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From: ggs@ulysses.UUCP (Griff Smith)
Newsgroups: net.unix-wizards
Subject: Re: UNIX Futures
Message-ID: <1203@ulysses.UUCP>
Date: Mon, 10-Mar-86 13:03:06 EST
Article-I.D.: ulysses.1203
Posted: Mon Mar 10 13:03:06 1986
Date-Received: Wed, 12-Mar-86 01:48:25 EST
References: <67@cstvax.UUCP> <257@maynard.UUCP> <1199@ulysses.UUCP> <168@desint.UUCP> <1200@ulysses.UUCP> <1641@brl-smoke.ARPA>
Distribution: net
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 31

> In article <1200@ulysses.UUCP> ggs@ulysses.UUCP (Griff Smith) writes:
> >One comment in my defense: job control works in Eighth edition UNIX
> >(V8).  I don't know whether this is an oversight by the system impurity
> >hit squad or a conscious effort to perserve an occasionally useful
> >feature.
> 
> I am curious about how this is accomplished; I don't see any
> SIGSTOP-generating character defined in TTYLD(4) (standard
> terminal handler line discipline).  Perhaps there is an extra
> module slipped into place in your terminal stream; such a
> critter could easily catch e.g. ^Z and post a SIGSTOP.  Streams
> make it easy to add features like this; you could even have a
> "Hazeltine tilde kludge" module..

Correct.  There is a streams module that implements the BSD "new" line
discipline.  A V8 user gets access to the ^Z hook by running either csh
or ksh, just as in 4.[123]BSD.  Ksh just pops the standard line
discipline and pushes the new one.  A few of the "terminal I/O from/to
background" features behave strangely; that doesn't seem to be much of
a problem.

To be fair, I doubt that many of the "true believers" who use V8 use
job control.  Most of the ones I see have 5620 bit-mapped terminals
and use a stream-based window manager that may not have the right
hooks for ^Z.
-- 

Griff Smith	AT&T (Bell Laboratories), Murray Hill
Phone:		(201) 582-7736
Internet:	ggs@ulysses.uucp
UUCP:		ulysses!ggs  ( {allegra|ihnp4}!ulysses!ggs )