CANPUT(9F) Kernel Functions for Drivers CANPUT(9F)
canput - test for room in a message queue
#include <sys/stream.h> int canput
Architecture independent level 1 (DDI/DKI).
Pointer to the message queue.
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 in
the queue. canputnext(q)
and bcanputnext(q, pri)
should always be used in preference
and bcanput(q->q_next, pri)
RETURN VALUES 1
If the message queue is not full. 0
If the queue is full.
can be called from user or interrupt context.
SEE ALSO bcanput(9F)
, putnext(9F) Writing Device Drivers STREAMS Programming Guide
Drivers are responsible for both testing a queue with canput()
refraining from placing a message on the queue if canput()
April 11, 1991 CANPUT(9F)