utmpx(5) BSD File Formats Manual utmpx(5)
NAME
utmpx -- user accounting database
SYNOPSIS
#include <utmpx.h>
DESCRIPTION
In contrast to utmp and wtmp, the extended databases in utmpx and wtmpx
reserve more space for logging hostnames, and also information on a
process' ID, termination signal and exit status.
The <utmpx.h> header defines the structures and functions for logging
user. Currently logged in users are tracked in /var/run/utmpx. The
interface to the utmpx file is described in endutxent(3). The file is
not automatically created if they do not exist; it must be created manu-
ally.
Traditionally, separate files would be used to store the running log of
the logins and logouts (wtmpx), and the last login of each user
(lastlogx). With the availability of the Apple system log facility
asl(3), these separate files can be replace with log entries, which are
automatically generated when utmpx entries are written. The API to
access the logins and logouts is described in endutxent_wtmp(3) while the
last login info is accessible with getlastlogx(3).
For compatibility, changes to utmpx are reflected in utmp(3) (in the
utmp, wtmp and lastlog files), but not the other way around.
FILES
/var/run/utmpx The utmpx file.
SEE ALSO
asl(3), endutxent(3), endutxent_wtmp(3), getlastlogx(3), utmp(5)
BSD January 31, 2007 BSD
Mac OS X 10.8 - Generated Sun Sep 2 08:46:33 CDT 2012