.\" Copyright (c) 1998 Jonathan Lemon
.\" All rights reserved.
.\"
.\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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: i386_get_ioperm.2,v 1.1 1998/07/28 03:39:02 jlemon Exp $
.\"
.Dd July 27, 1998
.Os
.Dt I386_GET_IOPERM 2
.Sh NAME
.Nm i386_get_ioperm ,
.Nm i386_set_ioperm
.Nd manage per-process access to the i386 I/O port space
.Sh SYNOPSIS
.Fd #include <machine/sysarch.h>
.Ft int
.Fn i386_get_ioperm "unsigned int start" "unsigned int *length" "int *enable"
.Ft int
.Fn i386_set_ioperm "unsigned int start" "unsigned int length" "int enable"
.Sh DESCRIPTION
.Fn i386_get_ioperm
will return the permission for the process' I/O port space in the
.Fa *enable
argument.  The port range starts at
.Fa start
and the number of contiguous entries will be returned in
.Fa *length .
.Pp
.Fn i386_set_ioperm
will set access to a range of I/O ports described by the
.Fa start 
and 
.Fa length
arguments to the state specified by the
.Fa enable
argument.
.Sh RETURN VALUES
Upon successful completion,
.Fn i386_get_ioperm
and
.Fn i386_set_ioperm
return the value of 0.
Otherwise, a value of -1 is returned and the global
variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn i386_get_ioperm
and
.Fn i386_set_ioperm
will fail if:
.Bl -tag -width [EINVAL]
.It Bq Er EINVAL
An invalid range was specified by the  
.Fa start
or
.Fa length
arguments.
.It Bq Er EPERM
The caller of i386_set_ioperm was not the superuser.
.El
.Sh AUTHORS
This man page was written by
.An Jonathan Lemon .