SAMESTR(9F) Kernel Functions for Drivers SAMESTR(9F)NAME
SAMESTR, samestr - test if next queue is in the same stream
SYNOPSIS
#include <sys/stream.h>
int SAMESTR(queue_t *q);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the queue.
DESCRIPTION
The SAMESTR() function is used to see if the next queue in a stream (if it exists) is the same type as the current queue (that is, both are
read queues or both are write queues). This function accounts for the twisted queue connections that occur in a STREAMS pipe and should be
used in preference to direct examination of the q_next field of queue(9S) to see if the stream continues beyond q.
RETURN VALUES
The SAMESTR() function returns 1 if the next queue is the same type as the current queue. It returns 0 if the next queue does not exist or
if it is not the same type.
CONTEXT
The SAMESTR() function can be called from user, interrupt, context.
SEE ALSO OTHERQ(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.11 16 Jan 2006 SAMESTR(9F)
Check Out this Related Man Page
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
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 qreply(9F), WR(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.11 16 Jan 2006 RD(9F)
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Junaid (1 Reply)