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Kernel Functions for Driversqunbufcall(9F)


NAME

 qunbufcall - cancel a pending qbufcall request

SYNOPSIS

 
#include <sys/stream.h>
 #include <sys/ddi.h>
 
void qunbufcall(queue_t *q, bufcall_id_t id);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
q
Pointer to STREAMS queue_t structure.
id
Identifier returned from qbufcall(9F)

DESCRIPTION

 

qunbufcall() cancels a pending qbufcall() request. The argument id is a non-zero identifier of the request to be cancelled. id is returned from the qbufcall() function used to issue the cancel request.

The qunbufcall() function is tailored to be used with the enhanced STREAMS framework interface which is based on the concept of perimeters. (See mt-streams(9F).) qunbufcall() returns when the bufcall has been cancelled or finished executing. The bufcall will be cancelled even if it is blocked at the perimeters associated with the queue. All outstanding bufcalls should be cancelled before the driver closes or module returns.

CONTEXT

 

qunbufcall() can be called from user or interrupt context.

SEE ALSO

 

mt-streams(9F), qbufcall(9F), qtimeout(9F), quntimeout(9F)

Writing Device Drivers

STREAMS Programming Guide


SunOS 5.9Go To TopLast Changed 18 Feb 1998

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