Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!blake!blake.acs.washington.edu!pjt
From: pjt@yang.cpac.washington.edu (Larry Setlow)
Newsgroups: comp.sys.apollo
Subject: RWMT with Blocks>16K or Opening a Stream to a nil file
Keywords: AEGIS.  Foo.
Message-ID: <PJT.89Jun20121048@yang.cpac.washington.edu>
Date: 20 Jun 89 19:10:48 GMT
Sender: news@blake.acs.washington.edu
Distribution: comp
Organization: Center for Process Analytical Chemistry, U of Wash, Seattle
Lines: 21

I have an unlabelled EBCDIC (bleagh) magtape containing one file with
blocks of length 17700.  RWMT barfs due to the >16K block size, but
that's okay, we can use cptape (unsupported) to get the data from the
tape onto a disk.  But alas!  The file on the disk is type nil and
refuses to be opened from C with open(fn,O_RDONLY), even though The
Manual says it should only care if I want to write to it.

So:  Anybody know how to 
1) get around the 16K block problem with rwmt?
2) change the type of a nil file (ld -a shows "file nil" as the first
two fields)?
3) open a stream to read a file of type nil?

As you may have gathered, we have no DOMAIN/IX, and are at SR9.7.

Any help will earn my Eternal Gratitude (patent pending), and a warm
feeling (unless I'm just being stupid, in which case, you will earn a
smugly superior feeling).  E-mail, please -- don't wake the neighbors.

Larry Setlow
pjt@yin.cpac.washington.edu