iokit/Kernel/IOCommand.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  *
  31  *      Copyright (c) 2000 Apple Computer, Inc.  All rights reserved.
  32  *
  33  *      HISTORY
  34  *
  35  *      11/13/2000              CJS             Created IOCommand class and implementation
  36  *
  37  */
  38
  39 #include <IOKit/IOCommand.h>
  40
  41 #define super OSObject
  42 OSDefineMetaClassAndStructors(IOCommand, OSObject);
  43
  44
  45 //--------------------------------------------------------------------------
  46 //      init -  initialize our data structures
  47 //--------------------------------------------------------------------------
  48
  49 bool IOCommand::init(void)
  50 {
  51     if (super::init()) {
  52         queue_init(&fCommandChain);
  53         return true;
  54     }
  55     else
  56         return false;
  57 }