ret = can_ioctl_remote_read(canuser, &rtr_msg, rtr_msg.id, 0);
if(ret<0) return ret;
copy_to_user((void*)arg, &rtr_msg, sizeof(struct canmsg_t));
ret = can_ioctl_remote_read(canuser, &rtr_msg, rtr_msg.id, 0);
if(ret<0) return ret;
copy_to_user((void*)arg, &rtr_msg, sizeof(struct canmsg_t));