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<title>s6-networking: the s6-clockadd program</title>
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<meta name="Keywords" content="s6-networking s6-clockadd tai clock tai64 tai64n tai64na clockadd setting the system clock" />
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<p>
<a href="index.html">s6-networking</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-clockadd</tt> program </h1>
<p>
<tt>s6-clockadd</tt> adjusts the system clock depending on the input
provided by a time client.
</p>
<h2> Interface </h2>
<pre>
s6-taiclock <em>server</em> | s6-clockadd [ -f ] [ -e <em>errmax</em> ]
</pre>
<ul>
<li> s6-clockadd reads its stdin, expecting input from a program such
<a href="s6-taiclock.html">s6-taiclock</a> or
<a href="s6-sntpclock.html">s6-sntpclock</a> (which get time from a
time server). </li>
<li> It sets the system clock so the system time becomes the one
given by the server. Then it exits 0. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-f</tt> : force. Normally, s6-clockadd exits 1 if the
time discrepancy read from stdin is bigger than <em>errmax</em>
milliseconds. If this
option is set, it will print a warning message, but still set the
system time and exit 0. </li>
<li> <tt>-e <em>errmax</em></tt> : accept a maximum time
discrepancy of <em>errmax</em> milliseconds. By default, <em>errmax</em>
is 2000. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> s6-clockadd must be run as root. The client getting the time
from a time server, however, does not have to. </li>
</ul>
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