SAMESTR(9F) Kernel Functions for Drivers SAMESTR(9F)
SAMESTR, samestr - test if next queue is in the same stream
#include <sys/stream.h>
int SAMESTR(queue_t *q);
Architecture independent level 1 (DDI/DKI).
q
Pointer to the queue.
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.
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.
The SAMESTR() function can be called from user, interrupt, context.
OTHERQ(9F)
Writing Device Drivers
STREAMS Programming Guide
January 16, 2006 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
January 16, 2006 SAMESTR(9F)