BCANPUT(9F) Kernel Functions for Drivers BCANPUT(9F)
bcanput - test for flow control in specified priority band
#include <sys/stream.h>
int bcanput(queue_t *q, unsigned char pri);
Architecture independent level 1 (DDI/DKI).
q
Pointer to the message queue.
pri
Message priority.
The bcanput() function searches through the stream (starting at q)
until it finds a queue containing a service routine where the message
can be enqueued, or until it reaches the end of the stream. If found,
the queue containing the service routine is tested to see if there is
room for a message of priority pri in the queue.
If pri is 0, bcanput() is equivalent to a call with canput(9F).
canputnext(q) and bcanputnext(q,pri) should always be used in
preference to canput(q->q_next) and bcanput(q->q_next,pri)
respectively.
1
If a message of priority pri can be placed on the queue.
0
If the priority band is full.
The bcanput() function can be called from user, interrupt, or kernel
context.
bcanputnext(9F), canput(9F), canputnext(9F), putbq(9F), putnext(9F)
Writing Device Drivers
STREAMS Programming Guide
Drivers are responsible for both testing a queue with bcanput() and
refraining from placing a message on the queue if bcanput() fails.
January 16, 2006 BCANPUT(9F)
NAME
bcanput - test for flow control in specified priority band
SYNOPSIS
#include <sys/stream.h>
int bcanput(queue_t *q, unsigned char pri);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q
Pointer to the message queue.
pri
Message priority.
DESCRIPTION
The bcanput() function searches through the stream (starting at q)
until it finds a queue containing a service routine where the message
can be enqueued, or until it reaches the end of the stream. If found,
the queue containing the service routine is tested to see if there is
room for a message of priority pri in the queue.
If pri is 0, bcanput() is equivalent to a call with canput(9F).
canputnext(q) and bcanputnext(q,pri) should always be used in
preference to canput(q->q_next) and bcanput(q->q_next,pri)
respectively.
RETURN VALUES
1
If a message of priority pri can be placed on the queue.
0
If the priority band is full.
CONTEXT
The bcanput() function can be called from user, interrupt, or kernel
context.
SEE ALSO
bcanputnext(9F), canput(9F), canputnext(9F), putbq(9F), putnext(9F)
Writing Device Drivers
STREAMS Programming Guide
WARNINGS
Drivers are responsible for both testing a queue with bcanput() and
refraining from placing a message on the queue if bcanput() fails.
January 16, 2006 BCANPUT(9F)