Article View: comp.sys.ibm.pc.programmer
Article #976Re: NULL pointer error
From: Stephen Clamage
Date: Sun, 15 Jul 1990 17:20
Date: Sun, 15 Jul 1990 17:20
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weisen@eniac.seas.upenn.edu (Neil Weisenfeld) writes: >If the program is attempting to write to a NULL pointer, you could >try watching address 0x0000:0x0000 as this is where the "NULL" pointer >points. Sadly, it's not this simple. The NULL pointer error is reported for a range about about 128 bytes starting at data address zero. In a small data model program, this is not 0x0000:0x0000, but addresses DS:0x0000 - DS:0x007F. I don't believe this error can be reliably reported for other-model programs, since there is no place to put the checksummed data for comparison at program exit. -- Steve Clamage, TauMetric Corp, steve@taumet.com
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!taumet!steve From: steve@taumet.com (Stephen Clamage) Newsgroups: comp.sys.ibm.pc.programmer Subject: Re: NULL pointer error Keywords: Null dos error Message-ID: <319@taumet.com> Date: 15 Jul 90 17:20:25 GMT References: <2008@bnlux0.bnl.gov> <27092@netnews.upenn.edu> Organization: Taumetric Corporation, San Diego Lines: 14