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Modifying the system os.py is not a good idea. A better
work-around is to skip the /dev/urandom fd when you are
closing all fds. This is the code we use:

def close_fd():
  # close all inherited file descriptors
  start_fd = 3
  # Python 2.4.1 and later use /dev/urandom to seed the
random module's RNG
  # a file descriptor is kept internally as os._urandomfd
(created on demand
  # the first time os.urandom() is called), and should not
be closed
  try:
    os.urandom(4)
    urandom_fd = getattr(os, '_urandomfd', None)
  except AttributeError:
    urandom_fd = None
  if '-close_fd' in sys.argv:
    start_fd = int(sys.argv[sys.argv.index('-close_fd') + 1])
  for fd in range(start_fd, 256):
    if fd == urandom_fd:
      continue
    try:
      os.close(fd)
    except OSError:
      pass