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From: KEN%NJITCCCC.BITNET@wiscvm.wisc.edu (Kenneth Ng)
Newsgroups: net.unix-wizards
Subject: Checking for waiting characters
Message-ID: <470@brl-smoke.ARPA>
Date: Thu, 1-May-86 11:34:19 EDT
Article-I.D.: brl-smok.470
Posted: Thu May  1 11:34:19 1986
Date-Received: Sun, 4-May-86 06:41:16 EDT
Sender: news@brl-smoke.ARPA
Lines: 8

On Unix System V version 2 on an AT&T 3b5, has anyone been able to
successfully test if characters are pending?  I've got an application
that needs to time out after a certain amount of time if no characters
come through.  Every read I've done seems to wait for characters.
To date, I've tried setting -icanon on standard in, I've set the EOL
value to 50, which according to the documentation should give me a time
out of 5 seconds, and I've set the O_NDELAY on a fcntl() to standard
input.  Any help or suggestions would be greatly appreciated.