Getting process id of a connection?

Hi all,

Is there a way to determine the pid of a database connection from
within that connection?

As a hypothetical example, I would like to be able to do the following:

$ps x
  PID TTY      STAT   TIME COMMAND
11674 ?        S      0:00 sshd: webbs@pts/1
11675 pts/1    Ss     0:00 -bash
11682 pts/1    T      0:00 psql
11685 pts/1    R+     0:00 ps x

psql=# select CURRENT_PID;
11682

I want this so that I can log the psycopg2 connection pid, and kill it
to test reconnection code.

Thanks!
-W