Dynamic views/permissions

I'm trying to permit users access to their own records in a database.
A sample would be:

create table logins
(
login char(8),
name char(32),
primary key (login)
);

When a login is added an SQL user is created simultaneously. Now I
want the user to be able to view her own data:

create function userid() returns text as 'select current_user::text;'
language sql;

create view loginview as select * from logins where logins.login=userid();

grant select on loginview to public;
[OR grant select on loginview to <userid>...]

However, a select * from loginview; doesn't return any rows. Is what
I'm trying not possible at all, or am I just trying to implement it
wrong?

Regards,

-- Raju
--
Raj Mathur raju(at)kandalaya(dot)org http://kandalaya.org/
GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F
It is the mind that moves