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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>binfmt.d</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="binfmt.d"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>binfmt.d — Configure additional binary formats for
executables at boot</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/etc/binfmt.d/*.conf</code></p><p><code class="filename">/run/binfmt.d/*.conf</code></p><p><code class="filename">/usr/lib/binfmt.d/*.conf</code></p></div><div class="refsect1"><a name="idm214170142016"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>At boot,
<a href="systemd-binfmt.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-binfmt.service</span>(8)</span></a>
reads configuration files from the above directories
to register in the kernel additional binary
formats for executables.</p></div><div class="refsect1"><a name="idm214172795840"></a><h2 id="Configuration Format">Configuration Format<a class="headerlink" title="Permalink to this headline" href="#Configuration%20Format">¶</a></h2><p>Each file contains a list of binfmt_misc kernel
binary format rules. Consult <a class="ulink" href="https://www.kernel.org/doc/Documentation/binfmt_misc.txt" target="_top">binfmt_misc.txt</a>
for more information on registration of additional
binary formats and how to write rules.</p><p>Empty lines and lines beginning with ; and # are
ignored. Note that this means you may not use ; and #
as delimiter in binary format rules.</p><p>Each configuration file shall be named in the
style of <code class="filename"><em class="replaceable"><code>program</code></em>.conf</code>.
Files in <code class="filename">/etc/</code> override files
with the same name in <code class="filename">/usr/lib/</code>
and <code class="filename">/run/</code>. Files in
<code class="filename">/run/</code> override files with the
same name in <code class="filename">/usr/lib/</code>. Packages
should install their configuration files in
<code class="filename">/usr/lib/</code>, files in
<code class="filename">/etc/</code> are reserved for the local
administrator, who may use this logic to override the
configuration files installed from vendor
packages. All files are sorted by their filename in
lexicographic order, regardless of which of the
directories they reside in. If multiple files specify
the same binary type name, the entry in the file with
the lexicographically latest name will be applied.</p><p>If the administrator wants to disable a
configuration file supplied by the vendor, the
recommended way is to place a symlink to
<code class="filename">/dev/null</code> in
<code class="filename">/etc/binfmt.d/</code> bearing the
same filename.</p></div><div class="refsect1"><a name="idm214169046960"></a><h2 id="Example">Example<a class="headerlink" title="Permalink to this headline" href="#Example">¶</a></h2><div class="example"><a name="idm214169046288"></a><p class="title"><b>Example 1. /etc/binfmt.d/wine.conf example:</b></p><div class="example-contents"><pre class="programlisting"># Start WINE on Windows executables
:DOSWin:M::MZ::/usr/bin/wine:</pre></div></div><br class="example-break"></div><div class="refsect1"><a name="idm214169044640"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="systemd-binfmt.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-binfmt.service</span>(8)</span></a>,
<a href="systemd-delta.html"><span class="citerefentry"><span class="refentrytitle">systemd-delta</span>(1)</span></a>,
<a href="wine.html"><span class="citerefentry"><span class="refentrytitle">wine</span>(8)</span></a>
</p></div></div></body></html>
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