UTMPD(1M)UTMPD(1M)NAMEutmpd - utmpx monitoring daemon
SYNOPSISutmpd [-debug]
DESCRIPTION
The utmpd daemon monitors the /var/adm/utmpx file. See utmpx(4) (and
utmp(4) for historical information).
utmpd receives requests from pututxline(3C) by way of a named pipe. It
maintains a table of processes and uses poll(2) on /proc files to
detect process termination. When utmpd detects that a process has ter‐
minated, it checks that the process has removed its utmpx entry from
/var/adm/utmpx. If the process' utmpx entry has not been removed, utmpd
removes the entry. By periodically scanning the /var/adm/utmpx file,
utmpd also monitors processes that are not in its table.
OPTIONS-debug
Run in debug mode, leaving the process connected to the controlling
terminal. Write debugging information to standard output.
EXIT STATUS
The following exit values are returned:
0
Successful completion.
>0
An error occurred.
FILES
/etc/default/utmpd
You can set default values for the flags listed below. For example:
SCAN_PERIOD=600
SCAN_PERIOD
The number of seconds that utmpd sleeps between checks of /proc
to see if monitored processes are still alive. The default is
300.
MAX_FDS
The maximum number of processes that utmpd attempts to monitor.
The default value is 4096.
WTMPX_UPDATE_FREQ
The number of seconds that utmpd sleeps between read accesses
of the wtmpx file. The wtmpx file's last access time is used by
init(1M) on reboot to determine when the operating system
became unavailable. The default is 60.
/var/adm/utmpx
File containing user and accounting information for commands such
as who(1), write(1), and login(1).
/proc
Directory containing files for processes whose utmpx entries are
being monitored.
SEE ALSOsvcs(1), init(1M), svcadm(1M), poll(2), pututxline(3C), proc(4),
utmp(4), utmpx(4), attributes(5), smf(5)NOTES
If the filesystem holding /var/adm/wtmpx is mounted with options which
inhibit or defer access time updates, an unknown amount of error will
be introduced into the utmp DOWN_TIME record's timestamp in the event
of an uncontrolled shutdown (for example, a crash or loss of power ).
Controlled shutdowns will update the modify time of /var/adm/wtmpx,
which will be used on the next boot to determine when the previous
shutdown ocurred, regardless of access time deferral or inhibition.
The utmpd service is managed by the service management facility,
smf(5), under the service identifier:
svc:/system/utmp:default
Administrative actions on this service, such as enabling, disabling, or
requesting restart, can be performed using svcadm(1M). The service's
status can be queried using the svcs(1) command.
Jun 4, 2008 UTMPD(1M)
