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Kernel Functions for Driverscanput(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 message 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 5.9Go To TopLast Changed 11 Apr 1991

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.