mdv_chandler
devfs_msg->mdv_chandler.name = name;
devfs_msg->mdv_chandler.nhandler = handler;
devfs_chandler_add_worker(msg->mdv_chandler.name,
msg->mdv_chandler.nhandler);
devfs_chandler_del_worker(msg->mdv_chandler.name);
msg->mdv_chandler.name = name;
msg->mdv_chandler.nhandler = nhandler;
msg->mdv_chandler.name = name;
msg->mdv_chandler.nhandler = NULL;