Kerberos login code example

[Jakob Erber]

Hello,

hard to believe, but I seem not to be able to find the following in
the web:

The Kerberos (not gss-api) code, which a server application would use
to login to kerberos via keytab file and to refresh the obtained
credentials periodicaly so that it can run 24*7.

The application should not rely on existing credentials in the
environment.

Can somebody point me to a code sample, which does this job? The code
without credential refresh would also be welcome.

best regards

Jakob