如何检测python脚本是否正在作为后台进程运行

问题描述

有没有办法判断我的python脚本是否正在作为后台进程运行?我试图区分这两个:

Is there a way to tell whether my python script is running as a background process or not? I'm trying to differentiate between these two:

sudo ./myscript.py
sudo ./myscript.py &

使用sys.argv不起作用-显然，&"号不算作参数.而以下内容的结果将是什么:

Using sys.argv doesn't work - the ampersand doesn't count as an argument apparently. And what would be the effect of the following instead:

sudo python myscript.py
sudo python myscript.py &

我环顾四周，但是似乎所有事情都与从Python脚本中启动后台进程有关，而不是与Python脚本本身是否是后台进程无关.谢谢！

I've had a look around, but everything seems to be about starting a background process from within a Python script, not whether the Python script itself is a background process. Thanks!

目的是(正常情况下)输出(或不输出) ie "Press Ctrl+C to stop this script"消息，但如果以后台进程.

The aim is to output a message (or not), i.e. "Press Ctrl+C to stop this script" if started normally, but don't display the message if started as a background process.

编辑2 我忽略了提及此python脚本将由以下脚本中的一个启动/etc/init.d，而不是在终端提示符下.因此，标记为正确的答案确实可以按照我的表述和给出的信息回答该问题，但是我想指出，在init.d场景中它不起作用，以避免将来出现任何潜在的混乱.

EDIT 2 I neglected to mention that this python script will be started by a script in/etc/init.d rather than from a terminal prompt. So the answer marked as correct does indeed answer the question as I phrased it and with the information given, but I thought I should point out that it doesn't work in the init.d scenario, to avoid any potential confusion in the future.

推荐答案

基于 @AaronDigulla的答案:

Based on the answer for C @AaronDigulla pointed to in a comment:

import os
import sys


def main():
    if os.getpgrp() == os.tcgetpgrp(sys.stdout.fileno()):
        print 'Running in foreground.'
    else:
        print 'Running in background.'


if __name__ == '__main__':
    main()

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