OSX/libsecurity_utilities/lib/powerwatch.cpp

   1 /*
   2  * Copyright (c) 2000-2004,2011-2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
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   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,
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  18  * Please see the License for the specific language governing rights and
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  23
  24
  25 //
  26 // powerwatch - hook into system notifications of power events
  27 //
  28 #include "powerwatch.h"
  29 #include <IOKit/IOMessage.h>
  30
  31 #if TARGET_OS_OSX
  32
  33 namespace Security {
  34 namespace MachPlusPlus {
  35
  36
  37 //
  38 // The obligatory empty virtual destructor
  39 //
  40 PowerWatcher::~PowerWatcher()
  41 { }
  42
  43
  44 //
  45 // The default NULL implementations of the callback virtuals.
  46 // We define these (rather than leaving them abstract) since
  47 // many users want only one of these events.
  48 //
  49 void PowerWatcher::systemWillSleep()
  50 { }
  51
  52 void PowerWatcher::systemIsWaking()
  53 { }
  54
  55 void PowerWatcher::systemWillPowerDown()
  56 { }
  57
  58 void PowerWatcher::systemWillPowerOn()
  59 { }
  60
  61 //
  62 // IOPowerWatchers
  63 //
  64
  65 IOPowerWatcher::IOPowerWatcher() :
  66     mKernelPort(0)
  67 {
  68         if (!(mKernelPort = ::IORegisterForSystemPower(this, &mPortRef, ioCallback, &mHandle)))
  69                 UnixError::throwMe(EINVAL);     // no clue
  70 }
  71
  72 IOPowerWatcher::~IOPowerWatcher()
  73 {
  74         if (mKernelPort)
  75                 ::IODeregisterForSystemPower(&mHandle);
  76 }
  77
  78 //
  79 // The callback dispatcher
  80 //
  81 void IOPowerWatcher::ioCallback(void *refCon, io_service_t service,
  82     natural_t messageType, void *argument)
  83 {
  84     IOPowerWatcher *me = (IOPowerWatcher *)refCon;
  85     enum { allow, refuse, ignore } reaction;
  86     switch (messageType) {
  87     case kIOMessageSystemWillSleep:
  88         secnotice("powerwatch", "system will sleep");
  89         me->systemWillSleep();
  90         reaction = allow;
  91         break;
  92     case kIOMessageSystemHasPoweredOn:
  93         secnotice("powerwatch", "system has powered on");
  94         me->systemIsWaking();
  95         reaction = ignore;
  96         break;
  97     case kIOMessageSystemWillPowerOff:
  98         secnotice("powerwatch", "system will power off");
  99         me->systemWillPowerDown();
 100         reaction = allow;
 101         break;
 102     case kIOMessageSystemWillNotPowerOff:
 103         secnotice("powerwatch", "system will not power off");
 104         reaction = ignore;
 105         break;
 106     case kIOMessageCanSystemSleep:
 107         secnotice("powerwatch", "can system sleep");
 108         reaction = allow;
 109         break;
 110     case kIOMessageSystemWillNotSleep:
 111         secnotice("powerwatch", "system will not sleep");
 112         reaction = ignore;
 113         break;
 114     case kIOMessageCanSystemPowerOff:
 115         secnotice("powerwatch", "can system power off");
 116         reaction = allow;
 117         break;
 118         case kIOMessageSystemWillPowerOn:
 119         secnotice("powerwatch", "system will power on");
 120                 me->systemWillPowerOn();
 121         reaction = ignore;
 122         break;
 123     default:
 124         secnotice("powerwatch",
 125             "type 0x%x message received (ignored)", messageType);
 126         reaction = ignore;
 127         break;
 128     }
 129
 130     // handle acknowledgments
 131     switch (reaction) {
 132     case allow:
 133                 secnotice("powerwatch", "calling IOAllowPowerChange");
 134         IOAllowPowerChange(me->mKernelPort, long(argument));
 135         break;
 136     case refuse:
 137                 secnotice("powerwatch", "calling IOCancelPowerChange");
 138         IOCancelPowerChange(me->mKernelPort, long(argument));
 139         break;
 140     case ignore:
 141                 secnotice("powerwatch", "sending no response");
 142         break;
 143     }
 144 }
 145
 146
 147 //
 148 // The MachServer hookup
 149 //
 150 PortPowerWatcher::PortPowerWatcher()
 151 {
 152     port(IONotificationPortGetMachPort(mPortRef));
 153 }
 154
 155 boolean_t PortPowerWatcher::handle(mach_msg_header_t *in)
 156 {
 157     IODispatchCalloutFromMessage(NULL, in, mPortRef);
 158     return TRUE;
 159 }
 160
 161
 162 } // end namespace MachPlusPlus
 163
 164 } // end namespace Security
 165
 166 #endif //TARGET_OS_OSX