[DUG] Licencing schemes

[Paul Heinz]

Todd asked:

> Okay. So how do you do it in Unix?

Essentially, the same way but record locking support and APIs vary across
different Unixen, different versions, and different file systems (NFS often
being an issue).

Also, it may be either daemon-based which only supports advisory locking
where you can read and write under locks or kernel-based which also allows
mandatory locking where locks do block writes and/or reads.

http://en.wikipedia.org/wiki/File_locking has a pretty good summary.

TTFN,
  Paul.