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 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
utmpxfile.
SEE ALSO
asl(3), endutxent(3), endutxent_wtmp(3), getlastlogx(3), utmp(5)