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 Drivers and Modules
The Stream head provides the interface between HP-UX system calls and
STREAMS/UX utilities in the kernel. The Stream head is the first queue
pair of every Stream and is involved in flow control. Data being read from a
stream will be taken off the stream head.
pipemod
Module ID Number: 5303
Maximum Packet Size: 8192
Minimum Packet Size: 0
High Water Mark: 8192
Low Water Mark: 8191
pipemod handles M_FLUSH messages in STREAMS/UX-based pipes.
pipemod is described in the UNIX System V Release 4 Programmer's Guide:
STREAMS manual.