1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 1998 Doug Rabson 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd June 16, 1998 32.Dt DEVCLASS 9 33.Os 34.Sh NAME 35.Nm devclass 36.Nd object representing a class of devices 37.Sh SYNOPSIS 38.Vt typedef struct devclass *devclass_t ; 39.Sh DESCRIPTION 40The 41.Vt devclass 42object has two main functions in the system. 43The first is to manage 44the allocation of unit numbers for device instances and the second is 45to hold the list of device drivers for a particular bus type. 46Each 47.Vt devclass 48has a name and there cannot be two devclasses with the same name. 49This ensures that unique unit numbers are allocated to device 50instances. 51.Pp 52Beware that this means 53.Vt devclass 54must be the same for different bus attachments of the same device driver. 55.Sh SEE ALSO 56.Xr devclass_add_driver 9 , 57.Xr devclass_delete_driver 9 , 58.Xr devclass_find 9 , 59.Xr devclass_find_driver 9 , 60.Xr devclass_get_device 9 , 61.Xr devclass_get_devices 9 , 62.Xr devclass_get_maxunit 9 , 63.Xr devclass_get_name 9 , 64.Xr devclass_get_softc 9 , 65.Xr device 9 , 66.Xr driver 9 67.Sh AUTHORS 68This manual page was written by 69.An Doug Rabson . 70