Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
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Path: utzoo!linus!security!genrad!john
From: john@genrad.UUCP (John Nelson)
Newsgroups: net.lang.c
Subject: Re: 1-char input in C
Message-ID: <3755@genrad.UUCP>
Date: Thu, 22-Dec-83 16:55:41 EST
Article-I.D.: genrad.3755
Posted: Thu Dec 22 16:55:41 1983
Date-Received: Fri, 23-Dec-83 01:06:41 EST
References: <463@ihuxn.UUCP>
Organization: GenRad, Bolton, Mass.
Lines: 15

Your problem is a common one.  The problem is that UNIX is buffering up
the data, as opposed to the C library routines.  The most portable solution
(and easiest to understand) is to use the system() call to change the
tty mode as follows:

#include <stdio.h>
main() {
    system("stty raw");		/* dont buffer data */
    getchar();
    system("stty -raw");	/* restore normal buffering */
}

The other option is to use ioctl() (or gtty & stty on systems that have it)
to set the tty modes properly.  The problem with this is that BELL, BSD and
V7 systems are all different in the exact format of these ioctl()'s