code:

struct utmp
{
        char ut_user[256] ;             /* User login name */
        char ut_id[14] ;                /* /etc/inittab id */
        char ut_line[64] ;              /* device name (console, lnxx) */
        pid_t ut_pid ;                  /* process id */
        short ut_type ;                 /* type of entry */
#if !defined(__64BIT__) && !defined(__ia64)
        int __time_t_space;             /* for 32vs64-bit time_t PPC */
#endif
        time_t ut_time ;                /* time entry was made */
#if !defined(__64BIT__) && defined(__ia64)
        int __time_t_space;             /* for 32vs64-bit time_t IA64 */
#endif
        struct exit_status
          {
            short e_termination ;       /* Process termination status */
            short e_exit ;              /* Process exit status */
          }
        ut_exit ;                       /* The exit status of a process
                                         * marked as DEAD_PROCESS.
                                         */
        char ut_host[256] ;             /* host name */
        int __dbl_word_pad;             /* for double word alignment */
        int __reservedA[2];
        int __reservedV[6];
} ;