如何终止使用 shell=True 启动的 python 子进程 [英] How to terminate a python subprocess launched with shell=True

问题描述

我正在使用以下命令启动一个子进程:

I'm launching a subprocess with the following command:

p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)

但是，当我尝试使用以下方法杀死时:

However, when I try to kill using:

p.terminate()

或

p.kill()

该命令一直在后台运行，所以我想知道如何才能真正终止该进程.

The command keeps running in the background, so I was wondering how can I actually terminate the process.

请注意，当我使用以下命令运行命令时:

Note that when I run the command with:

p = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)

在发出 p.terminate() 时它确实成功终止.

It does terminate successfully when issuing the p.terminate().

推荐答案

使用 进程组以便能够向组中的所有进程发送信号.为此，您应该将 会话 ID 附加到衍生/子进程，在您的情况下是一个外壳.这将使它成为流程的组长.所以现在，当一个信号被发送到进程组组长时，它会被传输到这个组的所有子进程.

Use a process group so as to enable sending a signal to all the process in the groups. For that, you should attach a session id to the parent process of the spawned/child processes, which is a shell in your case. This will make it the group leader of the processes. So now, when a signal is sent to the process group leader, it's transmitted to all of the child processes of this group.

代码如下:

import os
import signal
import subprocess

# The os.setsid() is passed in the argument preexec_fn so
# it's run after the fork() and before  exec() to run the shell.
pro = subprocess.Popen(cmd, stdout=subprocess.PIPE, 
                       shell=True, preexec_fn=os.setsid) 

os.killpg(os.getpgid(pro.pid), signal.SIGTERM)  # Send the signal to all the process groups

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