man/man8/utmpd.8

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 Copyright 2015 Shruti V Sampat <shrutisampat@gmail.com>
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 UTMPD 8 "Feb 17, 2023"
 NAME
utmpd - utmpx monitoring daemon
 SYNOPSIS
utmpd [-debug]


 DESCRIPTION
The utmpd daemon monitors the /var/adm/utmpx file. See
utmpx(5) (and utmp(5) 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
terminated, 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
The values for these flags should be greater than 0. If values read
from the file are found to be less than or equal to 0, or containing
invalid characters, the default values mentioned below are retained.
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(8) 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 ALSO
 svcs (1),  poll (2),  pututxline (3C),  proc (5),  utmp (5),  utmpx (5),  attributes (7),  smf (7),  init (8),  svcadm (8)  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 occurred,
regardless of access time deferral or inhibition.

The utmpd service is managed by the service management facility,
smf(7), 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(8). The service's
status can be queried using the svcs(1) command.