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+.\" $NetBSD: bintime_add.9,v 1.2 2010/06/08 07:20:20 wiz Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd June 8, 2010
+.Dt BINTIME_ADD 9
+.Os
+.Sh NAME
+.Nm bintime_add
+.Nd operations on
+.Dq bintime
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft vid
+.Fn bintime_add "struct bintime *bt" "const struct bintime *bt2"
+.Ft void
+.Fn bintime_addx "struct bintime *bt" "uint64_t x"
+.Ft void
+.Fn bintime_sub "struct bintime *bt" "const struct bintime *bt2"
+.Ft void
+.Fn bintime2timespec "const struct bintime *bt" "struct timespec *ts"
+.Ft void
+.Fn timespec2bintime "const struct timespec *ts" "struct bintime *bt"
+.Ft void
+.Fn bintime2timeval "const struct bintime *bt" "struct timeval *tv"
+.Ft void
+.Fn timeval2bintime "const struct timeval *tv" "struct bintime *bt"
+.Sh DESCRIPTION
+These functions are provided for convenience as part of the machine-independent
+.Xr timecounter 9
+framework.
+All of them operate with the
+.Em bintime
+structure.
+.Pp
+The function
+.Fn bintime_add
+adds the time information stored in
+.Fa bt2
+to
+.Fa bt .
+Conversely,
+.Fn bintime_sub
+subtracts
+.Fa bt2
+from
+.Fa bt .
+The
+.Fn bintime_addx
+function stores the fraction of a second
+.Fa x
+to
+.Fa bt .
+.Pp
+Like the function names bespeak,
+.Fn bintime2timespec
+converts the
+.Em bintime
+structure to
+.Em struct timespec
+and
+.Fn timespec2bintime
+does the opposite.
+The functions
+.Fn bintime2timeval
+and
+.Fn timeval2bintime
+operate with
+.Em struct timeval
+instead.
+The result is stored to the right-hand side.
+.Sh SEE ALSO
+.Xr timeradd 3 ,
+.Xr timeval 3 ,
+.Xr bintime 9 ,
+.Xr timecounter 9