3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
5 This file is part of systemd.
7 Copyright 2011 Lennart Poettering
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 <refentry id="binfmt.d" conditional='ENABLE_BINFMT'>
25 <title>binfmt.d</title>
26 <productname>systemd</productname>
30 <contrib>Developer</contrib>
31 <firstname>Lennart</firstname>
32 <surname>Poettering</surname>
33 <email>lennart@poettering.net</email>
39 <refentrytitle>binfmt.d</refentrytitle>
40 <manvolnum>5</manvolnum>
44 <refname>binfmt.d</refname>
45 <refpurpose>Configure additional binary formats for
46 executables at boot</refpurpose>
50 <para><filename>/etc/binfmt.d/*.conf</filename></para>
51 <para><filename>/run/binfmt.d/*.conf</filename></para>
52 <para><filename>/usr/lib/binfmt.d/*.conf</filename></para>
56 <title>Description</title>
59 <citerefentry><refentrytitle>systemd-binfmt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
60 reads configuration files from the above directories
61 to register in the kernel additional binary
62 formats for executables.</para>
66 <title>Configuration Format</title>
68 <para>Each file contains a list of binfmt_misc kernel
69 binary format rules. Consult <ulink
70 url="https://www.kernel.org/doc/Documentation/binfmt_misc.txt">binfmt_misc.txt</ulink>
71 for more information on registration of additional
72 binary formats and how to write rules.</para>
74 <para>Empty lines and lines beginning with ; and # are
75 ignored. Note that this means you may not use ; and #
76 as delimiter in binary format rules.</para>
78 <para>Each configuration file shall be named in the
79 style of <filename><replaceable>program</replaceable>.conf</filename>.
80 Files in <filename>/etc/</filename> override files
81 with the same name in <filename>/usr/lib/</filename>
82 and <filename>/run/</filename>. Files in
83 <filename>/run/</filename> override files with the
84 same name in <filename>/usr/lib/</filename>. Packages
85 should install their configuration files in
86 <filename>/usr/lib/</filename>, files in
87 <filename>/etc/</filename> are reserved for the local
88 administrator, who may use this logic to override the
89 configuration files installed from vendor
90 packages. All files are sorted by their filename in
91 lexicographic order, regardless of which of the
92 directories they reside in. If multiple files specify
93 the same binary type name, the entry in the file with
94 the lexicographically latest name will be applied.</para>
96 <para>If the administrator wants to disable a
97 configuration file supplied by the vendor, the
98 recommended way is to place a symlink to
99 <filename>/dev/null</filename> in
100 <filename>/etc/binfmt.d/</filename> bearing the
101 same filename.</para>
105 <title>Example</title>
107 <title>/etc/binfmt.d/wine.conf example:</title>
109 <programlisting># Start WINE on Windows executables
110 :DOSWin:M::MZ::/usr/bin/wine:</programlisting>
115 <title>See Also</title>
117 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
118 <citerefentry><refentrytitle>systemd-binfmt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
119 <citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
120 <citerefentry><refentrytitle>wine</refentrytitle><manvolnum>8</manvolnum></citerefentry>