When doing some distributed OS homework, I noticed that ioctl() doesn't
properly return the number of bytes pending on a UDP socket.  I send
only one 40 bytes UDP packet to my server, my server ( actually a bridge
program ) then uses ioctl() to determine that amount of bytes pending. 
Instead of coming back with 40 bytes, it comes back with 56 bytes.  I
can also reproduce this behaviour with IRIX 6.5.  Any ideas of what's
going on?

I'm using NetBSD 1.4 with a Quadra 700, 68/2gig.

Thanks,

	-andy