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 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.

-debug

Run in debug mode, leaving the process connected to the controlling terminal. Write debugging information to standard output.

The following exit values are returned:

0

Successful completion.

>0

An error occurred.

/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.

/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 attributes(5) for descriptions of the following attributes:

poll(2), pututxline(3C), proc(4), utmp(4), utmpx(4), attributes(5)