Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!alberta!calgary!gass!afg
From: afg@gass.UUCP
Newsgroups: comp.lang.c
Subject: Re: Query: Implementation with non-zero NULL
Message-ID: <186@gass.UUCP>
Date: Sat, 30-May-87 18:57:11 EDT
Article-I.D.: gass.186
Posted: Sat May 30 18:57:11 1987
Date-Received: Thu, 4-Jun-87 01:44:40 EDT
References: <158@delftcc.UUCP> <20028@sun.uucp>
Organization: Ginter & Associates, Calgary AB
Lines: 10
Keywords: C, NULL, portability
Summary: Multics C has non-zero NULL

I believe that the recently released Honeywell Multics C compiler 
implements NULL pointers with a non-zero value.  This is because there
is a reserved pointer value in the Multics architecture which the
hardware will generate a special "null pointer fault" for, when someone
tries to go indirect through it.

Send me mail if you want more information.

Andrew Ginter, Ginter and Associates, 208 - 21 Avenue NW, Calgary, Alberta
(403) 230-3012            ...!{ubc-vision, ihnp4}!alberta!calgary!gass!afg