Table permessions

Hello,

I have create a table from another table such as

CREATE TABLE tmp_XXX AS SELECT * FROM XXX; 

The  tmp_XXX  tables has no permissions assigned to it and I  want to assign it with the same owner and access privileges  of XXX  table. I had a look on pg catalog tables  http://www.postgresql.org/docs/8.4/static/catalogs.html to create a stored procedure to do this job for me. I have found some tables which might be useful to get the original table iformation. For example, I can use  pg_table to get the owner of the original table.  Also, I have found pg_roles. However, I was not able to find where the access privileges are stored.

Is there a better way to do this task than extracting the access privileges from pg catalog ?  If not, where I can find the access privileges information ?

Thanks in advance