hotplugd(8) - Manual pages

NAME

hotplugd — devices hot plugging monitor daemon

DESCRIPTION

The hotplugd daemon uses devattr(3) acting on signaled events by executing the scripts in the /etc/hotplug directory.

Actions can be configured either for device attachment or detachment. On device attachment the attach script is executed if it exists. On device detachment the detach script is executed if it exists. In both cases two parameters are passed to the scripts: the class and name of the attached or detached device. The device class corresponds to the classes described in the <sys/device.h> header file and can be one of the following:

0: generic, no special info
1: CPU (carries resource utilization)
2: disk drive
3: network interface
4: tape device
5: serial line interface

Not all classes are really usable. For example, it's unlikely that a CPU will be hotplugged.

The device name is the usual name, as found in /dev, e.g. da1.

FILES

/dev/hotplug: Pseudo-device file.
/etc/hotplug: Directory where the scripts to execute are located.
/etc/hotplug/attach: Script to execute on device attachment.
/etc/hotplug/detach: Script to execute on device detachment.

EXAMPLES

Sample attach script:

#!/bin/sh

DEVCLASS=$1
DEVNAME=$2

case $DEVCLASS in
2)
	# disk devices
	disklabel=`/sbin/disklabel $DEVNAME 2>&1 | \
	    sed -n '/^label: /s/^label: //p'`
	case $disklabel in
	Sony*DSC*)
		# Sony DSC camera
		mount -o nodev,nosuid /dev/"$DEVNAME"i /mnt/camera
		;;
	esac
	;;
3)
	# network devices; requires hostname.$DEVNAME
	sh /etc/netstart $DEVNAME
	;;
esac

HISTORY

The hotplugd program first appeared in OpenBSD 3.6.

The hotplugd program was adapted to use devattr(3) in DragonFly 2.9.

AUTHORS

The hotplugd program was written by Alexander Yurchenko <grange@openbsd.org>.

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