Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!caip!andromeda!argus!ken
From: ken@argus.UUCP (Kenneth Ng)
Newsgroups: net.lang.c,net.unix
Subject: Re: C I/O Question
Message-ID: <423@argus.UUCP>
Date: Mon, 4-Aug-86 08:37:07 EDT
Article-I.D.: argus.423
Posted: Mon Aug  4 08:37:07 1986
Date-Received: Mon, 4-Aug-86 21:09:45 EDT
References: <1222@inuxc.UUCP> <503@hadron.UUCP>
Distribution: net
Organization: NJ Inst of Tech., Newark NJ
Lines: 40
Xref: mnetor net.lang.c:5550 net.unix:5102

In article <503@hadron.UUCP>, jsdy@hadron.UUCP (Joseph S. D. Yao) writes:
> In article <1222@inuxc.UUCP> lar@inuxc.UUCP (L Reid) writes:
> >Is there a way to input a character from stdin without requiring
> >the user to terminate it with a <CR>.
> 
> Several ways.  All involve doing an stty() or an ioctl()
> call (depending on which version of Unix you have, or which
> you feel more comfortable with -- starting from scratch, use
> ioctl() if you have it).
> The simplest and most general is to go into 'raw' mode.  If
> you are ceertain you'll never use a pre-V7 machine, 'cbreak'
> mode might be better, depending on your intentions.
> If you have System V, you can also set a minimum number of
> chars before input returns, and/or a timeout.

I've had a problem using this on an AT&T 3b5 running Syst 5R2.
It seems that if you set the min character and timeout value,
the timeout does NOT occur until the process receives at least
ONE character.  The only way I've been able to get this to work
is to save the present alarm value, set an alarm for the timeout
I wanted (10 seconds), and test to see if the alarm blasted the
read out. 

> 
> 	Joe Yao		hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}
> 			jsdy@hadron.COM (not yet domainised)

-- 
Kenneth Ng:
Post office: NJIT - CCCC, Newark New Jersey  07102
uucp(for a while) ihnp4!allegra!bellcore!argus!ken
           !psuvax1!cmcl2!ciap!andromeda!argus!ken
     ***   WARNING:  NOT ken@bellcore.uucp ***
bitnet(prefered) ken@njitcccc.bitnet or ken@orion.bitnet

Spock: "Captain, you are an excellent Starship Captain, but as
a taxi driver, you leave much to be desired."

Kirk: "What do you mean, 'if both survive' ?"
T'Pow: "This combat is to the death"