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utmpx(5) [osx man page]

UTMPX(5)						      BSD File Formats Manual							  UTMPX(5)

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 manually. 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

Check Out this Related Man Page

utmpx(4)							   File Formats 							  utmpx(4)

utmpx, wtmpx - utmpx and wtmpx database entry formats SYNOPSIS
#include <utmpx.h> /var/adm/utmpx /var/adm/wtmpx DESCRIPTION
The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files. The utmpx database contains user access and accounting information for commands such as who(1), write(1), and login(1). The wtmpx database contains the history of user access and accounting information for the utmpx database. USAGE
Applications should not access these databases directly, but should use the functions described on the getutxent(3C) manual page to inter- act with the utmpx and wtmpx databases to ensure that they are maintained consistently. FILES
/var/adm/utmpx user access and adminstration information /var/adm/wtmpx history of user access and adminstrative information SEE ALSO
getutxent(3C), wait(3C), wait.h(3HEAD) SunOS 5.11 6 Mar 2008 utmpx(4)

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