FreeBSD/Linux Kernel Cross Reference
sys/include/utmp.h

     /* The <utmp.h> header is used by init, login, who, etc. */
     
     #ifndef _UTMP_H
     #define _UTMP_H
     
     #define WTMP  "/usr/adm/wtmp"   /* the login history file */
     #define BTMP  "/usr/adm/btmp"   /* the bad-login history file */
     #define UTMP  "/etc/utmp"       /* the user accouting file */
     
    struct utmp {
      char ut_user[8];              /* user name */
      char ut_id[4];                /* /etc/inittab ID */
      char ut_line[12];             /* terminal name */
      char ut_host[16];             /* host name, when remote */
      short ut_pid;                 /* process id */
      short int ut_type;            /* type of entry */
      long ut_time;                 /* login/logout time */
    };
    
    #define ut_name ut_user         /* for compatibility with other systems */
    
    /* Definitions for ut_type. */
    #define RUN_LVL            1    /* this is a RUN_LEVEL record */
    #define BOOT_TIME          2    /* this is a REBOOT record */
    #define INIT_PROCESS       5    /* this process was spawned by INIT */
    #define LOGIN_PROCESS      6    /* this is a 'getty' process waiting */
    #define USER_PROCESS       7    /* any other user process */
    #define DEAD_PROCESS       8    /* this process has died (wtmp only) */
    
    #endif /* _UTMP_H */

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