#!/usr/bin/env python

import os, fcntl

fd = os.open("/tmp/exploit-counter", os.O_RDWR | os.O_CREAT, 0644)
fcntl.lockf(fd, fcntl.LOCK_EX)

f = os.fdopen(fd, "w+")
n = int(f.read()) + 1
f.seek(0)
f.write(str(n))
f.close()

print "Content-type: text/plain\r\n\r\n... but not today, eh?", n