From:	David Eberhard <toothpck AT xmission DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	problem with memory allocation (I think)
Date:	Thu, 08 Jan 1998 00:19:22 -0700
Organization:	XMission Internet (801 539 0900)
Lines:	34
Message-ID:	<34B47DFA.E0D6D796@xmission.com>
NNTP-Posting-Host:	slc129.modem.xmission.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I am getting a runtime error when running my program.  Here is the
part that is not running correctly:

   long i;
   unsigned int *buffer;
   buffer = malloc(640 * 480 * 2);
   for(i = 0; i < 640*480; i++)
      {
      buffer[i] = i;
      }


and here's the error message I get:

Exiting due to signal SIGSEGV
General Protection Fault at eip=0000194a
eax=001c0000 ebx=00021fff ecx=00006ccc edx=0000006c esi=00021ffe
edi=00000005 ebp=0004efe0 esp=0004eebc
program=c:/cplus/djgpp/graphics.exe

cs: sel=1b9f  base=835be000  limit=001bffff
ds: sel=1ba7  base=835be000  limit=001bffff
es: sel=1ba7  base=835be000  limit=001bffff
fs: sel=1b3f  base=00017bb0  limit=0000ffff
gs: sel=1bb7  base=00000000  limit=ffffffff
ss: sel=1ba7  base=835be000  limit=001bffff

Call frame traceback
EIPs:                                                0x0000194a
  0x00001f96


If I change the for loop so that it only loops 640*480/2 times, then
it works fine.  Can anyone tell me what's going on?

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