Python检测杀死请求 [英] Python detect kill request

问题描述

我有一个python 3脚本，它在启动时运行.而且它可以处理一些我希望在退出时免费的资源.

I have a python 3 script and it runs on boot. And it work with some resources I want it free on exit.

如果我用kill -6 $PID杀死该脚本，如何管理该脚本将退出.

How can I manage that script is going to exit if I'm killing it with kill -6 $PID.

有关如何发送出口命令并在脚本中检测出口命令的其他想法.

Or any other ideas about how to send exit command and detect it in script.

推荐答案

信号模块就是您要寻找的.

The signal module is what you are looking for.

import signal

def handler(signum, frame):
    print('Signal handler called with signal', signum)

signal.signal(signal.SIGABRT, handler)

在处理函数中，您可以以sys.exit()结尾.

Within the handler function you could terminate with sys.exit().

但是，更常见的是使用SIGINT(在终端中按CTRL + C时会发生这种情况)或SIGTERM终止程序.如果您没有清理代码，则无需编写任何代码来处理SIGINT-默认情况下，它会引发 KeyboardInterrupt 异常，如果未捕获，则为异常(这就是您应该这样做的原因永远不要使用空白的except:语句)，导致您的程序终止.

However, it is more common to use SIGINT (that's what happens when you press CTRL+C in the terminal) or SIGTERM to terminate a program. If you don't have cleanup code you don't need to write a single line of code to handle SIGINT - by default it raises a KeyboardInterrupt exception which, if not caught (that's a reason why you should never use blank except: statements), causes your program to terminate.

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