KSPowerAssertion

KSPowerAssertion.h

//
//  KSPowerAssertion.h
//  Sandvox
//
//  Created by Mike Abdullah on 04/08/2012.
//  Copyright © 2012 Karelia Software
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import <Foundation/Foundation.h>
#import <IOKit/pwr_mgt/IOPMLib.h>


extern NSString *KSIOReturnErrorDomain;


@interface KSPowerAssertion : NSObject
{
  @private
    IOPMAssertionID _assertionID;
}

- (id)initWithType:(CFStringRef)type name:(NSString *)name error:(NSError **)error;

@end

KSPowerAssertion.m

//
//  KSPowerAssertion.m
//  Sandvox
//
//  Created by Mike Abdullah on 04/08/2012.
//  Copyright © 2012 Karelia Software
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "KSPowerAssertion.h"


NSString *KSIOReturnErrorDomain = @"com.apple.framework.IOKit.IOReturn";


@implementation KSPowerAssertion

- (id)initWithType:(CFStringRef)type name:(NSString *)name error:(NSError **)error;
{
    if (self = [self init])
    {
        IOReturn result = IOPMAssertionCreateWithName(type,
                                                      kIOPMAssertionLevelOn,
                                                      (CFStringRef)name,
                                                      &_assertionID);
        
        if (result != kIOReturnSuccess)
        {
            [self release]; self = nil;
            if (error)
            {
                *error = [NSError errorWithDomain:KSIOReturnErrorDomain code:result userInfo:nil];
            }
        }
    }
    
    return self;
}

- (void)dealloc;
{
    // It would be very very weird for cancellation to fail, so best bet seems to be to log it
    IOReturn released = IOPMAssertionRelease(_assertionID);
    if (released != kIOReturnSuccess)
    {
        NSLog(@"Re-enabling idle sleep failed: error %i", released);
    }
    
    [super dealloc];
}

@end