objective c - IP Don't fragment bit on Mac OS

Question

I am writing a file transferring program over TCP.

I want to set the don't fragment flag on IP

On a socket this is what I want to do:

int val = 1;
setsockopt(sd, IPPROTO_IP, IP_DONTFRAG, &val, sizeof(val));

However IP_DONTFRAG does not seem available on Mac OS. Am I missing something? or did I forget to include it correctly?

Thanks in advance if anyone knows

--Sam

Answer 1

google brought up this: http://lists.apple.com/archives/macnetworkprog/2006/Jul/msg00014.html