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From: root@bu-cs.UUCP (Barry Shein)
Newsgroups: net.micro.att
Subject: Re: ATT 3b2 (SVR2) questions
Message-ID: <513@bu-cs.UUCP>
Date: Sun, 21-Jul-85 13:07:54 EDT
Article-I.D.: bu-cs.513
Posted: Sun Jul 21 13:07:54 1985
Date-Received: Tue, 23-Jul-85 04:49:21 EDT
References: <746@wlcrjs.UUCP>, <373@cuae2.UUCP>
Organization: Boston Univ Comp. Sci.
Lines: 41

>From: heiby@cuae2.UUCP (Ron Heiby)
>Subject: Re: ATT 3b2 (SVR2) questions
>
>What you basically want to do is turn off ICANON and set VMIN and VTIME as
>your application requires.  CBREAK is, I believe, MIN=1, TIME=0.  "The MIN
					^^^^^^^^^^^^^^^^^^^^^^^^
>and TIME values are stored in the position for the EOF and EOL characters,
>respectively.  The time value represents tenths of seconds."

[FLAME ON]

Yeah Ron, I agree wholeheartedly, to quote in full from TERMIO(7):

"A read will not be satisfied until at least MIN characters have been
received or the timeout value has expired...The MIN and TIME values are
in the position for the EOF and EOL characters respectively. The time value
represents tenths of seconds."

Not too clear is it: Does a zero value in TIME produce non-blocking I/O
(timeouts occur immediately?) or should that be -1?  or does that end up
to be 255 on most machines and then the read times out in 25.5 seconds?

Maybe I'll go read the source, but not having a uniform 'no-op' value is
a bug in c_cc[].

And I won't even mention how bad an idea it was to put termio into the
administrator's manual (hasn't anyone at ATTIS heard of students?)  or
the fact that those #defines are actually VMIN and VTIME not MIN and
TIME (and VEOF, VEOL, you mention this but the man page doesn't)
....oops, guess I just did.

I'm not surprised people are confused about this very important section,
if they can find it at all.

[FLAME OFF]

	-Barry Shein, Boston University

P.S. I am not flaming at Ron, he gave a fine answer under the
circumstances, maybe someone who can get this all fixed will do
something about it.