socket, UDP, SO_MAX_MSG_SIZE ???

[Courageous]

I'm implementing an application layer on top of UDP using the
socket module, and I'm trying to determine the local machine's
SO_MAX_MSG_SIZE. This option doesn't appear to be
available in the socket module.

I don't really know much about maximum UDP packet sizes.
Do they generally default to the IP 65K limit? And if not, what's
an alternate route for determining the max msg size?

C//