问题描述

我正在尝试编写一个 python 程序来测试用 C 编写的服务器.python 程序使用 subprocess 模块启动编译的服务器:

I am trying to write a python program to test a server written in C. The python program launches the compiled server using the subprocess module:

pid = subprocess.Popen(args.server_file_path).pid

这工作正常，但是如果 python 程序由于错误而意外终止，则生成的进程将继续运行.我需要一种方法来确保如果 python 程序意外退出，服务器进程也会被终止.

This works fine, however if the python program terminates unexpectedly due to an error, the spawned process is left running. I need a way to ensure that if the python program exits unexpectedly, the server process is killed as well.

更多细节:

• 仅限 Linux 或 OSX 操作系统
• 不能以任何方式修改服务器代码

推荐答案

我会atexit.register 终止进程的函数:

I would atexit.register a function to terminate the process:

import atexit
process = subprocess.Popen(args.server_file_path)
atexit.register(process.terminate)
pid = process.pid

或许:

import atexit
process = subprocess.Popen(args.server_file_path)
@atexit.register
def kill_process():
    try:
        process.terminate()
    except OSError:
        pass #ignore the error.  The OSError doesn't seem to be documented(?)
             #as such, it *might* be better to process.poll() and check for 
             #`None` (meaning the process is still running), but that 
             #introduces a race condition.  I'm not sure which is better,
             #hopefully someone that knows more about this than I do can 
             #comment.

pid = process.pid

<小时>

请注意，如果你做了一些讨厌的事情导致 python 以非优雅的方式死亡(例如，通过 os._exit 或者如果你导致 SegmentationFault 或 BusError)

Note that this doesn't help you if you do something nasty to cause python to die in a non-graceful way (e.g. via os._exit or if you cause a SegmentationFault or BusError)

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