gimxstatus.py

#!/bin/python
import os
import time
import RPi.GPIO as GPIO

# set GPIO pin 7 as output
GPIO.setmode(GPIO.BCM)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(18, GPIO.IN, pull_up_down = GPIO.PUD_UP)

def Shutdown(channel):  
  os.system("sudo shutdown -h now")

GPIO.add_event_detect(18, GPIO.FALLING, callback = Shutdown, bouncetime = 2000)

while True:
  found = False
  time.sleep(5)
  pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]
  for pid in pids:
    try:
      cmd = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
      if "gimx" in cmd:
        found = True
      except IOError: # proc has already terminated
        continue
   if found == True:
     GPIO.output(7, True)
   else
     GPIO.output(7, False)