fork version

import select
import time
import os

r, w = os.pipe()
pid = os.fork()
if pid:
  i, o, e =select.select([r],[], [], 3)
  assert not o
  assert not e
  if i:
    print 'done! with ', os.read(r, 1000)
  else:
    print 'time out'
else:
  time.sleep(2)
  os.write(w, '1000')