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+.\" $NetBSD: utmpx.5,v 1.8 2010/03/22 18:58:32 joerg Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thomas Klausner.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd January 31, 2007
+.Dt UTMPX 5
+.Os
+.Sh NAME
+.Nm utmpx ,
+.Nm wtmpx ,
+.Nm lastlogx
+.Nd user accounting database
+.Sh SYNOPSIS
+.In utmpx.h
+.Sh DESCRIPTION
+In contrast to
+.Pa utmp
+and
+.Pa wtmp ,
+the extended databases in
+.Pa utmpx
+and
+.Pa wtmpx
+reserve more space for logging hostnames, and also
+information on a process' ID, termination signal and exit status.
+.Pp
+The
+.In utmpx.h
+header defines the structures and functions for logging user.
+Currently logged in users are tracked in
+.Pa /var/run/utmpx ,
+a list of all logins and logouts, as well as all shutdowns, reboots
+and date changes, is kept in
+.Pa /var/log/wtmpx ,
+and the last login of each user is noted in
+.Pa /var/log/lastlogx .
+.Pp
+The interface to the
+.Nm utmpx
+file is described in
+.Xr getutxent 3 .
+.Pp
+The
+.Nm wtmpx
+file can grow rapidly on busy systems, and is normally rotated with
+.Xr newsyslog 8 .
+.Pp
+In the event of a date change, a shutdown, or a reboot, the following
+items are logged in the
+.Nm wtmpx
+file:
+.Bl -tag -width shutdownxx -compact -offset indent
+.It Li date
+The system time has been manually or automatically updated by
+.Xr date 1 .
+The command name
+.Em date
+is recorded in the field
+.Fa ut_name .
+In the field
+.Fa ut_line ,
+the character
+.Ql \\*(Ba
+indicates the time prior to the change, and the character
+.Ql \&{
+indicates the new time.
+.It Li reboot
+.It Li shutdown
+A system reboot or shutdown has been initiated.
+The character
+.Ql \&~
+is placed in the field
+.Fa ut_line ,
+and
+.Li reboot
+or
+.Li shutdown
+in the field
+.Fa ut_name
+(see
+.Xr shutdown 8
+and
+.Xr reboot 8 ) ,
+using
+.Xr logwtmpx 3 .
+.Pp
+.El
+.Sh FILES
+.Bl -tag -width /var/log/lastlogx -compact
+.It Pa /var/run/utmpx
+The
+.Nm utmpx
+file.
+.It Pa /var/log/wtmpx
+The
+.Nm wtmpx
+file.
+.It Pa /var/log/lastlogx
+The
+.Nm lastlogx
+file.
+.El
+.Sh SEE ALSO
+.Xr last 1 ,
+.Xr login 1 ,
+.Xr rwho 1 ,
+.Xr w 1 ,
+.Xr who 1 ,
+.Xr endutxent 3 ,
+.Xr logwtmpx 3 ,
+.Xr utmp 5 ,
+.Xr ac 8 ,
+.Xr init 8 ,
+.Xr newsyslog 8 ,
+.Xr reboot 8