debian man page for bcanput

bcanput(9F)						   Kernel Functions for Drivers 					       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
       bcanput()  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
       bcanput() can be called from user or interrupt 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.

SunOS 5.10							    11 Apr 1991 						       bcanput(9F)