Xref: utzoo comp.dcom.modems:1380 comp.unix.questions:5491
Path: utzoo!utgpu!water!watmath!clyde!rutgers!im4u!ut-sally!utah-cs!utah-gr!uplherc!sp7040!obie!wes
From: wes@obie.UUCP (Barnacle Wes)
Newsgroups: comp.dcom.modems,comp.unix.questions
Subject: Re: dial in / out on same line
Summary: Two devices for single modem line
Message-ID: <30@obie.UUCP>
Date: 4 Feb 88 05:35:37 GMT
References: <142@mccc.UUCP> <564@virginia.acc.virginia.edu> <10321@mimsy.UUCP> <3015@lll-winken.llnl.gov>
Organization: UinTech, Layton, UT
Lines: 21

In article <3015@lll-winken.llnl.gov>, casey@lll-crg.llnl.gov (Casey Leedom) writes:
> In article <10354@mimsy.UUCP> chris@mimsy.UUCP (Chris Torek) writes:
> > Nonetheless, I believe two devices is most appropriate.  After all,
> > the modem is, virtually speaking, two devices!
> 
>                                        ...But fundamentally you're right,
> we're talking about two different pseudo devices which are implemented on
> the same physical device.  Sorry for the stones.

Right.  As a matter of fact, MicroPort supports different 'pseudo
devices' for the tty ports in their '286 and '386 System V: /dev/tty0
also maps to /dev/ttym0 and /dev/ttyM0.  You can run a getty on M0,
and call out on m0.  If anything but getty (i.e. a login process) has
M0 open, the m0 open will fail.  When m0 is opened, the M0 process
just blocks until m0 is closed.  Clever, and works pretty well.

-- 
	{backbones}!utah-cs!utah-gr!uplherc!sp7040!obie!wes

	"Against Stupidity, The Gods Themselves Contend in Vain."
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