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From: dan@rose3.UUCP (Dan Messinger)
Newsgroups: net.lang.c,net.unix
Subject: Re: C I/O Question
Message-ID: <189@rose3.UUCP>
Date: Thu, 7-Aug-86 13:50:26 EDT
Article-I.D.: rose3.189
Posted: Thu Aug  7 13:50:26 1986
Date-Received: Sat, 9-Aug-86 05:51:25 EDT
References: <1222@inuxc.UUCP> <503@hadron.UUCP> <423@argus.UUCP>
Reply-To: dan@rose3.UUCP (Dan Messinger)
Distribution: net
Organization: Rosemount Inc., Minneapolis, MN
Lines: 19
Xref: watmath net.lang.c:10190 net.unix:8839

In article <423@argus.UUCP> ken@argus.UUCP (Kenneth Ng) writes:
>> 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.

If you want to check to see if there is any input pending WITHOUT
waiting at all, then you should set min to 0.  If you are setting
min to zero, then your system is busted.

Also, something not mentioned in all manuals is that the timeout
should not be set to 1.  Use 0 for no timeout, or a value of 2
or greater.  Setting a timeout of 1 is similiar to doing a sleep(1).

Dan Messinger
ihnp4!rosevax!rose3!dan