From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Signal
Date:	Sat, 04 Jan 1997 12:07:57 -0800
Organization:	Two pounds of chaos and a pinch of salt
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Message-ID:	<32CEB89D.5DC9@cs.com>
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Reply-To:	fighteer AT cs DOT com
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Andreas Vernersson wrote:
> 
> I've programmed a timer-interrupt (int 0x1c) and it works fine, but
> if i terminate my program with Ctrl-C when the timer is installed
> the computer hung. I think this is caused because i dont't reinstall
> the old interrupt and my timer-interrupt is still there when the program
> tries to exit. So, how do i change the signal caused by Ctrl-C to
> restore the real timer interrupt before exiting. Hm.. And hum..
> how do i make the usual "core dump" appear in the new signal before
> exiting?

Well, to trap Ctrl-C, just install a signal handler for SIGINT like so:

void my_handler( int sig );
{
   ...
}

signal( SIGINT, my_handler );

Your signal handler can then take care of restoring interrupts,
deallocating DOS memory, etc.  As far as getting a traceback printed,
there was a big discussion a while back about how to do it, but I don't
remember the details.  I'm sure somebody does though.  :)

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