device_t           62 include/sys/device.h typedef int (*devop_open_t)   (device_t, int);
device_t           63 include/sys/device.h typedef int (*devop_close_t)  (device_t);
device_t           64 include/sys/device.h typedef int (*devop_read_t)   (device_t, char *, size_t *, int);
device_t           65 include/sys/device.h typedef int (*devop_write_t)  (device_t, char *, size_t *, int);
device_t           66 include/sys/device.h typedef int (*devop_ioctl_t)  (device_t, u_long, void *);
device_t           67 include/sys/device.h typedef int (*devop_devctl_t) (device_t, u_long, void *);