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From: krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz)
Newsgroups: comp.sys.apollo
Subject: Re:  ms_$mapl and fseek/fread
Message-ID: <8910241542.AA02474@richter.mit.edu>
Date: 24 Oct 89 15:42:57 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 19

The MS calls will create a file with a type-UID of "NIL". 
The Unix system I/O calls all use the stream I/O system,
ie. files with types of UASC, UNSTRUCT, REC, etc. They can't
read a NIL file because they don't know how to extract the
data from the file (does the file have a header? does it have
a record structure? etc.). What you probably want to do is to
use either IOS_$CREATE or one of the Unix calls to create an
UNSTRUCT file, (which is a stream I/O system file which has
neither a header nor a record structure embedded in the file)
close the file, and then re-open it with MS_$MAPL or with
the Unix mapped-segment calls.


 -- David Krowitz

krowitz@richter.mit.edu   (18.83.0.109)
krowitz%richter.mit.edu@eddie.mit.edu
krowitz%richter.mit.edu@mitvma.bitnet
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