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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 1998 Doug Rabson
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 16, 1998
+.Dt DEVICE_GET_STATE 9
+.Os
+.Sh NAME
+.Nm device_get_state ,
+.Nm device_busy ,
+.Nm device_unbusy ,
+.Nm device_is_alive ,
+.Nm device_is_attached
+.Nd manipulate device state
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/bus.h
+.Ft device_state_t
+.Fn device_get_state "device_t dev"
+.Ft void
+.Fn device_busy "device_t dev"
+.Ft void
+.Fn device_unbusy "device_t dev"
+.Ft int
+.Fn device_is_alive "device_t dev"
+.Ft int
+.Fn device_is_attached "device_t dev"
+.Sh DESCRIPTION
+The current state of a device is accessed by calling
+.Fn device_get_state
+which returns
+.Dv DS_NOTPRESENT ,
+.Dv DS_ALIVE ,
+.Dv DS_ATTACHED
+or
+.Dv DS_BUSY
+(described in
+.Xr device 9 ) .
+To test see if a device was successfully probed, call
+.Fn device_is_alive
+which simply returns if the state is greater or equal to
+.Dv DS_ALIVE .
+To test see if a device was successfully attached, call
+.Fn device_is_attached
+which simply returns if the state is greater or equal to
+.Dv DS_ATTACHED .
+.Pp
+Each device has a busy count which is incremented when
+.Fn device_busy
+is called and decremented when
+.Fn device_unbusy
+is called.
+Both routines return an error if the device state is less than
+.Dv DS_ATTACHED .
+.Pp
+When
+.Fn device_busy
+is called on a device in the
+.Dv DS_ATTACHED
+state, the device changes to the
+.Dv DS_BUSY
+state.
+When
+.Fn device_unbusy
+is called and after decrementing, the busy count for the device is
+zero, the device changes to the
+.Dv DS_ATTACHED
+state.
+.Sh SEE ALSO
+.Xr device 9
+.Sh AUTHORS
+This manual page was written by
+.An Doug Rabson .