how to check uniqueness of uidNumber ?

[WONG_Jeffrey@seac.pf]

Hi,

I'm thinking about to use openldap for users authentication. For that, I use person, posixAccount and shadowAccount objects to store user data (password, uid, ...). Now I want that no user have the same uidNumber (I know Unix allows multiple users to have the same uidNumber, but this is not compliant with my policy).

So how can I check uniqueness of uidNumber ?

Jeffrey