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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="binfmt.d" conditional='ENABLE_BINFMT'>
<refentryinfo>
<title>binfmt.d</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</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 <ulink
url="https://www.kernel.org/doc/Documentation/binfmt_misc.txt">binfmt_misc.txt</ulink>
for more information on registration of additional
binary formats and how to write rules.</para>
<para>Empty lines and lines beginning with ; and # are
ignored. Note that this means you may not use ; and #
as delimiter in binary format rules.</para>
<para>Each configuration file shall be named in the
style of <filename><replaceable>program</replaceable>.conf</filename>.
Files in <filename>/etc/</filename> override files
with the same name in <filename>/usr/lib/</filename>
and <filename>/run/</filename>. Files in
<filename>/run/</filename> override files with the
same name in <filename>/usr/lib/</filename>. Packages
should install their configuration files in
<filename>/usr/lib/</filename>, files in
<filename>/etc/</filename> 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
alphabetical order, regardless in which of the
directories they reside, to guarantee that a specific
configuration file takes precedence over another file
with an alphabetically later name.</para>
<para>If the administrator wants to disable a
configuration file supplied by the vendor, the
recommended way is to place a symlink to
<filename>/dev/null</filename> in
<filename>/etc/binfmt.d/</filename> bearing the
same filename.</para>
</refsect1>
<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><refentrytitle>wine</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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