.\"	$NetBSD: getlabelsector.3,v 1.8 2011/09/14 11:43:29 njoly Exp $
.\"
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.Dd August 25, 2011
.Dt GETLABELSECTOR 3
.Os
.Sh NAME
.Nm getlabelsector ,
.Nm getlabeloffset ,
.Nm getlabelusesmbr
.Nd get disklabel location informations
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In util.h
.Ft daddr_t
.Fn getlabelsector void
.Ft off_t
.Fn getlabeloffset void
.Ft int
.Fn getlabelusesmbr void
.Sh DESCRIPTION
The
.Fn getlabelsector
and
.Fn getlabeloffset
functions return values which describe the exact on-disk location of the
.Xr disklabel 5
on the current system, or \-1 on error.
These functions supersede the hardcoded
.Dv LABELSECTOR
and
.Dv LABELOFFSET
definitions previously used to derive the location of the
.Xr disklabel 5 .
.Pp
The
.Fn getlabelusesmbr
returns 1 if the disklabel is located inside a MBR partition, 0 if it's stored
relative to the start of the disk, or \-1 on error.
.Sh SEE ALSO
.Xr sysctl 3 ,
.Xr disklabel 5
.Sh HISTORY
The
.Fn getlabelsector
and
.Fn getlabeloffset
functions appeared in
.Nx 2.0 .