sleep_modevent Function

The sleep_modevent function is the module event handler for Example 5-1. Here is its function definition (again):

static int
sleep_modevent(module_t mod __unused, int event, void *arg)
{

        int error = 0;

        switch (event) {
        case MOD_LOAD:
                error = load(arg);
                break;
        case MOD_UNLOAD:
                error = unload(arg);
                break;
        default:
                error = EOPNOTSUPP;
                break;
        }

        return (error);
}

On module load, this function simply calls the load function. On module unload, it calls the unload function.