mojave man page for rd

RD(9F)							   Kernel Functions for Drivers 						    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 argument 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

SunOS 5.10							    15 Nov 1991 							    RD(9F)