<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="binfmt.d" conditional='ENABLE_BINFMT'
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>binfmt.d</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>binfmt.d</refentrytitle>
    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>binfmt.d</refname>
    <refpurpose>Configure additional binary formats for
    executables at boot</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/etc/binfmt.d/*.conf</filename></para>
    <para><filename>/run/binfmt.d/*.conf</filename></para>
    <para><filename>/usr/lib/binfmt.d/*.conf</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>At boot,
    <citerefentry><refentrytitle>systemd-binfmt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    reads configuration files from the above directories to register
    in the kernel additional binary formats for executables.</para>
  </refsect1>

  <refsect1>
    <title>Configuration Format</title>

    <para>Each file contains a list of binfmt_misc kernel binary format rules. Consult the kernel's <ulink
    url="https://docs.kernel.org/admin-guide/binfmt-misc.html">Kernel Support for
    miscellaneous Binary Formats (binfmt_misc)</ulink> documentation file for more information on
    registration of additional binary formats and how to write rules.</para>

    <para>Empty lines and lines beginning with <literal>;</literal> and <literal>#</literal> are ignored.
    Note that this means you may not use those symbols as the delimiter in binary format rules.</para>
  </refsect1>

  <xi:include href="standard-conf.xml" xpointer="confd" />

  <refsect1>
    <title>Example</title>
    <example>
      <title>/etc/binfmt.d/wine.conf example:</title>

      <programlisting># Start WINE on Windows executables
:DOSWin:M::MZ::/usr/bin/wine:</programlisting>
    </example>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-binfmt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry project='die-net'><refentrytitle>wine</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>
