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Minimal test - lines (9, 58)

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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(time);

  return true;

  NS_OBJC_END_TRY_BLOCK_RETURN(false);
}