
        }
    }