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From: | "Michael Beck" <beck AT dresearch DOT de> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: HELP! SIGSEGV Page Fault |
Date: | Mon, 28 Dec 1998 10:54:34 +0100 |
Organization: | DResearch |
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Message-ID: | <767ke6$e4l$1@latinum.dresearch.de> |
References: | <7677mg$ri0$1 AT nnrp1 DOT dejanews DOT com> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
leonj AT geocities DOT com wrote in message <7677mg$ri0$1 AT nnrp1 DOT dejanews DOT com>... >Im having a problem that's ticking me off. >I picked up a tutorial for Allegro from: [...] > >Shutting down Allegro >Exiting due to signal SIGSEGV >Page fault at eip=00012996, error=0004 >eax=00000000 ebx=00000000 ecx=00000100 edx=000003c9 esi=0f580000 edi=00042270 Looks like a NULL pointer access. Look at the eax, ebx registers. > >set_pallette((RGB*)data[TUT_GAMEPAL].dat); > add a check for NULL pointer before calling set_palette, for instance: #inlcude <assert.h> ... assert(((RGB*)data[TUT_GAMEPAL].dat != NULL); set_pallette((RGB*)data[TUT_GAMEPAL].dat); Now, if your program stops with an 'assertion failed' message, check while this is NULL. Hope that helps, -- Michael Beck, email: beck AT dresearch DOT de
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