Path: utzoo!utgpu!watmath!clyde!att!osu-cis!killer!ames!amdcad!sun!pitstop!sundc!seismo!uunet!nuchat!orion@nuchat
From: orion@nuchat (Roland Dunkerley)
Newsgroups: comp.unix.wizards
Subject: Re: printf, data presentation
Message-ID: <2805@nuchat.UUCP>
Date: 9 Jan 89 08:38:58 GMT
References: <19@xenlink.UUCP> <8800006@gistdev>
Sender: orion@nuchat.UUCP
Reply-To: orion@nuchat (Roland Dunkerley)
Organization: South Coast Computing Services, Houston, Tx.
Lines: 50
In-reply-to: flint@gistdev.UUCP

In article <8800006@gistdev>, flint@gistdev writes:
>
>I've found ioctl to be about the least portable thing in UNIX.  (FIONREAD
>isn't in the SVID, or at least I couldn't find it in TERMIO(BA_ENV) or
>IOCTL(BA_OS), so if it is in SVID & I missed it, I'd appreciate being
>enlightened.) 
This is true, System V R3 provides (non-portable) functional
equivalants to FIONREAD and the select() call but, it only works on
streams devices...  Maybe R4 will get it right?
>
>  .....  (For example, if I want my user
>to type as many keys as they want to within 10 seconds, and then evaluate
>that amount of input, I'm stuck: I have to change the timelimit with each
>successive keypress to be "10 - time_used_so_far", and the only way to do
>so is with an incredibly slow ioctl() call on each keypress.  Some Guru
>out there might know some neat way to do this I haven't heard about:
>if you know how to do it in Sys V without having to go way out of your
>way with something like writing your own device driver, I'd like to hear
>your solution.)
how about the following:

catch()
{
	signal ( SIGINT, catch );
	signal ( SIGQUIT, catch );
	signal ( SIGALRM, catch );
	alarm(0);
}
/* ...... */
        catch();

	alarm(10);
	if( count=read(0, &buffer, buffer_size)==-1 )
	{
	    alarm(0);
	    /* Handle failure */
	}
        
I think this is portable and should achieve the desired result.  We
use this in the autobaud section of our local getty.
>
>Flint Pellett, Global Information Systems Technology, Inc.
>1800 Woodfield Drive, Savoy, IL  61874     (217) 352-1165
>INTERNET: flint%gistdev@uxc.cso.uiuc.edu
>UUCP:     {uunet,pur-ee,convex}!uiucuxc!gistdev!flint
Roland Dunkerley III
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