在python中杀死sudo启动的子进程 [英] Killing sudo-started subprocess in python

问题描述

我与一个可以进行根级调用而无需提供密码的用户一起运行.我的用户当前正在执行类似操作

I am running with a user that can make root-level calls without having to supply a password. My user currently does something like this

pr = subprocess.Popen("sudo sleep 100".split())
sleep(5)
pr.kill()

但这会导致此错误，因为用户不是root用户，因此无法杀死root用户进程

but that leads to this error because the user isn't root so it can't kill a root process

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 1572, in kill
    self.send_signal(signal.SIGKILL)
  File "/usr/lib/python2.7/subprocess.py", line 1562, in send_signal
    os.kill(self.pid, sig)
OSError: [Errno 1] Operation not permitted

所以我尝试做这样的事情

so I try to do something like this

pr = subprocess.Popen("sudo sleep 100".split())
sleep(5)
kill_pr = subprocess.Popen("sudo kill {}".format(pr.pid))

但这并不会杀死有问题的进程.例如，如果

but that doesn't kill the process in question. For example, if

>> subprocess.Popen("sudo sleep 100".split()).pid
5000

但是

$ pgrep sleep
5001

所以从subprocess.Popen("..").pid返回的pid似乎比运行我要杀死的命令的进程的实际pid高

so it seems that the pid returned from subprocess.Popen("..").pid is one higher than the actual pid of the process running the command that I want to kill

我假设从Popen调用返回的pid是父进程，所以我尝试做类似的事情

I'm assuming that the pid returned from the Popen call is the parent process, so I try doing something like

sudo kill -- -$PID，其中$PID是从Popen返回的那个，但这只是给我

sudo kill -- -$PID, where $PID is the one returned from Popen, but that just gives me

kill: sending signal to -2100 failed: No such process

为什么不存在该进程?

本质上，我只需要一种使用python的子进程在sudo中运行命令的方法，然后能够在需要时将其杀死.我假设我需要在要杀死的进程的pid上运行某种类型的sudo kill命令，或者类似的操作，但是我无法确切确定如何执行此操作.

Essentially, I just need a way to run a command with sudo using python's subprocess, then be able to kill it when I need to. I'm assuming I need to run some type of sudo kill command with the pid of the process I'm trying to kill or something like that but I'm unable to determine exactly how to do this.

推荐答案

我想我明白了，问题是如果我这样做了

I think I figured it out, the issue was that if I did this

import subprocess, os
pr = subprocess.Popen(["sudo", "sleep", "100"])
print("Process spawned with PID: %s" % pr.pid)
pgid = os.getpgid(pr.pid)
subprocess.check_output("sudo kill {}".format(pgid))

它将终止启动python解释器的进程

it would kill the process that started the python interpreter

>>> Terminated

所以我将preexec_fn设置为os.setpgrp

import subprocess, os
pr = subprocess.Popen(["sudo", "sleep", "100"], preexec_fn=os.setpgrp)
print("Process spawned with PID: %s" % pr.pid)
pgid = os.getpgid(pr.pid)
subprocess.check_output("sudo kill {}".format(pgid))

在另一个外壳中(如果我检查的话)

in another shell, if I check

pgrep sleep

什么都没有出现，所以实际上被杀死了.

nothing shows up, so it is actually killed.

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