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+.\" $NetBSD: timeradd.3,v 1.10 2021/02/23 16:47:04 rillig Exp $
+.\"
+.\" Copyright (c) 2009 Jukka Ruohonen <jruohonen@iki.fi>
+.\" Copyright (c) 1999 Kelly Yancey <kbyanc@posi.net>
+.\" 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.
+.\" 3. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 REGENTS 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/man3/timeradd.3,v 1.3 2003/09/08 19:57:19 ru Exp $
+.\"
+.Dd June 7, 2010
+.Dt TIMERADD 3
+.Os
+.Sh NAME
+.Nm timeradd
+.Nd operations on time structure
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft void
+.Fn timeradd "struct timeval *a" "struct timeval *b" "struct timeval *res"
+.Ft void
+.Fn timersub "struct timeval *a" "struct timeval *b" "struct timeval *res"
+.Ft void
+.Fn timerclear "struct timeval *tv"
+.Ft int
+.Fn timerisset "struct timeval *tv"
+.Ft int
+.Fn timercmp "struct timeval *a" "struct timeval *b" CMP
+.Ft void
+.Fn timespecadd "struct timespec *a" \
+"struct timespec *b" "struct timespec *res"
+.Ft void
+.Fn timespecsub "struct timespec *a" \
+"struct timespec *b" "struct timespec *res"
+.Ft void
+.Fn timespecclear "struct timespec *ts"
+.Ft int
+.Fn timespecisset "struct timespec *ts"
+.Ft int
+.Fn timespeccmp "const struct timespec *a" "const struct timespec *b" CMP
+.Sh DESCRIPTION
+These macros are provided for manipulating the
+.Fa timeval
+and
+.Fa timespec
+structures described in
+.Xr timeval 3 .
+.Pp
+The
+.Fn timeradd
+and
+.Fn timespecadd
+macros add the time information stored in
+.Fa a
+to
+.Fa b ,
+storing the result in
+.Fa res .
+With
+.Fn timeradd
+the results are simplified such that the value of
+.Fa res->tv_usec
+is always less than 1,000,000 (1 second).
+With
+.Fn timespecadd
+the
+.Fa res->tv_nsec
+member of
+.Fa struct timespec
+is always less than 1,000,000,000.
+.Pp
+The
+.Fn timersub
+and
+.Fn timespecsub
+macros subtract the time information stored in
+.Fa b
+from
+.Fa a
+and store the resulting structure
+in
+.Fa res .
+.Pp
+The
+.Fn timerclear
+and
+.Fn timespecclear
+macros initialize the structures
+to midnight (0 hour) January 1st, 1970 (the Epoch).
+In other words, they set the members of the structure to zero.
+.Pp
+The
+.Fn timerisset
+and
+.Fn timespecisset
+macros return true if the input structure
+is set to any time value other than the Epoch.
+.Pp
+The
+.Fn timercmp
+and
+.Fn timespeccmp
+macros compare
+.Fa a
+to
+.Fa b
+using the comparison operator given in
+.Fa CMP .
+The result of the comparison is returned.
+.Sh SEE ALSO
+.Xr timeval 3
+.Sh HISTORY
+The
+.Fn timeradd
+family of macros first appeared in
+.Nx 1.1 .
+These were later ported to
+.Fx 2.2.6 .
+The
+.Fn timespec
+family of macros first appeared in
+.Nx 1.2 .