man/binfmt.d.xml

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   2 <!--*-nxml-*-->
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   7   Copyright 2011 Lennart Poettering
   8
   9   systemd is free software; you can redistribute it and/or modify it
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  22 <refentry id="binfmt.d" conditional='ENABLE_BINFMT'>
  23
  24         <refentryinfo>
  25                 <title>binfmt.d</title>
  26                 <productname>systemd</productname>
  27
  28                 <authorgroup>
  29                         <author>
  30                                 <contrib>Developer</contrib>
  31                                 <firstname>Lennart</firstname>
  32                                 <surname>Poettering</surname>
  33                                 <email>lennart@poettering.net</email>
  34                         </author>
  35                 </authorgroup>
  36         </refentryinfo>
  37
  38         <refmeta>
  39                 <refentrytitle>binfmt.d</refentrytitle>
  40                 <manvolnum>5</manvolnum>
  41         </refmeta>
  42
  43         <refnamediv>
  44                 <refname>binfmt.d</refname>
  45                 <refpurpose>Configure additional binary formats for
  46                 executables at boot</refpurpose>
  47         </refnamediv>
  48
  49         <refsynopsisdiv>
  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>
  53         </refsynopsisdiv>
  54
  55         <refsect1>
  56                 <title>Description</title>
  57
  58                 <para>At boot,
  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>
  63         </refsect1>
  64
  65         <refsect1>
  66                 <title>Configuration Format</title>
  67
  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>
  73
  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>
  77
  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 in which of the
  92                 directories they reside. 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>
  95
  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>
 102         </refsect1>
 103
 104         <refsect1>
 105                 <title>Example</title>
 106                 <example>
 107                         <title>/etc/binfmt.d/wine.conf example:</title>
 108
 109                         <programlisting># Start WINE on Windows executables
 110 :DOSWin:M::MZ::/usr/bin/wine:</programlisting>
 111                 </example>
 112         </refsect1>
 113
 114         <refsect1>
 115                 <title>See Also</title>
 116                 <para>
 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>
 121                 </para>
 122         </refsect1>
 123
 124 </refentry>