RD(9F) Kernel Functions for Drivers RD(9F)
RD, rd - get pointer to the read queue
#include <sys/stream.h>
#include <sys/ddi.h>
queue_t *RD(queue_t *q);
Architecture independent level 1 (DDI/DKI).
q
Pointer to the write queue whose read queue is to be returned.
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.
The pointer to the read queue.
The RD() function can be called from user, interrupt, or kernel
context.
See the qreply(9F) function page for an example of RD().
WR(9F), qreply(9F)
Writing Device Drivers
STREAMS Programming Guide
January 16, 2006 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
The RD() function can be called from user, interrupt, or kernel
context.
EXAMPLES
Example 1: Function page reference
See the qreply(9F) function page for an example of RD().
SEE ALSO
WR(9F), qreply(9F)
Writing Device Drivers
STREAMS Programming Guide
January 16, 2006 RD(9F)