>> > > 	- when userland process consumes ancillary data (via recvmsg)
>> >When the process does the rcvmsg() is when you can re-pack, if necessary.
>> 	Chris basically suggested to avoid re-packing, and I agree re-packing
>> 	is not a good thing.  I'm very very stuck here...
>OK, i thought that you had an intermediate representation, rather than
>packing into the right format directly in the networking protocol
>stack code.

	we don't have intermediate data representation right now.  i'm not
	sure if we can introduce one, since i'm not sure if control data
	stream (accessed via sbappendcontrol) is always formatted by CMSG_xx
	or not.

>Indeed, in that case, you can't avoid repacking.

	yup.  i'll try to write up repacking code.

itojun