.\"	$OpenBSD: hotplugd.8,v 1.6 2007/05/31 19:20:24 jmc Exp $
.\"
.\" Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt HOTPLUGD 8
.Os
.Sh NAME
.Nm hotplugd
.Nd devices hot plugging monitor daemon
.Sh SYNOPSIS
.Nm hotplugd
.Op Fl d Ar device
.Sh DESCRIPTION
The
.Nm
daemon monitors the
.Xr hotplug 4
pseudo-device, acting on signaled events by executing the scripts in the
.Pa /etc/hotplug
directory.
By default it uses the
.Pa /dev/hotplug
device for reading events from, but an alternative device can be
specified with the
.Fl d
option.
.Pp
Actions can be configured either for device attachment or detachment.
On device attachment the
.Pa attach
script is executed if it exists.
On device detachment the
.Pa 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
.Aq Pa sys/device.h
header file and can be one of the following:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It 0
generic, no special info
.It 1
CPU (carries resource utilization)
.It 2
disk drive
.It 3
network interface
.It 4
tape device
.It 5
serial line interface
.El
.Pp
Not all classes are really usable.
For example, it's unlikely that a CPU will be hotplug.
.Pp
The device name is the usual name,
as listed in
.Xr MAKEDEV 8 ,
and the unit number, e.g.\&
.Pa sd1 .
.Sh FILES
.Bl -tag -width "/dev/hotplug/attach" -compact
.It /dev/hotplug
Pseudo-device file.
.It /etc/hotplug
Directory where the scripts to execute are located.
.It /etc/hotplug/attach
Script to execute on device attachment.
.It /etc/hotplug/detach
Script to execute on device detachment.
.El
.Sh EXAMPLES
Sample
.Pa attach
script:
.Bd -literal -offset indent
#!/bin/sh

DEVCLASS=$1
DEVNAME=$2

case $DEVCLASS in
2)
	# disk devices

	disklabel=`/sbin/disklabel $DEVNAME 2\*(Gt&1 | \e
		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

	/sbin/dhclient $DEVNAME

	;;
esac
.Ed
.Sh SEE ALSO
.Xr hotplug 4
.Sh HISTORY
The
.Nm
program first appeared in
.Ox 3.6 .
.Sh AUTHORS
The
.Nm
program was written by
.An Alexander Yurchenko Aq grange@openbsd.org .