sys/OSThermalNotification.c

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <libkern/OSThermalNotification.h>
  25 #include <notify.h>
  26
  27 const char *kOSThermalNotificationName = "com.apple.system.thermalstatus";
  28
  29 OSThermalNotificationLevel OSThermalNotificationCurrentLevel(void)
  30 {
  31         uint64_t val;
  32         int token;
  33
  34         if (NOTIFY_STATUS_OK != notify_register_check(kOSThermalNotificationName, &token))
  35                 return OSThermalNotificationLevelAny;
  36
  37         if (NOTIFY_STATUS_OK != notify_get_state(token, &val))
  38                 return OSThermalNotificationLevelAny;
  39
  40         if (NOTIFY_STATUS_OK != notify_cancel(token))
  41                 return OSThermalNotificationLevelAny;
  42
  43         return (OSThermalNotificationLevel)val;
  44 }