UTMP(4)              INTERACTIVE UNIX System              UTMP(4)



          NAME
               utmp, wtmp - utmp and wtmp entry formats

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

          DESCRIPTION
               These files, which hold user and accounting information for
               such commands as who(1), write(1), and login(1), have the
               following structure as defined by <utmp.h>:

               #define UTMP_FILE  "/etc/utmp"
               #define WTMP_FILE  "/etc/wtmp"
               #define ut_name    ut_user

               struct     utmp {
                  char        ut_user[8];    /* User login name */
                  char        ut_id[4];      /* /etc/inittab id (usually line #) */
                  char        ut_line[12];   /* device name (console, lnxx) */
                  short       ut_pid;        /* process id */
                  short       ut_type;       /* type of entry */
                  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. */
                  time_t      ut_time;       /* time entry was made */
               };

               /*  Definitions for ut_type */
               #define EMPTY          0
               #define RUN_LVL        1
               #define BOOT_TIME      2
               #define OLD_TIME       3
               #define NEW_TIME       4
               #define INIT_PROCESS   5     /* Process spawned by "init" */
               #define LOGIN_PROCESS  6     /* A "getty" process waiting for login */
               #define USER_PROCESS   7     /* A user process */
               #define DEAD_PROCESS   8
               #define ACCOUNTING     9
               #define UTMAXTYPE ACCOUNTING  /* Largest legal value of ut_type */

               /*  Special strings or formats used in the "ut_line" field when  */
               /*  accounting for something other than a process  */
               /*  No string for the ut_line field can be more than 11 chars +  */
               /*  a NULL in length  */
               #define RUNLVL_MSG  "run-level %c"
               #define BOOT_MSG    "system boot"
               #define OTIME_MSG   "old time"
               #define NTIME_MSG   "new time"

          FILES


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          UTMP(4)              INTERACTIVE UNIX System              UTMP(4)



               /etc/utmp
               /etc/wtmp

          SEE ALSO
               getut(3C).
               login(1), who(1), write(1) in the INTERACTIVE UNIX System
               User's/System Administrator's Reference Manual.
















































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