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.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\"
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.\" $FreeBSD$
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.\"
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2004-06-22 20:18:15 +00:00
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.Dd June 22, 2004
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2001-07-13 18:35:48 +00:00
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.Dt DEVICE_IDS 9
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.Os
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.Sh NAME
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.Nm device_ids ,
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.Nm major ,
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.Nm minor ,
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.Nm umajor ,
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.Nm uminor
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.Nd "calculate device ids"
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/systm.h
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.Ft int
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.Fn major "struct cdev *dev"
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.Ft int
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.Fn minor "struct cdev *dev"
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.Ft int
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.Fn umajor "dev_t id"
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.Ft int
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.Fn uminor "dev_t id"
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.Sh DESCRIPTION
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The
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.Nm
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family of functions take either the raw device ID,
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.Fa id ,
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or a pointer to the device structure,
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.Fa dev ,
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and return the integer
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value that is the major or minor device ID as requested.
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.Pp
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The actual major and minor device IDs are values masked from of the raw device ID.
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For details on the actual calculations used to determine the major or minor IDs see
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the actual source in
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.Pa kern_conf.c .
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.Sh RETURN VALUES
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An integer greater than zero and less than
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.Dv NUMCDEVSW .
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.Fn major
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and
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.Fn minor
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will return
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.Dv NODEV
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if the device is invalid.
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.Sh AUTHORS
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2003-10-23 06:24:55 +00:00
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This manual page was written by
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2001-07-13 18:35:48 +00:00
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.An Chad David Aq davidc@acns.ab.ca .
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