From:	Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Page fault Segmentation fault
Date:	10 Nov 2000 00:42:40 -0800
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"Jean-Pierre GHYS" <ghys AT terre DOT inrets DOT fr> writes:

> i use DJGPP under DOS 6.0 with 16 Mo of memory and vhen i use somme POINTER
> to passe data to other foction the programme will Crasch
> with this message
> 
> Exiting due to SIGSEGV segmentation fault
> page fault at EIP =000192e,error 0006
> 
> and many other information on Registers
> 
> and the message show me the line of the programe
> 
> int fonction(int *alim,.......)
> {
> 
> ----- >>> *alim = valeur .....;
> }
> 
> PSE help
> 
> if i use the same programe under WIN95  it works !!!!

It's very likely that `alim' is NULL.  It is an error to dereference a
NULL pointer; however, Windows doesn't provide the necessary
functionality to detect it.  (Your value got written into some strange
place in memory, and you're just lucky it didn't hit anything vital.)
When using DOS with CWSDPMI, however, it does.  This is a Good Thing
since it lets you find your bugs earlier and more easily.

Get one of DJGPP's debuggers and start hunting for the reason why your
pointer is NULL.  The FAQ has more info.

-- 

Nate Eldredge
neldredge AT hmc DOT edu

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