Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!rochester!cornell!uw-beaver!mit-eddie!wuarchive!usc!srhqla!demott!kdq
From: kdq@demott.COM (Kevin D. Quitt)
Newsgroups: comp.lang.c
Subject: Re: Null Pointer Assignment
Message-ID: <762@demott.COM>
Date: 12 Oct 90 16:29:11 GMT
References: <15004@mentor.cc.purdue.edu>
Reply-To: kdq@demott.COM (Kevin D. Quitt)
Distribution: usa
Organization: DeMott Electronics Co., Van Nuys CA
Lines: 30

In article <15004@mentor.cc.purdue.edu> schikore@mentor.cc.purdue.edu (Dan Schikore) writes:
>What exactly does the run-time error "Null Pointer Assignment" mean?
>
>printf("done\n");
>exit(0);
>
>at the end of my main, and when executed, it says
>
>done
>Null Pointer Assignment

    I would guess that you're using Microsoft C, which reserves a small
portion at the beginning of the data as to try to detect the use of null
pointers, and to help you avoid other side effects.  This area has a known
value (the Microsoft copyright info), and it is checked upon exit.

    If the data are not correct, you've written thru a null pointer, and
you get the above error message.

    I assume further that if you're not using Mirosoft C, your C compiler
does something similar.


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Kevin D. Quitt         demott!kdq   kdq@demott.com
DeMott Electronics Co. 14707 Keswick St.   Van Nuys, CA 91405-1266
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