Apple C++

bool IODMAEventSource::init(
    OSObject *inOwner,
    IOService *inProvider,
    Action inCompletion,
    Action inNotification,
    UInt32 inDMAIndex
) {
    IOReturn result;

    if (!super::init(inOwner)) {
        return false;
    }

    if (inProvider == 0) {
        return false;
    }

    dmaProvider = inProvider;
    dmaIndex = 0xFFFFFFFF;
    dmaCompletionAction = inCompletion;
    dmaNotificationAction = inNotification;

    dmaController = IODMAController::getController(dmaProvider, inDMAIndex);
    if (dmaController == 0) {
        return false;
    }
    dmaController->retain();

    result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
    if (result != kIOReturnSuccess) {
        return false;
    }

    queue_init(&dmaCommandsCompleted);
    dmaCommandsCompletedLock = IOSimpleLockAlloc();

    return true;
}