freebsd-dev/lib/libc/i386/sys/i386_get_ioperm.2

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1998-07-28 03:39:04 +00:00
.\" Copyright (c) 1998 Jonathan Lemon
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 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
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.\" $FreeBSD$
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.\"
.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 LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Fd #include <machine/sysarch.h>
.Ft int
.Fn i386_get_ioperm "unsigned int start" "unsigned int *length" "int *enable"
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.Ft int
.Fn i386_set_ioperm "unsigned int start" "unsigned int length" "int enable"
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.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 Er
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.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 .