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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 */
#include "nsUserIdleServiceX.h"
#include "nsObjCExceptions.h"
#import <Foundation/Foundation.h>
bool nsUserIdleServiceX::PollIdleTime(uint32_t* aIdleTime) {
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!");
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)];
time = [idleObj unsignedLongLongValue];
// convert to ms from ns
time /= 1000000;
if (time > UINT32_MAX) // Overflow will occur
return false;
*aIdleTime = static_cast<uint32_t>(time);
return true;