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int devmap_null_create(void)

{

    int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);

    if (phone < 0)

        return -1;

    ipcarg_t null_id;

    int retval = async_req_0_1(phone, DEVMAP_DEVICE_NULL_CREATE, &null_id);

    if (retval != EOK)

        return -1;

    return (int) null_id;

}

void devmap_null_destroy(int null_id)

{

    int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);

    if (phone < 0)

        return;

    async_req_1_0(phone, DEVMAP_DEVICE_NULL_DESTROY, (ipcarg_t) null_id);

}