Dear SCO Customer,

Support Level Supplement (SLS) ptf7424b, the libnsl Supplement, contains
modifications to address the problem where logging in over a modem using
cu(1bnu) fails for any of the reasons listed below, or where t_bind
returns the incorrect address after a successful connection is
established.

SLS ptf7424a addressed these issues:

    (1) If the user does not complete the login within 4 seconds, the
        login attempts is killed and restarted.
    (2) If the users shell is /bin/sh the shell prompt is displayed
        and then the login is killed (and the line is hung up).
    (3) ttymon with the P flag does not allow non-PPP logins to work
        correctly.
    (4) ttymon sets an alarm that is never canceled.

SLS ptf7424b additionally addresses this issue:

    (5) In rare occurrences, t_bind will succeed but return the address
        with the family incorrectly set.

A description of modifications provided with this SLS:

    (1) Added alarm cancellation calls to other function departure points.
    (2) Removed NONBLOCK flag from call to open on device.
    (3) Left the sa_family intact on return from t_bind.


SLS ptf7424b contains these files:

    /usr/lib/libnsl_i.so


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

SLS ptf7424b should only be installed on: 

    UnixWare 7.1.0

Note: SLS ptf7401 must be installed and the system rebooted before 
      installing SLS ptf7424b.


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

1. Download the ptf7424b.Z file to the /tmp directory on your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7424b.Z
        # pkgadd -d /tmp/ptf7424b
        # rm /tmp/ptf7424b

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/ptf7424/install/ptf7424.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf7424

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


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