Subject: Re: autoconfiguration question
To: Bill Studenmund <email@example.com>
From: Jason Thorpe <firstname.lastname@example.org>
Date: 05/21/1997 23:03:16
On Tue, 20 May 1997 13:40:26 -0700 (PDT)
email@example.com (Bill Studenmund) wrote:
> You might be right, but I'd like to try to find something different.
> Hacking an hdlc mode into the zstty code just looks gross, though
> attaching a zshdlc to the zstty might work.
...err, why? If you just handle HDLC in zstty, then you can use
any line discipline ith it, yes? Then localtalk is a line discipline
> Another things is that we run into a possable can of worms if HDLC
> support is a "mode" of the async driver. I think at open you need to
> indicate which way you want the hardware to behave. Thus avoiding
> problems like having a program talking to a modem, and then having
> another process start up and try to put the port in hdlc mode.
> So different device numbers and thus different open routines provide
...we don't special case for "dialer lines", so why for HDLC? If processes
want to avoid collision like that, they should be using TIOCEXCL.
Jason R. Thorpe firstname.lastname@example.org
NASA Ames Research Center Home: 408.866.1912
NAS: M/S 258-6 Work: 415.604.0935
Moffett Field, CA 94035 Pager: 415.428.6939