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Kernel Functions for DriversRD(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 5.9Go To TopLast Changed 15 Nov 1991

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.