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From: guy@sun.UUCP
Newsgroups: comp.unix.xenix,comp.sources.wanted,comp.unix.questions
Subject: Re: tty watcher
Message-ID: <27816@sun.uucp>
Date: Sat, 12-Sep-87 01:52:41 EDT
Article-I.D.: sun.27816
Posted: Sat Sep 12 01:52:41 1987
Date-Received: Sun, 13-Sep-87 08:15:54 EDT
References: <4263@ozdaltx.UUCP> <15136@hi.UUCP> <1178@mtune.ATT.COM>
Organization: Sun Microsystems, Inc. - Mtn View, CA
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Xref: utgpu comp.unix.xenix:634 comp.sources.wanted:1921 comp.unix.questions:3617

> :A while back I'd asked if anyone has an effective tty
> :watcher or "spy" program, or if they had suggestion as to
> :how such a thing could be accomplished.
> 
> This sounds lie a 3-line stream module to me. What's the problem?

1) Few, if any, kernels currently have streams-based tty drivers; S5R3 and
S5R3.1's standard tty drivers aren't streams-based.

2) Streams modules live in the kernel, and not everybody can stuff an
arbitrary streams module into their kernel.  The tty watcher in question
requires *some* kernel hacking (unless the vendor of your system has already
done that hacking) even with a streams tty.

3) There is no such thing as a non-trivial 3-line streams module. :-)

2) is the major point here; there are no tty watchers that consist solely of a
user-mode program that drops on top of a non-hacked UNIX system.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com (or guy@sun.arpa)