Bye bye xntpd.

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-.\" $FreeBSD$
-.\"
-.Dd December 21, 1993
-.Dt TICKADJ 8
-.Os
-.Sh NAME
-.Nm tickadj
-.Nd fiddle time\-related variables in the kernel
-.Sh SYNOPSIS
-.Nm tickadj
-.Op Fl Adkpqs
-.Op Fl a Ar new_tickadj
-.Op Fl t Ar new_tick
-.Sh DESCRIPTION
-The
-.Nm
-program reads, and optionally modifies, several time\-keeping\-related
-variables in the running kernel, via
-.Pa /dev/kmem .
-The particular variables it is concerned with are
-.Em tick ,
-which is the number of microseconds added to the system time during a
-clock interrupt,
-.Em tickadj ,
-which sets the slew rate and resolution used by the
-.Xr adjtime 2
-system call, and
-.Em dosynctodr ,
-which indicates to the kernels on some machines whether they should internally
-adjust the system clock to keep it in line with time\-of\-day clock
-or not.
-.Pp
-By default, with no arguments,
-.Nm
-reads the variables of interest in the kernel and prints them.  At the
-same time it determines an
-.Qq optimal
-value for the value of the
-.Em tickadj
-variable if the intent is to run the
-.Xr xntpd 8
-Network Time Protocol daemon, and prints this as well.  Since the operation
-of
-.Nm
-when reading the kernel mimics the operation of similar parts of the
-.Xr xntpd 8
-program fairly closely, this is useful for doing debugging of problems
-with
-.Xr xntpd 8 Ns .
-.Pp
-Various flags may be specified to change the variables of interest in
-the running kernel:
-.Bl -tag -width indent
-.It Fl a Ar new_tickadj
-Allow one to set the variable
-.Em tickadj
-to the value specified as an argument.
-.It Fl A
-Cause
-.Em tickadj
-to be modified, but instead will set it to the internally computed
-.Qq optimal
-value.
-.It Fl d
-Add debugging information.
-.It Fl k
-Use
-.Pa /dev/kmem
-instead of
-.Pa /kernel .
-This is the default.
-.It Fl p
-Tell
-.Nm
-to set the value of the variable
-.Em noprintf
-to one.
-.It Fl q
-Tell
-.Nm
-to shut up about everything except errors. Normally
-.Nm
-is quite verbose about what it is doing.
-.It Fl s
-Tell
-.Nm
-to set the value of the variable
-.Em dosynctodr
-to zero, a prerequisite for running the
-.Xr xntpd 8
-daemon under SunOS 4.0.
-.It Fl t Ar new_tick
-May be used to reset the kernel's value of
-.Em tick ,
-a capability which is useful on machines with very broken clocks.
-.El
-.Pp
-Note that
-.Nm
-should be run with some caution when being used for the first time on
-different types of machines.  The operations which
-.Nm
-trys to perform are not guaranteed to work on all Unix machines.
-.Sh FILES
-.Bl -tag -width /dev/kmem -compact
-.It Pa /kernel
-.It Pa /dev/kmem
-.El
-.Sh SEE ALSO
-.Xr xntpd 8
-.Sh HISTORY
-Written by
-.An Dennis Ferguson
-at the University of Toronto.
-.Sh BUGS
-Fiddling with kernel variables at run time as a part of ordinary
-operations is a hideous practice which is only necessary to make
-up for deficiencies in the implementation of
-.Xr adjtime 2
-in many kernels and/or brokenness of the system clock in some
-vendors' kernels.  It would be much better if the kernels were fixed
-and the
-.Nm
-program went away.