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<title>ntptime - read kernel time variables</title>
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<h3><tt>ntptime</tt> - read kernel time variables</h3>
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<img align="left" src="pic/pogo5.gif" alt="gif"><a href=
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"http://www.eecis.udel.edu/~mills/pictures.htm">from <i>Pogo</i>,
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Walt Kelly</a>
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1999-12-09 13:01:21 +00:00
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2001-08-29 14:35:15 +00:00
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<p>The turtle is been swimming in the kernel.<br clear="left">
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</p>
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<hr>
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<h4>Synopsis</h4>
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<tt>ntptime [ -chr ] [ -e <i>est_error</i> ] [ -f <i>frequency</i>
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] [ -m <i>max_error</i> ] [ -o <i>offset</i> ] [ -s <i>status</i> ]
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[ -t <i>time_constant</i>]</tt>
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<h4>Description</h4>
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This program is useful only with special kernels described in the
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<a href="kern.htm">A Kernel Model for Precision Timekeeping</a>
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page. It reads and displays time-related kernel variables using the
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<tt>ntp_gettime()</tt> system call. A similar display can be
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obtained using the <tt>ntpdc</tt> program and <tt>kerninfo</tt>
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command.
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<h4>Options</h4>
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<dl>
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<dt><tt>-c</tt></dt>
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<dd>Display the execution time of <tt>ntptime</tt> itself.</dd>
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<dt><tt>-e <i>est_error</i></tt></dt>
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<dd>Specify estimated error, in microseconds.</dd>
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<dt><tt>-f <i>frequency</i></tt></dt>
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<dd>Specify frequency offset, in parts per million.</dd>
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<dt><tt>-h</tt></dt>
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<dd>Display help information.</dd>
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<dt><tt>-m <i>max_error</i></tt></dt>
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<dd>Specify max possible errors, in microseconds.</dd>
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<dt><tt>-o <i>offset</i></tt></dt>
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<dd>Specify clock offset, in microseconds.</dd>
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<dt><tt>-r</tt></dt>
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<dd>Display Unix and NTP times in raw format.</dd>
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<dt><tt>-s <i>status</i></tt></dt>
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<dd>Specify clock status. Better know what you are doing.</dd>
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<dt><tt>-t <i>time_constant</i></tt></dt>
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<dd>Specify time constant, an integer in the range 0-10.</dd>
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</dl>
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<hr>
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<a href="index.htm"><img align="left" src="pic/home.gif" alt=
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"gif"></a>
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<address><a href="mailto:mills@udel.edu">David L. Mills
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<mills@udel.edu></a></address>
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</body>
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</html>
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