Dear Caldera Customer,

Support Level Supplement (SLS) ptf4026g, the SCO UnixWare libc Shared
Libraries Patch, addresses the following problems:

SLS ptf4026a addressed these issues:

1. Upon doing an asynchronous connect(3N), select(3C) would always return 
   saying the file descriptor representing the socket was writeable, whether 
   or not connection was established.

   SLS ptf4026 now only allows for a 'writeable' return when a connection
   has been established.

   Note: For a complete solution to the reported issue, it is required
   that SLS ptf4027, the SCO UnixWare Streams Driver, also be installed.

SLS ptf4026b addressed these issues:

2. A modification was made to take UW2compat 7.1.0 or 7.1.1 into  
   consideration. If UW2compat 7.1.1 is installed, then ptf4026 should
   not and will not install.

3. Package installation scripts were modified to properly deal with MAC 
   security levels.

SLS ptf4026c addressed this issue:

4. Modifications to select(3C) to only return an exception if one
   is requested.

   This problem may manifest itself by select(3C) returning "bad file
   number" after the descriptor is closed.

SLS ptf4026d addressed this issue:

5. Rare stalls in threaded programs have been eliminated.

SLS ptf4026e addressed this issue:

6. The pt.c functions have been enhanced to support up to 99999 ptys.
   Previously, the Unix98 pty support routines could not allow more than
   999 ptys to be allocated by a user process.

SLS ptf4026f and ptf4026g additionally address this issue:

7. Fixes an installation problem when UW2compat package is already 
   installed

SLS ptf4026g contains:

        /usr/lib/libc.so.1.UW711
        /usr/lib/libc.so.1.UW710
        /usr/lib/libc.so.1.UW2
        /udk/usr/ccs/lib/libc.a.UW711
        /udk/usr/ccs/lib/libc.a.UW710
        /usr/ccs/lib/libc.a.UW2


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

SLS ptf4026g should only be installed on:

       SCO UnixWare Application Server Release 2.1.3
       SCO UnixWare Personal Edition Release 2.1.3

SLS ptf4026g supersedes, and includes all fixes from, previous versions 
of SLS ptf4026.


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

1. Download the ptf4026g.Z file to the /tmp directory on your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf4026g.Z
        # pkgadd -d /tmp/ptf4026g
        # rm /tmp/ptf4026g

3. There is no need to reboot the system after installing this SLS
   package.

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

        /var/sadm/pkg/ptf4026/install/ptf4026.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf4026

2. There is no need to reboot the system after removing this SLS
   package.

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