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From: manly@UMass.BITNET
Newsgroups: mod.computers.vax
Subject: A QUESTION REGARDING THE ACP-QIO INTERFACE ROUTINES
Message-ID: <8610291043.AA12039@ucbvax.berkeley.edu>
Date: Mon, 27-Oct-86 15:22:00 EST
Article-I.D.: ucbvax.8610291043.AA12039
Posted: Mon Oct 27 15:22:00 1986
Date-Received: Wed, 29-Oct-86 21:48:49 EST
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Hi out there in INFO-VAX land.  I have a question regarding the file system
and doing $QIO's to the disk ACP.  I am writing a utility to convert an
arbitrary file into an ordinary sequential file of fixed length 512 byte
records in such a way that it can be completely reconstructed (including
things like the First Free byte and End of file block along with all the
record information and file characteristics bits).  I will be using this
to do things like store indexed files on tape without having to use the
backup utility.

To do this, I am making use of the ACP-QIO interface stuff from the IO user's
guide, and using FIBs and Attribute blocks (ATR$).  Now the question:
there are a number of Attributes defined but not explained very well.
In particular, do any of you file system hackers know what the following
Attributes are or do? (IO Users Guide, page 1-19)

    ATR$C_SEMASK,  ATR$C_ DIRSEQ,  and ATR$C_USERLABEL

I am particularly interested in the latter two (the first I assume is support
for the as-yet unimplemented class based security system for Verson 5).
I have tried writing and reading the USERLABEL field, and it completes
sucessfully.  But it always comes back empty, and what I write into it doesn't
get put anywhere.  Is this field only for tapes or something.  And what is
a Directory Sequence Update count?

                                 Thanks in advance for any info,

BITNET:  JWMANLY@AMHERST              John W. Manly
                                      System Manager
                                      Amherst College ACC
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