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    <title>s6-networking: the s6-clockadd program</title>
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<a href="index.html">s6-networking</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
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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>&nbsp;: 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&nbsp;<em>errmax</em></tt>&nbsp;: 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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