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From: ttl@aura.cs.wisc.edu (Tony Laundrie)
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.programmer
Subject: How to implement an I/O Timeout
Message-ID: <1991May21.164600.10474@spool.cs.wisc.edu>
Date: 21 May 91 16:46:00 GMT
Sender: news@spool.cs.wisc.edu (The News)
Distribution: usa
Organization: U of Wisconsin CS Dept
Lines: 13

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