te
Copyright 2006 Sun Microsystems.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
qunbufcall - cancel a pending qbufcall request

#include <sys/stream.h>
 #include <sys/ddi.h>


void qunbufcall(queue_t *q, bufcall_id_t id);

illumos DDI specific (illumos DDI). q id The qunbufcall() function 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 timeouts and bufcalls must be cancelled before a driver close routine can block and before the close routine calls qprocsoff(9F).

The qunbufcall() function can be called from user, interrupt, or kernel context. mt-streams(9F), qbufcall(9F), qtimeout(9F), quntimeout(9F)

Writing Device Drivers

STREAMS Programming Guide