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.\"
.\" $FreeBSD$
.\"
.Dd April 27, 2015
.Dt NTPTIME 8
.Os
.Sh NAME
.Nm ntptime
.Nd read kernel time variables
.Sh SYNOPSIS
.Nm
.Op Fl chr
.Op Fl e Ar est_error
.Op Fl f Ar frequency
.Op Fl m Ar max_error
.Op Fl o Ar offset
.Op Fl s Ar status
.Op Fl t Ar time_constant
.Sh DESCRIPTION
The
.Nm
utility is useful only with special kernels
described in the
.Qo
A Kernel Model for Precision Timekeeping
.Qc
page
(available as part of the HTML documentation
provided in
.Pa /usr/share/doc/ntp ) .
It reads and displays time-related kernel variables
using the
.Fn gettime
and
.Xr adjtime 2
system calls if available.
A similar display can be obtained using the
.Xr ntpdc 8
program's
.Ic kerninfo
command.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl c
Display the execution time of
.Nm
itself.
.It Fl e Ar est_error
Specify estimated error, in microseconds.
.It Fl f Ar frequency
Specify frequency offset, in parts per million.
.It Fl h
Display help information.
.It Fl m Ar max_error
Specify max possible errors, in microseconds.
.It Fl o Ar offset
Specify clock offset, in microseconds.
.It Fl r
Display Unix and NTP times in raw format.
.It Fl s Ar status
.It Fl t Ar time_constant
Specify time constant, an integer in the range 0-4.
.El
.Sh SEE ALSO
.Xr adjtime 2 ,
.Xr ntpdc 8
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