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Subject: Re: socket_read?
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From: Jeff Trawick <trawickj@bellsouth.net>
Date: 17 Feb 2001 16:50:25 -0500
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Ben Laurie <ben@algroup.co.uk> writes:

> But the caller typically _does_ care if its EOF, 

if you're talking about filters, I would contend that the caller
typically cares about eos, not EOF

eos is the bucket brigade equivalent to EOF in traditional file
reading

an EOF condition on the underlying read operation of a particular
bucket may or may not mean that it is the end of the brigade for the
filter to process

>                                         so I don't see why this
> is a win - if it doesn't do that, then I have to add this to mod_tls:
> 
> 	if(ret == APR_SUCCESS && len == 0 && eReadType == APR_BLOCK_READ)
> 	    ret=APR_EOF;
> 
> which strikes me as absurd!

I'm not sure what you're trying to accomplish.  Are you an input
filter?  Is the end of the connection?  Add an eos bucket to what you
return to the caller.  Is there simply no data available from the
client yet?  Return the brigade you have so far.

> Hmm. I suppose I then have to insert a 0 length bucket into the outgoing
> brigade if we're blocking, in order to be consistent. That's crazy,
> isn't it? Am I missing something?

I probably don't understand the situation, and you've probably hit a
situation that is different than other filters have encountered thus
far.  Different stuff happens at source and sink, and you are both I
suspect. 

-- 
Jeff Trawick | trawickj@bellsouth.net | PGP public key at web site:
       http://www.geocities.com/SiliconValley/Park/9289/
             Born in Roswell... married an alien...