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.\" $OpenBSD: timeradd.3,v 1.3 2019/05/10 19:14:12 cheloha Exp $
.\" $NetBSD: getitimer.2,v 1.6 1995/10/12 15:40:54 jtc Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. 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 University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
.\"
.\" @(#)getitimer.2 8.2 (Berkeley) 12/11/93
.\"
.Dd $Mdocdate: May 10 2019 $
.Dt TIMERADD 3
.Os
.Sh NAME
.Nm timerclear ,
.Nm timerisset ,
.Nm timerisvalid ,
.Nm timercmp ,
.Nm timersub ,
.Nm timeradd ,
.Nm timespecclear ,
.Nm timespecisset ,
.Nm timespecisvalid ,
.Nm timespeccmp ,
.Nm timespecsub ,
.Nm timespecadd ,
.Nm TIMEVAL_TO_TIMESPEC ,
.Nm TIMESPEC_TO_TIMEVAL
.Nd manipulate time structures
.Sh SYNOPSIS
.In sys/time.h
.Ft void
.Fn timerclear "struct timeval *a"
.Ft int
.Fn timerisset "struct timeval *a"
.Ft int
.Fn timerisvalid "struct timeval *a"
.Ft int
.Fn timercmp "struct timeval *a" "struct timeval *b" operator
.Ft void
.Fn timersub "struct timeval *a" "struct timeval *b" "struct timeval *c"
.Ft void
.Fn timeradd "struct timeval *a" "struct timeval *b" "struct timeval *c"
.Ft void
.Fn timespecclear "struct timespec *a"
.Ft int
.Fn timespecisset "struct timespec *a"
.Ft int
.Fn timespecisvalid "struct timespec *a"
.Ft int
.Fn timespeccmp "struct timespec *a" "struct timespec *b" operator
.Ft void
.Fn timespecsub "struct timespec *a" "struct timespec *b" "struct timespec *c"
.Ft void
.Fn timespecadd "struct timespec *a" "struct timespec *b" "struct timespec *c"
.Ft void
.Fn TIMEVAL_TO_TIMESPEC "struct timeval *tv" "struct timespec *ts"
.Ft void
.Fn TIMESPEC_TO_TIMEVAL "struct timeval *tv" "struct timespec *ts"
.Sh DESCRIPTION
The
.Fn timer*
and
.Fn timespec*
macros defined in
.In sys/time.h
simplify the use of
.Vt timeval
and
.Vt timespec
structures,
respectively.
.Pp
The following macros are available:
.Bl -tag -width Ds
.It Fn timerclear a , Fn timespecclear a
Set the time value in
.Fa a
to zero.
.It Fn timerisset a , Fn timespecisset a
Test if the time value in
.Fa a
is non-zero.
.It Fn timerisvalid a
Test if the microsecond value in
.Fa a
is greater than or equal to zero and less than one million.
.It Fn timespecisvalid a
Test if the nanosecond value in
.Fa a
is greater than or equal to zero and less than one billion.
.It Fn timercmp a b operator , Fn timespeccmp a b operator
Test if the expression
.Fa a operator b
is true,
where
.Fa operator
is one of
.Cm < ,
.Cm <= ,
.Cm == ,
.Cm != ,
.Cm >= ,
or
.Cm > .
.It Fn timersub a b c , Fn timespecsub a b c
Subtract
.Fa b
from
.Fa a
and store the result in
.Fa c .
.It Fn timeradd a b c , Fn timespecadd a b c
Add
.Fa b
to
.Fa a
and store the result in
.Fa c .
.It Fn TIMEVAL_TO_TIMESPEC tv ts
Convert
.Fa tv
to a
.Vt struct timespec
and store the result in
.Fa ts .
.It Fn TIMESPEC_TO_TIMEVAL tv ts
Convert
.Fa ts
to a
.Vt struct timeval
and store the result in
.Fa tv .
.El
.Sh RETURN VALUES
The macros returning
.Vt int
return 1 if the tested condition holds or 0 otherwise.
.Sh SEE ALSO
.Xr adjtime 2 ,
.Xr clock_gettime 2 ,
.Xr futex 2 ,
.Xr futimens 2 ,
.Xr futimes 2 ,
.Xr getitimer 2 ,
.Xr gettimeofday 2 ,
.Xr kevent 2 ,
.Xr nanosleep 2 ,
.Xr ppoll 2 ,
.Xr pselect 2
.Sh STANDARDS
These macros are non-standard,
though many systems offer them.
Similar interfaces are often available in their absence.
.Sh HISTORY
The macros
.Fn timerclear ,
.Fn timerisset ,
and
.Fn timercmp
first appeared in
.Bx 4.1c ,
.Fn TIMEVAL_TO_TIMESPEC
and
.Fn TIMESPEC_TO_TIMEVAL
in
.Bx 4.4 ,
.Fn timersub
and
.Fn timeradd
in
.Nx 1.1 ,
and
.Fn timerisvalid
in
.Ox 6.5 .
.Sh CAVEATS
The argument ordering for
.Fn TIMESPEC_TO_TIMEVAL
is unintuitive.
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