int can_ioctl_query(struct canuser_t *canuser, unsigned long what);
int can_ioctl_remote_read(struct canuser_t *canuser, struct canmsg_t *rtr_msg,
unsigned long rtr_id, int options);
int can_ioctl_query(struct canuser_t *canuser, unsigned long what);
int can_ioctl_remote_read(struct canuser_t *canuser, struct canmsg_t *rtr_msg,
unsigned long rtr_id, int options);