| UTMPX(5) | File Formats Manual | UTMPX(5) |
utmpx — user
accounting database
#include
<utmpx.h>
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.
utmpx file.asl(3), endutxent(3), endutxent_wtmp(3), getlastlogx(3), utmp(5)
| January 31, 2007 | Mac OS X 12 |