RD(9F)

NAME

     RD, rd - get pointer to the read queue

SYNOPSIS

     #include <sys/stream.h>
     #include <sys/ddi.h>

     queue_t *RD(queue_t *q);

INTERFACE LEVEL

     Architecture independent level 1 (DDI/DKI).

PARAMETERS

     q     Pointer to the write queue whose read queue is  to  be
           returned.

DESCRIPTION

     The RD() function accepts a write queue pointer as an  argu-
     ment  and  returns  a  pointer to the read queue of the same
     module.

     CAUTION: Make sure  the  argument  to  this  function  is  a
     pointer  to  a  write  queue.  RD() will not check for queue
     type, and a system panic could result if it is not the right
     type.

RETURN VALUES

     The pointer to the read queue.

CONTEXT

     RD() can be called from user or interrupt context.

EXAMPLES

     Example 1: Function page reference

     See the qreply(9F) function page for an example of RD().

SEE ALSO

     qreply(9F), WR(9F)

     Writing Device Drivers

      STREAMS Programming Guide