Python如何杀死根子进程 [英] Python how to kill root subprocess

问题描述

我正在尝试使用root特权启动一个进程，并稍后将其终止.

I'm trying to launch a process with root privileges and kill it later on.

但是由于某种原因，我无法使其正常工作.

But for some reason, I can't get it to work.

这是一个小脚本，可以重现我的问题(免责声明:代码有点脏，仅用于错误重现):

Here is a small script to reproduce my problem (disclaimer: code is a bit dirty its only for bug reproduction):

import os
import time
import subprocess

command = ["sudo", "sleep", "25"]

process = subprocess.Popen(command,
                           bufsize=1,
                           stdin=open(os.devnull),
                           stderr=subprocess.PIPE,
                           stdout=subprocess.PIPE)

def kill():
    pid = process.pid
    cmd = "sudo kill %s" % pid
    print(cmd)
    print(os.system(cmd))

time.sleep(2)
kill()

stdout, stderr = process.communicate()
print("stdout: " + stdout)
print("stderr: " + stderr)
ret = process.wait()
print("ret: " + str(ret))

此代码似乎无法杀死我的子进程，但是当我在另一个python实例中启动os.system("sudo kill <pid>")时，它确实起作用.

This code doesn't seem to be able to kill my subprocess, but when I launch os.system("sudo kill <pid>") in another python instance, it does work.

推荐答案

您也可以尝试使用此方法.在这里，我试图为会话组设置一个会话ID，该进程组可能在子进程调用期间创建，并且当您想要终止时，将信号发送给进程组负责人，并将其传输到该进程的所有子进程中.组.

You may try this one too. Here what I tried to do is setting a session id to the group of processes that may get created during the subprocess call and when you want kill, a signal is sent to the process group leader, it's transmitted to all of the child processes of this group.

import signal
process = subprocess.Popen(command,
                       stderr=subprocess.PIPE,
                       stdout=subprocess.PIPE,
                       preexec_fn=os.setsid)   # add session id to group

print(process.pid)

def kill():
    pid = process.pid
    cmd = "sudo kill %s" % pid
    print(cmd)
    os.killpg(os.getpgid(process.pid), signal.SIGTERM)  # send signal to the group

time.sleep(2)
kill()

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