STREAMS-UX Programmer's Guide (February 2007)

Multiplexing
Connecting and Disconnecting Multiplexor Configurations
Chapter 5
115
The above plumbing causes any messages reaching the top of the stream from the driver below to be
delivered to the multiplexing driver’s lower-half read-side put and service procedures. The multiplexing
stream becomes the controlling stream. This plumbing relationship is remembered by the STREAMS
framework until the controlling stream is closed, or the stream below is unlinked through I_UNLINK.