peter Willis <peterw(at)borstad(dot)com> writes:
> I have a trigger function written in C.
> ...
> Since the trigger is called after each row update the actual row data
> should be available in some way to the trigger.
Sure: tg_trigtuple or tg_newtuple depending on which state you want.
See
http://www.postgresql.org/docs/8.0/static/trigger-interface.html
regards, tom lane