Dear SCO Customer,

Support Level Supplement (SLS) PTF7033B, the UnixWare7 Loopback Driver Patch,
corrects a problem whereby if a Unix domain socket has untransmitted data,
and the socket is closed, then the data may be lost.  SLS PTF7033B prevents
possible data loss by blocking the socket closure until all the data has
been transmitted.

SLS PTF7003B contains the following files:

        /etc/conf/pack.d/ticots/Driver_atup.o
        /etc/conf/pack.d/ticots/Driver_mp.o
        /etc/conf/pack.d/ticotsor/Driver_atup.o
        /etc/conf/pack.d/ticotsor/Driver_mp.o


The release notes, displayed prior to installation, can be found in:

        /var/sadm/pkg/ptf7033/install/ptf7033.txt


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

SLS PTF7033B should only be installed on:

         UnixWare 7 with the UnixWare 7 Release Supplement (uw7rs) applied
         UnixWare 7.0.1


Testing of the modified software contained in this SLS has been
conducted only to the extent necessary to confirm that it resolves
the problem stated above.  Such testing consists of re-creating
the problem conditions (typically in an SCO test laboratory) and
verifying that the problem no longer occurs.  No other testing of
this software has been done.


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

This SLS is intended for i486, Pentium, Pentium Pro, Pentium II,
and compatible CPUs.



Installation Instructions
-------------------------

1. Download the ptf7033b.Z and ptf7033b.txt file to the /tmp directory on
   your machine.

2. As root, uncompress the file and add the SLS to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7033b.Z
        # pkgadd -d /tmp/ptf7033b
        # rm /tmp/ptf7033b

3. Reboot the system after installing this SLS.


Note: A system reboot is required following installation of this SLS
for the kernel sections to take effect. However, if you have not
already installed any other SLS that you need, you should do so 
before rebooting.

Removal Instructions
--------------------

1. As root, remove the SLS using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf7033

2. Reboot the system after removing this SLS.


If you have questions regarding this SLS, or the product on
which it is installed, please contact your software supplier.

We appreciate your business.

SCO Support Services