qsize(9F) Kernel Functions for Drivers qsize(9F)NAME
qsize - find the number of messages on a queue
SYNOPSIS
#include <sys/stream.h>
int qsize(queue_t *q);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Queue to be evaluated.
DESCRIPTION
qsize() evaluates the queue q and returns the number of messages it contains.
RETURN VALUES
If there are no message on the queue, qsize() returns 0. Otherwise, it returns the integer representing the number of messages on the
queue.
CONTEXT
qsize() can be called from user or interrupt context.
SEE ALSO
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 11 Apr 1991 qsize(9F)
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canput(9F) Kernel Functions for Drivers canput(9F)NAME
canput - test for room in a message queue
SYNOPSIS
#include <sys/stream.h>
int canput(queue_t *q);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the message queue.
DESCRIPTION
canput() 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 mes-
sage in the queue.
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 the message queue is not full.
0 If the queue is full.
CONTEXT
canput() can be called from user or interrupt context.
SEE ALSO bcanput(9F), bcanputnext(9F), canputnext(9F), putbq(9F), putnext(9F)
Writing Device Drivers
STREAMS Programming Guide
WARNINGS
Drivers are responsible for both testing a queue with canput() and refraining from placing a message on the queue if canput() fails.
SunOS 5.10 11 Apr 1991 canput(9F)
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