Log the return value of the Kext Manager in a human-readable form.

logKextManager.m

- (void)logKextManager:(OSReturn)osr
{
    switch (osr) {
        case kOSMetaClassDuplicateClass:
            NSLog(@"A duplicate Libkern C++ classname was encountered during kext loading.");
            break;
        case kOSMetaClassHasInstances:
            NSLog(@"A kext cannot be unloaded because there are instances derived from Libkern C++ classes that it defines.");
            break;
        case kOSMetaClassInstNoSuper:
            NSLog(@"Internal error: No superclass can be found when constructing an instance of a Libkern C++ class.");
            break;
        case kOSMetaClassInternal:
            NSLog(@"Internal OSMetaClass run-time error.");
            break;
        case kOSMetaClassNoDicts:
            NSLog(@"Internal error: An allocation failure occurred registering Libkern C++ classes during kext loading.");
            break;
        case kOSMetaClassNoInit:
            NSLog(@"Internal error: The Libkern C++ class registration system was not properly initialized during kext loading.");
            break;
        case kOSMetaClassNoInsKModSet:
            NSLog(@"Internal error: An error occurred registering a specific Libkern C++ class during kext loading.");
            break;
        case kOSMetaClassNoKext:
            NSLog(@"Internal error: The kext for a Libkern C++ class can't be found during kext loading.");
            break;
        case kOSMetaClassNoKModSet:
            NSLog(@"Internal error: An allocation failure occurred registering Libkern C++ classes during kext loading.");
            break;
        case kOSMetaClassNoSuper:
            NSLog(@"Internal error: No superclass can be found for a specific Libkern C++ class during kext loading.");
            break;
        case kOSMetaClassNoTempData:
            NSLog(@"Internal error: An allocation failure occurred registering Libkern C++ classes during kext loading.");
            break;
        case kOSReturnError:
            NSLog(@"Unspecified Libkern error. Not equal to KERN_FAILURE.");
            break;
        case kOSReturnSuccess:
            NSLog(@"Operation successful. Equal to KERN_SUCCESS.");
            break;
        case -603947004:
            NSLog(@"Root privileges required. Try running the command with 'sudo'.");
            break;
        case -603947002:
            NSLog(@"Kext not loaded.");
            break;
        default:
            NSLog(@"Unknown error unloading kext.");
    }
}