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From: shankar@hpclscu.HP.COM (Shankar Unni)
Newsgroups: comp.sys.hp
Subject: Re: question regarding how hpux uses /etc/utmp.
Message-ID: <1340049@hpclscu.HP.COM>
Date: 27 Mar 89 21:39:46 GMT
References: <1256@special-k.ai.mit.edu>
Organization: Hewlett-Packard Calif. Language Lab
Lines: 39

> I am trying to port a finger program to the hp's (hpux version 6.2) and 
> notice that the utmp file in the hp's often contains more entries than 
> the number of users logged in. However, the "who" program distributed by hp 
> seems to do the right thing. Since I dont have sources, could someone

Check the man page on utmp (4).

    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 */
    };

The field "ut_type" tells you what kind of an entry this is:

    /*  Definitions for ut_type  */
    #define   EMPTY           0
    /* ..... */
    #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
    /* ... */
    
There are many more types: SysVish utmp's are cluttered with all kinds of
fascinating stuff. Read the man page for full details.

The ones you are interested in are the "USER_PROCESS" entries.
---
Shankar Unni.
HP Computer Language Lab.