60 lines
1.6 KiB
Groff
60 lines
1.6 KiB
Groff
.Dd Aug 1, 2017
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.Dt ADJTIMEX 1
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.Sh NAME
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.Nm adjtimex
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.Nd access to kernel time controls and readouts
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.Sh SYNOPSIS
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.Nm
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.Op Fl q
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.Op Fl o Ar offset
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.Op Fl f Ar freq
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.Op Fl p Ar pll-time-constant
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.Sh DESCRIPTION
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.Nm
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reads and optionally sets adjustment parameters for the Linux system
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clock. This program provides shell-level access to the system call
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.Xr adjtimex 2 ,
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which actually manipulates the
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.Nm timex
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structure. All parameters are left alone unless asked to change with
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the corresponding option. By default, the values of the
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.Nm timex
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structure on return from
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.Xr adjtimex 2
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are printed, along with helpful hints about what
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.Nm
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switches control them.
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.Pp
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Mortal users may view all these parameters; only the superuser may
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change them.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl q
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quiet mode, do not print anything
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.It Fl o Ar offset
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Time offset in microseconds.
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.It Fl -f Ar freq
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Frequency adjust, in integer kernel units (65536 units is one
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part-per-million). Positive values make the system clock run fast.
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.It Fl t Ar tick
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Microseconds per tick, nominally 10000. Coarse corrections (within 100
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ppm) to clock frequency are better made here than with
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.Fl f .
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.It Fl p Ar pll-time-constant
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Rate
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.El
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.Sh SEE ALSO
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.Xr adjtimex 2 ,
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.Xr tickadj 1 ,
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.Xr /usr/include/linux/timex.h
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.Pp
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An independent implementation of similar functionality was
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written by Steven Dick and Jim Van Zandt, see
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.Lk http://www.ibiblio.org/pub/Linux/system/admin/time/adjtimex.lsm
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.Sh BUGS
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Every writable member of the
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.Nm timex
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structure should be settable from this program.
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.Sh AUTHOR
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Larry Doolittle <larry@doolittle.boa.org>
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