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From: jimp@cognos.uucp (Jim Patterson)
Newsgroups: news.software.b
Subject: Re: News for Xenix on PC AT ?
Message-ID: <655@cognos.UUCP>
Date: Tue, 5-May-87 11:49:35 EDT
Article-I.D.: cognos.655
Posted: Tue May  5 11:49:35 1987
Date-Received: Thu, 7-May-87 01:48:37 EDT
References: <18346@ucbvax.BERKELEY.EDU> <145@sds.UUCP> <17005@sun.uucp> <146@sds.UUCP> <2440@ulysses.homer.nj.att.com> <442@prairie.UUCP> <25 May 87 15:49:35 GMT
Reply-To: jimp@cognos.UUCP (Jim Patterson)
Organization: Cognos Incorporated, Ottawa, Canada
Lines: 14
Summary: NULL character pointer validity

(Sorry, I missed the original posting)

>As quoted from <442@prairie.UUCP> by dan@prairie.UUCP (Daniel M. Frank):
>| The VAX compiler and linker appear to arrange that (char *)0
>| ALWAYS points to a null string.

This can't be the VAX/VMS C compiler. On our system page 0
(addresses 0 to 511.) is always reserved, not for any special
hardware considerations but so references to a NULL pointer will
fail ungraciously.  (This is considered to be a program error that
should be corrected).  This is true of NULL character pointers as well.
-- 
Jim Patterson
Cognos Inc.