使用子进程时如何限制程序的执行时间? [英] How to limit program's execution time when using subprocess?

问题描述

我想使用子流程来运行程序，并且需要限制执行时间.例如，如果它运行超过2秒，我想杀死它.

I want to use subprocess to run a program and I need to limit the execution time. For example, I want to kill it if it runs for more than 2 seconds.

对于常见程序，kill()效果很好.但是，如果我尝试运行/usr/bin/time something，kill()并不能真正终止程序.

For common programs, kill() works well. But if I try to run /usr/bin/time something, kill() can’t really kill the program.

我下面的代码似乎无法正常工作.该程序仍在运行.

My code below seems doesn’t work well. The program is still running.

import subprocess
import time

exec_proc = subprocess.Popen("/usr/bin/time -f \"%e\\n%M\" ./son > /dev/null", stdout = subprocess.PIPE, stderr = subprocess.STDOUT, shell = True)

max_time = 1
cur_time = 0.0
return_code = 0
while cur_time <= max_time:
    if exec_proc.poll() != None:
        return_code = exec_proc.poll()
        break
    time.sleep(0.1)
    cur_time += 0.1

if cur_time > max_time:
    exec_proc.kill()

推荐答案

在命令行中执行以下操作:

do it like so in your command line:

perl -e 'alarm shift @ARGV; exec @ARGV' <timeout> <your_command>

这将运行命令<your_command>并在<timeout>秒内终止它.

this will run the command <your_command> and terminate it in <timeout> second.

一个虚拟的例子:

# set time out to 5, so that the command will be killed after 5 second 
command = ['perl', '-e', "'alarm shift @ARGV; exec @ARGV'", "5"]

command += ["ping", "www.google.com"]

exec_proc = subprocess.Popen(command)

，或者如果您使用 signal.alarm ()，想要与python一起使用，但它是相同的.

or you can use the signal.alarm() if you want it with python but it's the same.

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