utmpd - utmpx monitoring daemon
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.
Run in debug mode, leaving the process connected to the
controlling terminal. Write debugging information to standard output.
The following exit values are returned:
An error occurred.
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.
The number of seconds that utmpd sleeps between
checks of /proc to see if monitored processes are still alive. The
default is 300.
The maximum number of processes that utmpd
attempts to monitor. The default value is 4096.
The number of seconds that utmpd
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.
Directory containing files for processes whose
utmpx entries are being monitored.
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(5), under the service identifier:
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.