Kernel Functions for Drivers                          SAMESTR(9F)



NAME
     SAMESTR, samestr - test if next queue is in the same stream

SYNOPSIS
     #include 



     int SAMESTR(queuet *q);


INTERFACE LEVEL
     Architecture independent level 1 (DI/DKI).

PARAMETERS
     q    Pointer to the queue.


DESCRIPTION
     The SAMESTR() function is used to see if the next queue in a
     stream  (if it exists) is the same type as the current queue
     (that is, both are read queues or both  are  write  queues).
     This  function  accounts  for  the twisted queue connections
     that occur in a STREAMS pipe and should be used  in  prefer-
     ence  to direct examination of the qnext field of queue(9S)
     to see if the stream continues beyond q.

RETURN VALUES
     The SAMESTR() function returns 1 if the next  queue  is  the
     same  type  as  the  current queue. It returns 0 if the next
     queue does not exist or if it is not the same type.

CONTEXT
     The SAMESTR() function can be called from  user,  interrupt,
     context.

SEE ALSO
     OTHERQ(9F)


     Writing Device Drivers


     STREAMS Programming Guide











SunOS 5.11          Last change: 16 Jan 2006                    1