kill subprocess when python process is killed?

process, python, windows

Solution

Windows doesn't have signals, so you can't use the signal module. However, you can still catch the KeyboardInterrupt exception when Ctrl-C is pressed.

Something like this should get you going:

import subprocess

try:
    child = subprocess.Popen(blah)
    child.wait() 

except KeyboardInterrupt:
    child.terminate()

Problem

I am writing a python program that lauches a subprocess (using Popen). I am reading stdout of the subprocess, doing some filtering, and writing to stdout of main process. When I kill the main process (cntl-C) the subprocess keeps running. How do I kill the subprocess too? The subprocess is likey to run a long time. Context: I'm launching only one subprocess at a time, I'm filtering its stdout. The user might decide to interrupt to try something else. I'm new to python and I'm using windows, so please be gentle.

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