70 lines
2.4 KiB
Groff
70 lines
2.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1998 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 16, 1998
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.Dt DEVCLASS 9
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.Os FreeBSD
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.Sh NAME
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.Nm devclass
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.Nd object representing a class of devices
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.Sh SYNOPSIS
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.Dv typedef struct devclass *devclass_t;
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.Sh DESCRIPTION
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.Pp
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The
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.Dv devclass
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object has two main functions in the system. The first is to manage
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the allocation of unit numbers for device instances and the second is
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to hold the list of device drivers for a particular bus type.
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Each
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.Dv devclass
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has a name and there cannot be two devclasses with the same name.
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This ensures that unique unit numbers are allocated to device
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instances.
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.Pp
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Beware that this means
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.Dv devclass
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must be the same for different bus attachments of the same device driver.
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.Sh SEE ALSO
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.Xr devclass_add_driver 9 ,
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.Xr devclass_delete_driver 9 ,
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.Xr devclass_find 9 ,
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.Xr devclass_find_driver 9 ,
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.Xr devclass_get_device 9 ,
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.Xr devclass_get_devices 9 ,
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.Xr devclass_get_maxunit 9 ,
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.Xr devclass_get_name 9 ,
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.Xr devclass_get_softc 9 ,
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.Xr device 9 ,
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.Xr driver 9
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.Sh AUTHORS
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This man page was written by
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.An Doug Rabson .
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