nodejs - 如果一个进程调用退出，分叉进程会被杀死吗？

Question

我需要 fork/spawn 从我的主节点应用程序处理。此进程应该运行 "endless" 因为它们检查文件系统以了解不同文件夹中的更改并处理新文件。

我按以下方式分叉进程：

var processes = [];
var fork = require('child_process').fork;

var processList = [
    {'servicename':'faxservice1'}, 
    {'servicename':'faxservice2'},
    {'servicename':'faxservice3'}
];

timeOutValue = 10000;

processList.forEach(Service => {

    var cp = fork(['./modules/services/inbound/fax/service.js']);


    cp.on('close', function() {
        console.log('child process has ended');
        process.exit();
    })

    cp.on('message', (m) => {
        console.log(`SVC | ${m}`);
    });

    setTimeout(function() {
        cp.send('stop');
    }, timeOutValue);    

    // Push spawned process to process-array
    processes.push(cp);

    timeOutValue = timeOutValue + 5000;
});

子进程执行以下操作：

const svcName = 'FAX-INBOUND';

var chokidar = require('chokidar');
var watcher = chokidar.watch('file, dir, or glob', {
    ignored: /[\/\]\./, persistent: true
  });

var log = console.log.bind(console);

var args = process.argv.slice(2);
console.log(`${svcName} | ${args} | starting`);

process.on('message', (m) => {
    console.log(`${svcName} | ${m} | Service termination command recieved from host`);
    process.exit();
});




watcher
      .on('add', function(path) { log(svcName + " | " + 'File', path, 'has been added'); })
      .on('addDir', function(path) { log(svcName + " | " + 'Directory', path, 'has been added'); })
      .on('change', function(path) { log(svcName + " | " + 'File', path, 'has been changed'); })
      .on('unlink', function(path) { log(svcName + " | " + 'File', path, 'has been removed'); })
      .on('unlinkDir', function(path) { log(svcName + " | " + 'Directory', path, 'has been removed'); })
      .on('error', function(error) { log(svcName + " | " + 'Error happened', error); })
      .on('ready', function() { log(svcName + " | " + 'Initial scan complete. Ready for changes.'); })
      .on('raw', function(event, path, details) { log(svcName + " | " + 'Raw event info:', event, path, details); })

如果我运行显示的代码，我在日志中看到分叉的三个进程：

FAX-INBOUND |  | starting
FAX-INBOUND |  | starting
FAX-INBOUND | Initial scan complete. Ready for changes.
FAX-INBOUND | Initial scan complete. Ready for changes.
FAX-INBOUND |  | starting
FAX-INBOUND | Initial scan complete. Ready for changes.

setTimeout 仅用于调试目的，应该向三个分叉进程分别发送一条消息，每个进程有 5 秒的延迟。生成的进程收到消息后，它们应该退出。

BUT 在控制台我只看到 one 分叉进程的控制台输出：

FAX-INBOUND | stop | Service termination command recieved from host

看来，如果一个分叉进程调用

process.exit()

所有分叉进程都被杀死了？

我做错了什么？

此致

Answer 1

在 "cp.on('close', ...)" 中，您会在子进程死亡后立即退出父进程。这反过来会杀死所有分叉的进程，因为它们没有用 option.detached=true

分叉

nodejs - 如果一个进程调用退出，分叉进程会被杀死吗？

nodejs - forked processes get killed if one process calls exit?

fork

child-process

node.js