create a limited user in Postgre - Mailing list pgsql-general

Hi, i have a question:

I have a database and i want to create a administrator user with total
control and another that only could make queries and could not see nor
modify the functions.

The reason is that in the database that i will distribute are the
functions with a big part of the software logics and i do not want
these to be seen by my customers.

Thanks in advance, Guillermo