TECHNICAL INFORMATION DOCUMENT

TITLE:  TF2117 - TTY Port Monitor Patch
DATE:  25AUG95
README FOR:  TF2117
PRODUCT and VERSION:

UnixWare 2.01

Installation Instructions:  

DATATYPE: datastream

1.  Download the tf2117.Z and tf2117.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, uncompress the file and add the package to your 
    system using the following commands:

        $ su
        # uncompress /tmp/tf2117.Z
        # pkgadd -d /tmp/tf2117

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

Title
-----

PTF2117 - TTY Port Monitor Patch

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

UnixWare 2.01, UnixWare 2.02

Abstract
--------

The TTY Monitor disables a serial port erronously has been fixed.

Symptom
--------

The TTY Port Monitor disables a serial port after a rapid number
of failed accesses when the port is being used by another system
functionality such as Point-to-Point Protocol (PPP).


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

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

The TTY Port Monitor now waits 60 seconds between access attempts
when the failure is an EAGAIN or EBUSY error and does NOT disable
the serial port when it happens.  When this situation occurs, the
following message is logged to /var/saf/ttymonX/log:

Errno is EAGAIN or EBUSY, will try again later <device>


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

None.

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

This PTF can be installed on UnixWare 2.01 and UnixWare 2.02.

If installed on UnixWare 2.01 and UnixWare Update 2.02 is
installed at some future date, this PTF DOES NOT need to be
re-installed after UnixWare Update 2.02.

Testing of the modified software contained in this package has been
conducted only to the extent necessary to confirm that it resolves the
problem(s) stated above ("Symptom").  Such testing consists of
recreating the problem conditions and verifying that the problem no 
longer occurs.  No other testing of this software has been done.

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

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