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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.
+.\"
+.\" $Id$
+.\"
+.Dd June 16, 1998
+.Dt devclass 9
+.Os FreeBSD
+.Sh NAME
+.Nm devclass
+.Nd object representing a class of devices
+.Sh SYNOPSYS
+.Dv typedef struct devclass *devclass_t;
+.Sh DESCRIPTION
+.Pp
+The
+.Dv devclass
+object has two main functions in the system.  The first is to manage
+the allocation of unit numbers for device instances and the second is
+to hold the list of device drivers for a particular bus type.
+Each
+.Dv devclass
+has a name and there cannot be two devclasses with the same name.
+This ensures that unique unit numbers are allocated to device
+instances.
+.Sh SEE ALSO
+.Xr device 9 ,
+.Xr driver 9 ,
+.Xr devclass_find 9 ,
+.Xr devclass_add_driver 9 ,
+.Xr devclass_delete_driver 9 ,
+.Xr devclass_find_driver 9 ,
+.Xr devclass_get_name 9 ,
+.Xr devclass_get_device 9 ,
+.Xr devclass_get_softc 9 ,
+.Xr devclass_get_devices 9 ,
+.Xr devclass_get_maxunit 9
+.Sh AUTHORS
+This man page was written by
+.An Doug Rabson .