[Dovecot] adding a select or a poll?

[ohp at pyrenet.fr]

Since I put my hands on dovecot, I had this recuring problem at startup:

Imap-login would'nt connect to the 'default' socket.
I've been strugling with the fact that it would eventually connect on a
slow or moderely fast machine but not on a really fast machine.

According to Unixware doc, the FIRST connect ALWAYS returns -1 and
errno=EINPROGRESS

AFAICT, imap loop is like this:

while (1)
connect
if no error bu EINPROGRESS
send_handshake
if successfull
   break;
end while

Now, I think the time between connect and send_handshake might be too
short for async connect to finish in most case.

I recognize is a Unixware probleme but I think this senario can happen on
any system that CAN set errno to EINPROGRESS.

I think the two possibilities are
1 - remove the setting of NONBLOCK before connecting to unix sock, but
that would  ruin the way dovecot is written.
2 - add a poll or a select before send_handshake to be sure the socket is
writable.

The third way would be to tell unixware users to disable async connects
methink would be a pitta.

What do you think?

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Olivier PRENANT        	        Tel: +33-5-61-50-97-00 (Work)
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