Each STREAMS
driver or module must have a streamtab structure.
streamtab is made up of qinit structures for both the read and write queue portions of each
module or driver. Multiplexing drivers require both upper and lower qinit structures. The qinit structure
contains the entry points through which the module or driver routines are
called.
Normally, the read QUEUE contains the open and close routines. Both the read and
write queue can contain put and service procedures.
