async function killport(port) {
    $logger.info(`kill process on port ${port}`);
    const util = require('util');
    const exec = util.promisify(require('child_process').exec);

    try {
        // 查 PID
        let { stdout : stdout1 } = exec(`lsof -t -sTCP:LISTEN -i:${port}`)
        let pid = stdout1.trim();
        $logger.debug(`绑定端口号 ${port} 的进程 PID=${pid}`)

        // 查进程信息
        let { stdout : stdout2 } = exec(`ps -p ${pid} -o comm=`)
        let processName = stdout2.trim();
        $logger.info(`绑定端口号=${port}; 进程 PID=${pid}; 程序=${processName};`);

        // Kill 进程
        exec(`kill -9 ${pid}`)

    } catch (e) {
        if ( 1 === e.code )  {
            $logger.error("此端口未被使用，或清理进程失败。")
            return
        }
    }
}


module.exports = {
    killport
}