Node.JS 父进程 ID [英] Node.JS Parent Process ID

问题描述

是否可以使用 Node.JS 获取父进程 ID?我想检测父母是否以无法通知孩子的方式被杀死或失败.如果发生这种情况，子进程的父进程 id 应该变为 1.

Is it possible to get the parent process-id using Node.JS? I would like to detect if the parent is killed or fails in such a way that it cannot notify the child. If this happens, the parent process id of the child should become 1.

这比要求父级定期发送保持活动信号更可取，也比运行 ps 命令更可取.

This would be preferable to requiring the parent to periodically send a keep-alive signal and also preferable to running the ps command.

推荐答案

您可以使用 pid-file.类似的东西

You can use pid-file. Something like that

var util = require('util'),
    fs = require('fs'),
    pidfile = '/var/run/nodemaster.pid';

try {
    var pid = fs.readFileSync(pidfile);
    //REPLACE with your signal or use another method to check process existence :)
    process.kill(pid, 'SIGUSR2'); 
    util.puts('Master already running');
    process.exit(1);
} catch (e) {
    fs.writeFileSync(pidfile, process.pid.toString(), 'ascii');
}

//run your childs here

您也可以在 spawn() 调用中将 pid 作为参数发送

Also you can send pid as argument in spawn() call

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