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Date:      Tue, 9 Feb 1999 07:56:12 -0800 (PST)
From:      Julian Elischer <julian@whistle.com>
To:        Brian McGovern <bmcgover@cisco.com>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: Docs on line disciplines?
Message-ID:  <Pine.BSF.4.05.9902090754330.276-100000@s204m82.isp.whistle.com>
In-Reply-To: <199902091441.JAA02508@bmcgover-pc.cisco.com>

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check out the netgraph "tty" node..

does a lot of wht you want..
and is dynamically loadable.

ftp://ftp.whistle.com/pub/archie/netgraph/index.html
(look at this in netscape)

julian



On Tue, 9 Feb 1999, Brian McGovern wrote:

> I'm looking to see if anyone can point me at documents for implementing a new
> line discipline... I'm looking at creating something that will take a
> set of data (Voice RTP packets, to be precise), and handle packetizing it 
> while passing it up.
> 
> The idea is to take a character at a time from the tty driver (a la l_rint),
> and watch for special escaping of the character using the upper 8 bits
> (ie - Start of Frame and End of Frame), then buffer the characters until
> we have a complete packet of data. Then, I want to throw some header info
> on the front end, and a trailer on the back, and stuff it in to the right
> part of the clist for the tty (t_rawq or t_canq).
> 
> On the write side, I want to be able to strip off the header and trailer,
> then present the data to t_outq with the Start of Frame and End of Frame
> characters properly escaped.
> 
> So, any docs that give a primer for starting these types of things would
> be most appreciated.
> 
> 	-Brian
> 
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