From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: unload_datafile( ) freezes - please help :(
Date: Thu, 17 Feb 2000 10:26:52 +0200
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On Wed, 16 Feb 2000, Damian Yerrick wrote:

> On Wed, 16 Feb 2000 13:12:10 +0200 (IST), Eli Zaretskii
> <eliz AT is DOT elta DOT co DOT il> wrote:
> 
> >On Wed, 16 Feb 2000 Riddler02 AT aol DOT com wrote:
> >     
> >>     Shutting down Allegro
> >>     Exiting due to signal SIGINT
> >>     INTR key Pressed at eib=000339d7
> >> 
> >> which is not too much help at all.
> >
> >Try pressing Ctrl-BREAK instead, and it should produce a regsiter dump 
> >and a stack traceback.  Post that message here, and somebody might be 
> >able to glean something useful from that.
> 
> Allegro catches Ctrl+Break in its keyboard handler.

Does it gobble Ctrl-BREAK without a trace?  It obviously doesn't do
that with Ctrl-C (see above).  If Ctrl-BREAK gets the same treatment
as Ctrl-C does, you will see the full traceback instead of just "INTR
key Pressed at eip=".

If Allegro does cause Ctrl-BREAK disappear without a trace, I'd say
that's a misfeature: the fact that Ctrl-BREAK generates a full
traceback is a valuable feature, designed just for such cases where a
program gets stuck in an endless loop.  Losing it is IMHO a Bad Idea:
it makes debugging harder.

(FWIW, generation of SIGINT given Ctrl-C or Ctrl-BREAK is done by the
keyboard handler installed by the stock DJGPP startup code.  So a
keyboard handler doesn't necessarily contradict proper treatment of
Ctrl-BREAK.)