node.js, process.kill() 和 process.exit(0), 哪一个可以杀死进程？

Question

我阅读了 node.js 文档。它说:

Even though the name of this function is process.kill(), it is really just a signal sender, as the kill system call. The signal sent may do something other than killing the target process.

console.log('current process id: ', process.pid);

process.on('SIGHUP', function() {
  console.log('Got SIGHUP signal');
});

setTimeout(() => {
  console.log('Exiting...');
  process.exit(0);  //kill process
  console.log('Process id that has exited: ', process.pid); //does not output
}, 1000);

process.kill(process.pid, 'SIGHUP'); //does not kill process
console.log('Id of the process exiting: ', process.pid); //so this output normally

输出:

current process id:  64520
Id of the process exiting:  64520
Got SIGHUP signal
Exiting...

process.exit(0) 似乎是杀死 node.js 进程的进程。

Answer 1

这完全取决于您所处的情况。正如 Gospal Joshi 所说，process.exit([code]) 对于快速结束进程很有用。但在其他情况下，您可能希望在关闭之前向该进程传递一个信号以进行清理/正常关闭。例如，如果您正在收听信号事件，例如:

process.on('SIGINT', () => {
  //do something
}

它允许您运行清理或优雅地关闭进程，而不是立即退出而不做任何事情。

另请注意，Node.js 为 SIGINT 和 SIGTERM 建立信号处理程序，Node.js 进程不会因收到这些信号而立即终止。相反，Node.js 将执行一系列清理操作，然后重新发出已处理的信号 - Node Documentation