nsUserIdleServiceX.mm

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsUserIdleServiceX.h"

#include "nsObjCExceptions.h"

#import <Foundation/Foundation.h>

bool nsUserIdleServiceX::PollIdleTime(uint32_t* aIdleTime) {

  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;

  kern_return_t rval;

  mach_port_t masterPort;

  rval = IOMasterPort(kIOMasterPortDefault, &masterPort);

  if (rval != KERN_SUCCESS) return false;

  io_iterator_t hidItr;

  rval = IOServiceGetMatchingServices(

      masterPort, IOServiceMatching("IOHIDSystem"), &hidItr);

  if (rval != KERN_SUCCESS) return false;

  NS_ASSERTION(hidItr, "Our iterator is null, but it ought not to be!");

  io_registry_entry_t entry = IOIteratorNext(hidItr);

  NS_ASSERTION(entry, "Our IO Registry Entry is null, but it shouldn't be!");

  IOObjectRelease(hidItr);

  NSMutableDictionary* hidProps;

  rval = IORegistryEntryCreateCFProperties(

      entry, (CFMutableDictionaryRef*)&hidProps, kCFAllocatorDefault, 0);

  if (rval != KERN_SUCCESS) return false;

  NS_ASSERTION(hidProps, "HIDProperties is null, but no error was returned.");

  [hidProps autorelease];

  id idleObj = [hidProps objectForKey:@"HIDIdleTime"];

  NS_ASSERTION([idleObj isKindOfClass:[NSData class]] ||

                   [idleObj isKindOfClass:[NSNumber class]],

               "What we got for the idle object is not what we expect!");

  uint64_t time;

  if ([idleObj isKindOfClass:[NSData class]])

    [idleObj getBytes:&time length:sizeof(time)];

  else

    time = [idleObj unsignedLongLongValue];

  IOObjectRelease(entry);

  // convert to ms from ns

  time /= 1000000;

  if (time > UINT32_MAX)  // Overflow will occur

    return false;

  *aIdleTime = static_cast<uint32_t>(time);

  return true;

  NS_OBJC_END_TRY_BLOCK_RETURN(false);