How to timeout a recv() on an ssl connection?

[Grant Edwards]

I can't figure out how to timeout a recv() on an SSLSocket -- I'm using
Python 2.6 nad  2.7. Here's what I've got so far (it needs to work on
either a plain or SSL socket):

        s.settimeout(timeout)
        try:
            b = ord(s.recv(1))
        except socket.timeout:
            return None
        except ssl.SSLError as e:
            if e.message == 'The read operation timed out':
                return None
            else:
                raise
        finally:
            s.settimeout(None)
             

It works fine on normal sockets.  With an SSLSocket, it works the
first time it's called with timeout set to something other than None
(it times out properly). Subsequence reads with timeout set to None
work, but then the second time it's called with a non-None timeout, it
hangs for several minutes, and then the recv() returns an empty
string.
            
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