04868d6a7b
- Abbreviated month name in .Dd - position of HISTORY section - alphabetical ordering within SEE ALSO section - adding .Ed before .Sh DESCRIPTION - remove trailing whitespaces - Line break after a sentence stop - Use BSD OS macros instead of hardcoded strings No .Dd bumps as there was no actual content change made in any of these pages. Submitted by: Gordon Bergling gbergling_gmail.com Approved by: bcr Differential Revision: https://reviews.freebsd.org/D24591
166 lines
4.1 KiB
Groff
166 lines
4.1 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 30, 2018
|
|
.Dt TIMERADD 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm timeradd ,
|
|
.Nm timersub ,
|
|
.Nm timerclear ,
|
|
.Nm timerisset ,
|
|
.Nm timercmp ,
|
|
.Nm timespecadd ,
|
|
.Nm timespecsub ,
|
|
.Nm timespecclear ,
|
|
.Nm timespecisset ,
|
|
.Nm timespeccmp
|
|
.Nd operations on timevals and timespecs
|
|
.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 *tvp"
|
|
.Ft int
|
|
.Fn timerisset "struct timeval *tvp"
|
|
.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 "struct timespec *a" "struct timespec *b" CMP
|
|
.Sh DESCRIPTION
|
|
These macros are provided for manipulating
|
|
.Fa timeval
|
|
and
|
|
.Fa timespec
|
|
structures for use with the
|
|
.Xr clock_gettime 2 ,
|
|
.Xr clock_settime 2 ,
|
|
.Xr gettimeofday 2
|
|
and
|
|
.Xr settimeofday 2
|
|
calls.
|
|
The
|
|
.Fa timeval
|
|
structure is defined in
|
|
.In sys/time.h
|
|
as:
|
|
.Bd -literal
|
|
struct timeval {
|
|
long tv_sec; /* seconds since Jan. 1, 1970 */
|
|
long tv_usec; /* and microseconds */
|
|
};
|
|
.Ed
|
|
And the
|
|
.Fa timespec
|
|
structure is defined in
|
|
.In time.h
|
|
as:
|
|
.Bd -literal
|
|
struct timespec {
|
|
time_t tv_sec; /* seconds */
|
|
long tv_nsec; /* and nanoseconds */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
.Fn timeradd
|
|
and
|
|
.Fn timespecadd
|
|
add the time information stored in
|
|
.Fa a
|
|
to
|
|
.Fa b
|
|
and store the result in
|
|
.Fa res .
|
|
The results are simplified such that the value of
|
|
.Fa res->tv_usec
|
|
or
|
|
.Fa res->tv_nsec
|
|
is always less than 1 second.
|
|
.Pp
|
|
.Fn timersub
|
|
and
|
|
.Fn timespecsub
|
|
subtract the time information stored in
|
|
.Fa b
|
|
from
|
|
.Fa a
|
|
and store the result
|
|
in
|
|
.Fa res .
|
|
.Pp
|
|
.Fn timerclear
|
|
and
|
|
.Fn timespecclear
|
|
initialize their argument to midnight (0 hour) January 1st, 1970 (the Epoch).
|
|
.Pp
|
|
.Fn timerisset
|
|
and
|
|
.Fn timespecisset
|
|
return true if their argument is set to any time value other than the Epoch.
|
|
.Pp
|
|
.Fn timercmp
|
|
and
|
|
.Fn timespeccmp
|
|
compare
|
|
.Fa a
|
|
to
|
|
.Fa b
|
|
using the comparison operator given in
|
|
.Fa CMP ,
|
|
and return the result of that comparison.
|
|
.Sh SEE ALSO
|
|
.Xr clock_gettime 2 ,
|
|
.Xr gettimeofday 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn timeradd
|
|
family of macros were imported from
|
|
.Nx 1.1 ,
|
|
and appeared in
|
|
.Fx 2.2.6 .
|
|
The
|
|
.Fn timespecadd
|
|
family of macros were imported from
|
|
.Nx 1.3
|
|
into
|
|
.Fx 3.0 ,
|
|
though they were not exposed to userland until
|
|
.Fx 12.0 .
|