Date: Thu, 16 Mar 1995 12:17:23 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: bde@zeta.org.au (Bruce Evans) Cc: freebsd-hackers@freefall.cdrom.com Subject: Re: Splicing in a new serial line protocol Message-ID: <199503161717.MAA04543@hda.com> In-Reply-To: <199503161710.DAA31846@godzilla.zeta.org.au> from "Bruce Evans" at Mar 17, 95 03:10:38 am
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Bruce Evans writes:
>
> >Would anyone care to comment on where to splice in a new serial line
> >protocol? I haven't looked at the code at all yet; I plan on looking
> >later on today.
>
> Look at if_sl.c. Don't cp it :-).
After looking I'm not tempted... That would be awful big hammer.
I immediately notice this:
/*
* SLIP ABORT ESCAPE MECHANISM:
* (inspired by HAYES modem escape arrangement)
* 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape }
* within window time signals a "soft" exit from slip mode by remote end
* if the IFF_DEBUG flag is on.
*/
Has anyone ever seen discussion about Hayes US patent 4,549,302
(where they claim a patent on the idea of pausing after an escape
sequence) and this code?
Peter
--
Peter Dufault Real Time Machine Control and Simulation
HD Associates, Inc. Voice: 508 433 6936
dufault@hda.com Fax: 508 433 5267
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