UTMP(5)                   Minix Programmer's Manual                    UTMP(5)


NAME
     utmp, wtmp - logged in users, login and logout history

SYNOPSIS
     #include <sys/types.h>
     #include <utmp.h>

DESCRIPTION
     The files /etc/utmp and /usr/adm/wtmp respectively contain the  currently
     logged in users, and the history of logins and logouts.

     Each file is an array of the following structure defined in <utmp.h>:

     struct utmp {
          char           ut_user[8];    /* user name */
          char           ut_line[12];   /* terminal name */
          char           ut_host[16];   /* host name, when remote */
          time_t         ut_time;       /* login/logout time */
     };

     #define ut_name ut_user /* for compatibility with other systems */

     The structure contains more fields than those listed, but they  are  only
     of  interest  to  init  and  login.   Note  that  the  ut_name field is a
     compatibility alias for ut_user, it is actually better to use it.

     A login entry is completely specified.  A logout entry has a null  string
     for  ut_name.  A shutdown or reboot entry has an ut_line field containing
     a "~" (tilde).  The ut_name field is usually the name of the program that
     did  the  shutdown,  or "reboot" at reboot.  This is a bit confusing, but
     one this is clear:  If you see just one such entry then  the  system  has
     crashed,  if  you  see two entries then the system was properly shut down
     and later rebooted.

FILES

     /etc/utmp                Currently logged in users.

     /usr/adm/wtmp            History of logins and logouts.

SEE ALSO
     who(1), ttyslot(3).

AUTHOR
     Kees J. Bot (kjb@cs.vu.nl)













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