iokit/Kernel/IOCommand.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 /*
  32  *
  33  *      Copyright (c) 2000 Apple Computer, Inc.  All rights reserved.
  34  *
  35  *      HISTORY
  36  *
  37  *      11/13/2000              CJS             Created IOCommand class and implementation
  38  *
  39  */
  40
  41 #include <IOKit/IOCommand.h>
  42
  43 #define super OSObject
  44 OSDefineMetaClassAndStructors(IOCommand, OSObject);
  45
  46
  47 //--------------------------------------------------------------------------
  48 //      init -  initialize our data structures
  49 //--------------------------------------------------------------------------
  50
  51 bool IOCommand::init(void)
  52 {
  53     if (super::init()) {
  54         queue_init(&fCommandChain);
  55         return true;
  56     }
  57     else
  58         return false;
  59 }