Process monitor

monitor.py

#!/usr/bin/env python

import os, re, signal, subprocess

def monitor():
    print "Starting procedure"

    p = subprocess.Popen('./problematic_procedure.py',
                        stdout=subprocess.PIPE
                        )

    while p.poll() is None:
        line = p.stdout.readline()
        print "Procedure output was %s" % line
        if re.match('bad', line):
            os.kill(p.pid, signal.SIGTERM)
            print "Procedure failed so I killed it"
            monitor()

monitor()
print 'Procedure exited'

problematic_procedure.py

#!/usr/bin/env python

import random, sys, time

while True:
    r = random.randint(1,6) 
    if r == 1:
        sys.exit()
    elif r == 2 or r == 3:
        print "bad"
        sys.stdout.flush()
    else:
        print "good"
        sys.stdout.flush()
    time.sleep(1)