#ifndef ZD_COMMON_H#define ZD_COMMON_H#include <linux/if.h>struct  zd_point{    caddr_t       pointer;    __u16         length;};struct  zdreq{    union    {        char    ifrn_name[IFNAMSIZ];    } ifr_ifrn;    union    {        struct  zd_point data;    } u;};typedef struct oid_wrap{    u16 request;    u16 seq;    union    {        struct        {            u16 status;        } dev;        struct        {            u32 oid;            u32 status;            u32 length;            u8  data[512];        } info;    } u;} oid_wrap_t;#define ZD_GENERIC_OID_HDR_LEN \((int) (&((struct oid_wrap *) 0)->u.info.data))#endif