From:	"John Spence" <jspence AT lynx DOT net DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	tracking down runtime error
Date:	Wed, 19 Aug 1998 03:08:02 +0930
Organization:	Telstra Internet Browse Server
Lines:	46
Message-ID:	<35dab9f3.3381119@l>
NNTP-Posting-Host:	203.33.18.66
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Using the following code to display the contents of a linked list with
DJGPP  (gcc2721b)

void traverse(NODEPTR start)
{
  while(start)
  {
    printf("%d\n", start->number);
    start = start->next;
  }
}

I get the error which follows during runtime.  I can run this program
without a problem under Linux with gcc and DOS with Turbo C so I am
99% confident that this is not a problem with my code.

Cany anyone help me pinpoint the cause of this error with DJGPP/gcc
(dos) or refer me to a doc that will.


The values that should have been displayed are 5, 4, 3, 700, 900, 100

====== start of program output ==================
5
4
3
700
134744064
Exiting due to signal SIGSEGV
General Protection Fault at eip=000016ab
eax=08080808 ebx=0004f120 ecx=00000000 edx=08080808 esi=00000054
edi=0000dac0
ebp=0004da7c esp=0004da7c program=D:\UNITEMP\C\PRAC3A.EXE
cs: sel=00af  base=82cc9000  limit=0006ffff
ds: sel=00b7  base=82cc9000  limit=0006ffff
es: sel=00b7  base=82cc9000  limit=0006ffff
fs: sel=0087  base=0000af90  limit=0000ffff
gs: sel=00c7  base=00000000  limit=ffffffff
ss: sel=00b7  base=82cc9000  limit=0006ffff

Call frame traceback EIPs:
  0x000016ab
  0x00001619
  0x00001c5e

- Raw text -