Date: Tue, 31 Aug 1999 09:28:30 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Dave Bird <dave AT xemu DOT demon DOT co DOT uk>
cc: djgpp AT delorie DOT com
Subject: Re: Error General Fault Protection on quit???
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On Mon, 30 Aug 1999, Dave Bird wrote:

> >   void validate_or_die (void *ptr)
> >   {
> >     if ( (unsigned)p < 0x1000)
> >       abort ();
> >   }
> 
>  Sounds possible... I'd prefer to log or report rather than abort,

That's up to you, but `abort' has an advantage of producing a
traceback, which shows you the entire sequence of function calls that
led to the problem; whereas in a log message it is not trivial to
print enough information to let you know who's the villain.

Anyway, why let a program that dereferences NULL run? ;-)

>  and is there an upper limit??

The upper limit is the data segment limit.  But you don't have to
check that, since any protected-mode environment, including Windows,
catches those cases and crashes your program with a GPF.