.\" Copyright (c) 1998 Jonathan Lemon
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.\" $FreeBSD: head/lib/libc/i386/sys/i386_get_ioperm.2 233520 2012-03-26 19:23:57Z joel $
.\"
.Dd July 27, 1998
.Dt I386_GET_IOPERM 2
.Os
.Sh NAME
.Nm i386_get_ioperm ,
.Nm i386_set_ioperm
.Nd manage per-process access to the i386 I/O port space
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In 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
The
.Fn i386_get_ioperm
system call
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
The
.Fn i386_set_ioperm
system call
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
.Rv -std
.Sh ERRORS
The
.Fn i386_get_ioperm
and
.Fn i386_set_ioperm
system calls
will fail if:
.Bl -tag -width Er
.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 SEE ALSO
.Xr io 4
.Sh AUTHORS
This man page was written by
.An Jonathan Lemon .