support for starttls

[Sebastian Spaeth]

On Mon, 11 Apr 2011 15:27:27 +0200, Johannes Stezenbach <js at sig21.net> wrote:
> IMAP4.open() connects to the server, then sets self.read_fd
> and starts the self._reader thread, which uses select()
> and read() on the socket.
> 
> Then starttls() calls ssl.wrap_socket() and updates self.read_fd,
> but it seems the self._reader thread eats part of the SSL handshake.
> 
> I think to fix this starttls() needs to be done before
> starting the self._reader thread.  (Or the thread needs to be killed
> before ssl.wrap_socket() and restarted afterwards.)

Great analysis. I concur that this is what must be happening. I
forwarded your analysis to Piers the imaplib2 author. Let's see if he
fixes it.

Sebastian
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