#!/usr/bin/env python3
import os, sys

# получаем PID указанного окна
pid = os.popen('xprop -notype _NET_WM_PID').read().split(' = ')[1].strip()

# узнаем статус этого PID c помощью ps
# user      4768 50.0  2.0 575392 167484 pts/0   S    18:11  19:32 /home/user/bin/jackhammer/jackhammer
parts = os.popen('ps -up {}'.format(pid)).read().split('\n')[1].split(' ')
parts = [p.strip() for p in parts if p.strip()]

# ['user', '1306', '0.0', '0.5', '595328', '42912', 'tty1', 'Sl', '17:49', '0:02', 'python2', '/usr/bin/guake']
# T – Stopped, either by a job control signal or because it is being traced.
status = parts[7]

if 'T' in status.upper():
    signal = 18 # start
    msg = 'process {} started'.format(pid)
else:
    signal = 19 # freeze
    msg = 'process {} freezed'.format(pid)

# шлем сигнал
os.system('kill -{} {}'.format(signal, pid))
# показываем уведомление
os.system('notify-send -t 2000 "{}"'.format(msg))