scan_proc.py

#!/usr/bin/env python

import re
import os
import time
import signal
import sys

class TopState:
    Running     = 1
    NotRunning  = 2


topState  = TopState.NotRunning


def pid_dirs_only(list, filter):
    return [l for l in list if filter.search(l)]


def is_ps_monitoring_tool(process_name):
    return any(process_name in s for s in ['(ps)', '(top)'])

def rescan():
    global proc_pids
    print("Rescaning...")

    for pid in pid_dirs_only(os.listdir('/proc'), re.compile('^[0-9]+$')):
        try:
            with open('/proc/' + pid + '/stat', 'r') as f:
                status = f.readline().split()
                if is_ps_monitoring_tool(status[1]):
                    print('{0} {1} is running'.format(status[0], status[1]))
                    return TopState.Running
        except FileNotFoundError as err:
            pass

    print("Done")
    return TopState.NotRunning

prev = 0
cur  = 0

def main():
    global prev
    global cur

    while True:
        with open('/proc/loadavg', 'r') as f:
            cur = int(f.readline().split()[3].split('/')[1])
            if prev != cur:
                prev = cur
                if rescan() == TopState.Running:
                    print("Hide")
                else:
                    print("Show")

        time.sleep(0.001)


if __name__ == "__main__":
    main()