Thanks, I'll try it in a bit.

My knowledge of Python is pretty much nil. I haven't had any real coding background whatsoever. I've tinkered and modified some stuff ini files for the original xbox to help automate flashing bios and setting up hard drives the way I like it. But that's really it. I usually take other peoples code and modify it to suit my needs. I would like to go back to college someday to learn about coding. Thanks for the input.

Yeah, I've copied and pasted it from a Reddit thread. Here is where I got it from.
https://www.reddit.com/r/raspberry_pi/comments/2yw4fn/finally_set_up_retropie_complete_with_a_gpio/

I really like the look and feel of RecalBox and wanted to use it in my other pi but had a few hiccups a long the way. One of them being this emulator exit button that I cannot get working on RecalBox. I think the other was the SNES GPIO adapter which I have kind of figured out.

I was curious as to modify an existing script to work from retropie to RecalBox. I've got a button wired up to a GPIO pin to exit out of all the emulators on RetroPie 3.8 and on 4.0 Beta. However when I try to use the same script in RecalBox I can see the button output on the terminal screen when pressed. I've used this in the event the emulator freezes up and hotkeys don't work, I can still get back to emulation station.
from time import sleep

import os
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

def exitEmulator(channel):
    print('exitEmulator')
    pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]

    for pid in pids:
        try:
            commandpath = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
            if commandpath[0:24] == '/opt/retropie/emulators/':
                os.system('kill -QUIT %s' % pid)
                print('kill -QUIT %s' % pid)
        except IOError:
            continue
GPIO.add_event_detect(17, GPIO.RISING, callback=exitEmulator, bouncetime=500)

while True:
    sleep(10)

Thanks

Here