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+.\" $NetBSD: io.4,v 1.4 2002/01/15 01:42:01 wiz Exp $
+.\"
+.\" Copyright (c) 1996 Joerg Wunsch
+.\"
+.\" 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: src/share/man/man4/man4.i386/io.4,v 1.6.2.2 2000/12/12 10:00:55 ru Exp $
+.\"
+.Dd January 1, 1996
+.Dt IO 4 i386
+.Os
+.Sh NAME
+.Nm io
+.Nd I/O privilege file
+.Sh DESCRIPTION
+.Bf -symbolic
+This device is obsolete and is provided for compatibility purposes
+only; use
+.Xr i386_iopl 2
+instead.
+.Ef
+.Pp
+After opening
+.Pa /dev/io
+for writing
+the process is granted full I/O privileges; closing the returned file
+descriptor does
+.Em not
+result in revocation of these privileges.
+The new I/O privileges can be useful in order to write userland
+programs that handle some hardware directly.
+.Pp
+The entire access control is handled by the file access permissions
+of
+.Pa /dev/io ,
+so care should be taken in granting rights for this device.
+.Pp
+I/O privilege on access to
+.Pa /dev/io
+is only granted if the kernel was built with the
+.Dv COMPAT_10
+option.
+.Sh FILES
+.Bl -tag -width Pa -compact
+.It Pa /dev/io
+.El
+.Sh SEE ALSO
+.Xr mem 4
+.Sh HISTORY
+The
+.Nm
+file appeared in
+.Nx 1.0
+after it was in the kernel for some time.