int random_open(dev_t dev, int flags, int devtype, struct proc *pp);
int random_close(dev_t dev, int flags, int mode, struct proc *pp);
int random_read(dev_t dev, struct uio *uio, int ioflag);
int random_write(dev_t dev, struct uio *uio, int ioflag);
int random_open(dev_t dev, int flags, int devtype, struct proc *pp);
int random_close(dev_t dev, int flags, int mode, struct proc *pp);
int random_read(dev_t dev, struct uio *uio, int ioflag);
int random_write(dev_t dev, struct uio *uio, int ioflag);