'\" te
.\"  Copyright 1989 AT&T
.\"  Copyright (c) 2006, Sun Microsystems, Inc.  All Rights Reserved
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.TH RD 9F "16 Jan 2006" "SunOS 5.11" "Kernel Functions for Drivers"
.SH NAME
RD, rd \- get pointer to the read queue
.SH SYNOPSIS
.LP
.nf
#include <sys/stream.h>
#include <sys/ddi.h>



\fBqueue_t *\fR\fBRD\fR(\fBqueue_t *\fR\fIq\fR);
.fi

.SH INTERFACE LEVEL
.sp
.LP
Architecture independent level 1 (\fBDDI/DKI)\fR.
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIq\fR\fR
.ad
.RS 5n
.rt  
Pointer to the \fBwrite\fR queue whose \fBread\fR queue is to be returned.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBRD()\fR function accepts a \fBwrite\fR queue pointer as an argument and
returns a pointer to the \fBread\fR queue of the same module.
.sp
.LP
\fBCAUTION:\fR Make sure the argument to this function is a pointer to a
\fBwrite\fR queue. \fBRD()\fR will not check for queue type, and a system panic
could result if it is not the right type.
.SH RETURN VALUES
.sp
.LP
The pointer to the \fBread\fR queue.
.SH CONTEXT
.sp
.LP
The \fBRD()\fR function can be called from user, interrupt, or kernel context.
.SH EXAMPLES
.LP
\fBExample 1 \fRFunction page reference
.sp
.LP
See the \fBqreply\fR(9F) function page for an example of \fBRD()\fR.

.SH SEE ALSO
.sp
.LP
\fBqreply\fR(9F), \fBWR\fR(9F)
.sp
.LP
\fIWriting Device Drivers\fR
.sp
.LP
\fISTREAMS Programming Guide\fR