From owner-freebsd-questions  Sat Dec  2 15: 3:37 2000
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Subject: Re: Ghosted logins
To: chris@awww.jeah.net (Chris Byrnes)
Date: Sat, 2 Dec 2000 15:03:33 -0800 (PST)
Cc: questions@freebsd.org
In-Reply-To: <200012021404.eB2E45j63561@awww.jeah.net> from "Chris Byrnes" at Dec 02, 2000 08:04:05 AM
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From: dima@unixfreak.org (Dima Dorfman)
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Chris Byrnes wrote:
> 
> nessun           qk       nas-75-66.indy-t Thu05PM 1day  -
> 
> That person hasnt been actually logged in for over a day.
> 
> I know you can telnet localhost a bunch of times to grab and use
> the tty the ghost in "w" is on, but with such a high one like
> "qk", it would take awhile.
> 
> Is there an easier way to get rid of a ghosted login in "w"?

Sure.  Compile (with libutil, using `gcc -o logout logout.c -lutil`)
and run (`./logout ttyqk`) the attached program.  It uses the
logout(3) function to clear the utmp entry for the specified tty.

-- 
Dima Dorfman <dima@unixfreak.org>
Finger dima@unixfreak.org for PGP public key.

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#include <sys/types.h>
#include <err.h>
#include <libutil.h>
#include <stdio.h>

int
main(int argc, char *argv[])
{

	if (argc < 2)
	{
		printf("Usage: %s <tty>\n", argv[0]);
		return (1);
	}

	if (logout(argv[1]) != 1)
		err(1, "logout");
	else
		printf("utmp entry for %s has been cleared\n", argv[1]);

	return (0);
}

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