config root man

.\"	$NetBSD: fetch.9,v 1.2 1996/01/09 21:59:24 perry Exp $
.\"
.\" Copyright (c) 1996 Jason R. Thorpe.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed by Kenneth Stailey.
.\"
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed for the NetBSD Project
.\"	by Jason R. Thorpe.
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission.
.\"
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.\" $FreeBSD: release/9.1.0/share/man/man9/fetch.9 197780 2009-10-05 15:16:28Z trasz $
.\"
.Dd October 5, 2009
.Dt FETCH 9
.Os
.Sh NAME
.Nm fetch ,
.Nm fubyte ,
.Nm fuswintr ,
.Nm fuword ,
.Nm fuword16 ,
.Nm fuword32 ,
.Nm fuword64
.Nd fetch data from user-space
.Sh SYNOPSIS
.In sys/types.h
.In sys/time.h
.In sys/systm.h
.Ft int
.Fn fubyte "const void *base"
.Ft long
.Fn fuword "const void *base"
.Ft int
.Fn fuword16 "void *base"
.Ft int32_t
.Fn fuword32 "const void *base"
.Ft int64_t
.Fn fuword64 "const void *base"
.In sys/resourcevar.h
.Ft int
.Fn fuswintr "void *base"
.Sh DESCRIPTION
The
.Nm
functions are designed to copy small amounts of data from user-space.
.Pp
The
.Nm
routines provide the following functionality:
.Bl -tag -width "fuswintr()"
.It Fn fubyte
Fetches a byte of data from the user-space address
.Pa base .
.It Fn fuword
Fetches a word of data from the user-space address
.Pa base .
.It Fn fuword16
Fetches 16 bits of data from the user-space address
.Pa base .
.It Fn fuword32
Fetches 32 bits of data from the user-space address
.Pa base .
.It Fn fuword64
Fetches 64 bits of data from the user-space address
.Pa base .
.It Fn fuswintr
Fetches a short word of data from the user-space address
.Pa base .
This function is safe to call during an interrupt context.
.El
.Sh RETURN VALUES
The
.Nm
functions return the data fetched or -1 on failure.
.Sh SEE ALSO
.Xr copy 9 ,
.Xr store 9