2.9BSD - /usr/include/outmp.h

   1: struct _utmp {
   2:     char    _ut_line[8];        /* tty name */
   3:     char    _ut_name[8];        /* user id */
   4:     long    _ut_time;       /* time on */
   5: /*
   6:  *	The rest of the fields will be taken out.
   7:  *	For now, they are here as place holders.
   8:  */
   9:     short   _ut_jobno;      /* charging job number */
  10:     short   _ut_uid;            /* current user id */
  11:     short   _ut_gid;            /* current group id */
  12:     char    _ut_chuid;      /* user has su'd */
  13:     char    _ut_chgid;      /* user has newgrp'd */
  14: };

Defined struct's