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From: elvis@hammond.cs.unlv.edu (Frederick Haab)
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.programmer
Subject: Re: How to implement an I/O Timeout
Message-ID: <1991May21.204255.21788@unlv.edu>
Date: 21 May 91 20:42:55 GMT
References: <1991May21.164600.10474@spool.cs.wisc.edu>
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Reply-To: elvis@jimi.cs.unlv.edu (Frederick Haab)
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In article <1991May21.164600.10474@spool.cs.wisc.edu> ttl@aura.cs.wisc.edu (Tony Laundrie) writes:
>I am doing some low-level I/O, and if the cables aren't all connected,
>then an inp() statement will hang forever.  How do I set up a timeout in
>Turbo C or Microsoft C?
>
>I want to say something like:
>
>		settimeout (2, timeout_error);	/* in two seconds,
>						    call timeout_error() */
>		x = inp ();			/* attempt input */
>		settimeout (0);			/* cancel the timeout, 'cuz
>						    we succeeded */
>
>Thanks.      Please email--I will post summary.   ttl@cs.wisc.edu

I posted a small C program a few weeks ago that played music in the
background.  I'm sure you could use the same method to set a timed
delay and then call a subroutine that would just terminate (do
an exit(0) or something), but I don't know how you would just
get your inp() function to stop.  You could try putting a label
after your inp() and then maybe *fix* the stack somehow so that it
would seem the inp() function was never called.

Just a thought...

		--==-- Frederick Haab --==--