[Dovecot] 1.0-test26

[Timo Sirainen]

On 9.7.2004, at 00:57, Mark E. Mallett wrote:

> On Fri, Jul 09, 2004 at 12:34:04AM +0300, Timo Sirainen wrote:
>> http://dovecot.org/test/
>>
>>  - Fixed APPEND hanging if the whole message was sent in one TCP 
>> packet
>> (ie. fixes the "Sent mail" hangs)
>
> Curious-- how does the application-level code care about TCP packets?

It reads all of it into buffer, then later tries to read more even 
though everything was already in that buffer so it gets stuck at 
waiting. Dovecot's istream-limit wrapper stream specifically was a 
problem. It called parent stream's read() function without checking 
first if there was already data in it's buffer.

These wrapper streams have been quite difficult in general. mbox 
support is implemented using one of those too and it took quite a while 
to get it working correctly. I guess I should write some comments there 
how exactly they should be implemented.
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