From:	"Campbell, Rolf [SKY:1U32:EXCH]" <cp1v45 AT americasm01 DOT nt DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: (KII) - Program works under windows95 but not under dos?
Date:	Thu, 19 Aug 1999 11:15:44 -0400
Organization:	Nortel Networks
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References:	<19990819094511 DOT 24744 DOT 00000851 AT ng-cj1 DOT aol DOT com>
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Keith Weatherby II wrote:

> Okay i'm working on a game with Allegro, and it works fine under a windows 95
> dos box, however whenever i go into dos mode (and try to run cwsdpmi.exe), when
> I run my program it exits giving me a SIGSEGV, I ran symify, and below is the
> results.  Can anyone tell me what this stuff means?  I will post the source
> code to my program later if someone needs to look at it to help.  I'm not doing
> anything out of the ordinary for djgpp or allegro, so i couldn't understand
> what could be wrong.
> Also I noticed similar problems happening with the last couple of allegro
> examples programs too.  They will basically work under a win95 dos box but not
> under dos mode itself.  Note i'm running allegro version 3.11 (and i've just
> reinstalled it)  So does anyone have any ideas?
> Thanks -Keith W. II

    I can only think of 2 common problems that would exibit this crash:

1) Your program accesses a NULL pointer.  This is allowed (stupily) under Win95,
but not allowed under cwsdpmi.  And it looks like it happens in your load_pcx
function.  Triple check your code for uninitialized pointers or failed malloc's,
especially in that function.

2) Your win95 video drivers run in a more stable way than the real card.  This is
unlikely, because usually it is the other way around, but the manufacturer of your
card may have noticed a bug in the hardware and fixed it with the Win95 drivers.
I really doubt this is your problem, but it is possible..

--
     -Rolf Campbell (39)3-6318

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