To quote udp(7):
All receive operations return only one packet. When the packet is smaller than the passed buffer only that much data is returned, when it is bigger the packet is truncated and the MSG_TRUNC flag is set. MSG_WAITALL is not supported.
But, in both 2.4 and 2.6 it doesn't seem to be honoring that. Someone even wrote a patch:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0206.3/0616.html
which, AFAICT, disappeared into the void.
I think someone should either change the manpage to reflect that udp(7) doesn't support MSG_TRUNC, or change the behavior of udp_recvmsg.
Alexey
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