b09403abf8
Differential Revision: https://reviews.freebsd.org/D2358 Submitted by: gnn@ Approved by: wblock (mentor) MFC after: after 1 week
68 lines
1.3 KiB
Groff
68 lines
1.3 KiB
Groff
.\"
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.\" $FreeBSD$
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.\"
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.Dd April 27, 2015
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.Dt NTPTIME 8
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.Os
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.Sh NAME
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.Nm ntptime
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.Nd read kernel time variables
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.Sh SYNOPSIS
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.Nm
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.Op Fl chr
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.Op Fl e Ar est_error
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.Op Fl f Ar frequency
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.Op Fl m Ar max_error
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.Op Fl o Ar offset
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.Op Fl s Ar status
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.Op Fl t Ar time_constant
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.Sh DESCRIPTION
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The
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.Nm
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utility is useful only with special kernels
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described in the
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.Qo
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A Kernel Model for Precision Timekeeping
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.Qc
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page
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(available as part of the HTML documentation
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provided in
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.Pa /usr/share/doc/ntp ) .
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It reads and displays time-related kernel variables
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using the
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.Fn gettime
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and
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.Xr adjtime 2
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system calls if available.
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A similar display can be obtained using the
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.Xr ntpdc 8
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program's
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.Ic kerninfo
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command.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl c
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Display the execution time of
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.Nm
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itself.
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.It Fl e Ar est_error
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Specify estimated error, in microseconds.
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.It Fl f Ar frequency
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Specify frequency offset, in parts per million.
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.It Fl h
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Display help information.
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.It Fl m Ar max_error
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Specify max possible errors, in microseconds.
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.It Fl o Ar offset
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Specify clock offset, in microseconds.
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.It Fl r
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Display Unix and NTP times in raw format.
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.It Fl s Ar status
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.It Fl t Ar time_constant
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Specify time constant, an integer in the range 0-4.
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.El
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.Sh SEE ALSO
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.Xr adjtime 2 ,
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.Xr ntpdc 8
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