捕获 Ctrl-C 信号并等待子进程

问题描述

我有一些 python 代码，我在其中调用了一个子进程，在 python 脚本中，我想捕获 SIGINT 信号，并等待子进程完成.目前，当我按 ctrl-c 时，我所拥有的会杀死进程.有什么方法可以告诉 python 等待进程完成?虽然我想等待该过程，但我确实希望该脚本在该过程完成后死亡，不确定是否有办法做到这一点.

I have a bit of python code in which I call a subprocess, and within the python script I want to capture the SIGINT signal, and wait for the subprocess to finish. Currently what I have kills the process when I ctrl-c. Any way to tell python to wait for the process to finish?Although I want to wait for the process, I do want the script to die after the process finishes, not sure if theres a way to do this.

import subprocess as sp
from celery.platforms import signals

def outer_fun():
    p = None

    def signal_handler(signum, frame):
        if p != None:
            p.wait()

signals['INT'] = signal_handler

p = sp.Popen(['sleep','30'])
result = p.wait()

print result[0]

outer_fun()

推荐答案

找到了一个解决方案，虽然不是我预期的效果！使用 preexec_fn=os.setpgrp 选项，ctrl c 信号不会发送到子进程.

Found a solution, although not what I expected it works! With the preexec_fn=os.setpgrp option the ctrl c signal is not sent to the subprocess.

p = sp.Popen(cmd, preexec_fn=os.setpgrp)

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