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+.\"	$NetBSD: tvtohz.9,v 1.7 2014/03/18 18:20:40 riastradh Exp $
+.\"
+.\" Copyright (c) 2000 Kelly Yancey
+.\" 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.
+.\"
+.\" $FreeBSD: src/share/man/man9/tvtohz.9,v 1.4 2005/02/09 18:07:17 ru Exp $
+.\"
+.Dd October 20, 2011
+.Dt TVTOHZ 9
+.Os
+.Sh NAME
+.Nm tvtohz
+.Nd convert time interval to tick count
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft int
+.Fn tvtohz "struct timeval *tv"
+.Sh DESCRIPTION
+The
+.Fn tvtohz
+function accepts a single argument
+.Fa tv
+which specifies the time interval over which to calculate the number
+of system ticks that would elapse.
+.Sh RETURN VALUES
+Returns the integral number of system ticks expected to elapse in the given
+interval, including the current tick.
+.Sh SEE ALSO
+.Xr timeval 3 ,
+.Xr callout 9 ,
+.Xr microtime 9 ,
+.Xr microuptime 9 ,
+.Xr mstohz 9
+.Sh HISTORY
+The
+.Nm
+function first appeared in
+.Fx 3.0
+and was ported to
+.Nx 4.0
+as a part of
+.Xr timecounter 9
+framework.
+.Sh AUTHORS
+This manual page was written by
+.An Kelly Yancey Aq Mt kbyanc@posi.net .