If the client gets iounit equal to zero, it has to pick a greater-than-zero number. msize - IOHDRSZ is the maximum number of bytes that can be read/written with a single message.
I guess the kernel is the authoritative source on this, even though the man pages don't mention it. I'll capitulate.
-- Kris Maglione An alcoholic is a person who drinks more than his own physician.
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