How do I return a cursor thought the ODBC driver

I have created a function in postgres called getallusers(var) that returns a cursor. This works fine at the psql level but when I try to return it through ODBC I get a variety of errors.

The function is as follows:

CREATE OR REPLACE FUNCTION getallusers(refcursor) RETURN refcursor AS'

begin
open $1 for select * from users;
return $1;
end;
' language 'plpgsql';

I call it like this at the psql level:

begin
select getallusers('rs');
fetch all in rs;
commit;

This works fine in psql as I mentioned but not when I try to query it through ODBC.

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