SSL mode detection

Hi folks,

I'm using PG 8.4.10 on Ubuntu Server 10.04.3.LTS x86_64.

Is there any way to query the SSL mode for client connections?

E.g.  select backend_id from some_table_or_view where ssl_mode = false;

I have not been able to find it in pg_stat_activity or anywhere else in
the catalog.  Maybe I'm just blind. :-(

TIA.

Bosco.