TECHNICAL INFORMATION DOCUMENT

TITLE:  TF2018 - SPECFS PATCH
DATE:  01SEP95
README FOR:  TF2018
PRODUCT and VERSION:

UnixWare 2.01

Installation Instructions:  

DATATYPE: datastream

1.  Download the tf2018 and tf2018.txt files to the /tmp directory
    on your machine.

2.  Read the release notes contained in  this file and follow the 
    instuctions to add the package to your system.

3.  Now become root, and add the package to your system using the following 
    commands:

        $ su
        # pkgadd -d /tmp/tf2018

ENGINEERING REALEASE NOTES
--------------------------

PTF2018 OVERVIEW
---------------

Title
-----

PTF2018 - SPECFS PATCH

Version
-------
1.0

Date
----

6APR95

Information Type
----------------

Symptom Solution

Product And Version
-------------------

UnixWare 2.0 or 2.01

Abstract
--------

This PTF consists of a fix to prevent a deadlock condition caused
by the lack of carriage return from the first ttymon.

Symptom
--------

Without this fix, users might get into a deadlock when the first ttymon
doesn't have a carriage return.


SOLUTION SPECIFICS
------------------

General Description.
-------------------

This ptf fixes a hang-up problem in specopen()/specclose() in
specfs module.  spec_open()/spec_close() uses a rwsleep lock with
the exclusive mode to protect the count of special node and this causes
dead lock situations when a line didn't receive a carriage return.
The solution is to replace the rwsleep with a spin lock to
avoid dead lock situations.

New Features.
------------

None

Software Notes and Recommendations.
----------------------------------

This PTF should be applied on systems running UnixWare 2.0 or 2.0.1.
If you choose to remove (un-install) the PTF and restore your system to
its original condition, please enter the following command:

	#pkgrm ptf2018

Hardware Notes and Recommendations.
----------------------------------

This PTF is targeted for the i386, i486 and Pentium CPU's.

Installation Instructions.
-------------------------

This PTF consists of 1 3.5 inch floppy.  Insert the floppy into the drive
and, while logged in as root, type

	pkgadd -d diskette1

and follow the instructions output by pkgadd.

Troubleshooting.
---------------

None