STREAMS/UX for the HP 9000 Reference Manual

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Differences Between STREAMS/UX and System V Release 4 STREAMS
HP-UX Changes to STREAMS/UX System Calls
Write Offset
A module or driver can send the STREAM head an M_SETOPTS message
telling it to put an offset in the beginning of each data buffer segment (i.e.
message) sent by a write call. See Chapter 5 of the SVR4.2 STREAMS
manual for more information. STREAMS/UX will not put the offset into a
message if the resulting message size exceeds STRMSGZ.