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SENSORSD(8) System Manager's Manual SENSORSD(8)

sensorsdhardware sensors monitor

sensorsd [-d] [-c check]

The sensorsd utility retrieves sensor monitoring data like fan speed, temperature, voltage and ami(4) logical disk status via sysctl(3). When the state of any monitored sensor changes, an alert is sent using syslog(3) and a command, if specified, is executed.

By default, sensorsd monitors status changes on all sensors that keep their state, thus sensors that automatically provide status do not require any additional configuration. In addition, for every sensor, no matter whether it automatically provides its state or not, custom low and high limits may be set, so that a local notion of sensor status can be computed by sensorsd, indicating whether the sensor is within or is exceeding its limits.

Limit and command values for a particular sensor may be specified in the sensorsd.conf(5) configuration file. This file is reloaded upon receiving SIGHUP.

The options are as follows:

Check sensors every check seconds. The shortest reporting period for state changes will be three times this value. The default is 20.
Do not daemonize. If this option is specified, sensorsd will run in the foreground.

Configuration file for sensorsd.

sysctl(3), syslog(3), sensorsd.conf(5), syslogd(8)

The sensorsd program first appeared in OpenBSD 3.5.

Certain sensors may flip status from time to time. To guard against false reports, sensorsd implements a state dumping mechanism. However, this inevitably introduces an additional delay in status reporting and command execution, e.g. one may notice that sensorsd makes its initial report about the state of monitored sensors not immediately, but about 60 seconds after it is started.

March 16, 2008 OpenBSD-5.1