iokit/Kernel/IOCommand.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 /*
  24  *
  25  *      Copyright (c) 2000 Apple Computer, Inc.  All rights reserved.
  26  *
  27  *      HISTORY
  28  *
  29  *      11/13/2000              CJS             Created IOCommand class and implementation
  30  *
  31  */
  32
  33 #include <IOKit/IOCommand.h>
  34
  35 #define super OSObject
  36 OSDefineMetaClassAndAbstractStructors(IOCommand, OSObject);
  37
  38
  39 //--------------------------------------------------------------------------
  40 //      init -  initialize our data structures
  41 //--------------------------------------------------------------------------
  42
  43 bool IOCommand::init(void)
  44 {
  45     if (super::init()) {
  46         queue_init(&fCommandChain);
  47         return true;
  48     }
  49     else
  50         return false;
  51 }