man: clarify what can be NULL in an sd_bus_unrefp call

[thirdparty/systemd.git] / man / systemd-rc-local-generator.xml

<?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">
<!--
  SPDX-License-Identifier: LGPL-2.1+
-->
<refentry id="systemd-rc-local-generator">

  <refentryinfo>
    <title>systemd-rc-local-generator</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-rc-local-generator</refentrytitle>
    <manvolnum>8</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-rc-local-generator</refname>
    <refpurpose>Compatibility generator for starting <filename>/etc/rc.local</filename> and <filename>/usr/sbin/halt.local</filename> during boot and shutdown</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/usr/lib/systemd/system-generators/systemd-rc-local-generator</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><filename>systemd-rc-local-generator</filename> is a generator that checks whether
    <filename>/etc/rc.local</filename> exists and is executable, and if it is pulls the
    <filename>rc-local.service</filename> unit into the boot process. This unit is responsible for running this script
    during late boot. Note that the script will be run with slightly different semantics than the original System V
    version, which was run "last" in the boot process, which is a concept that does not translate to systemd. The
    script is run after <filename>network.target</filename>, but in parallel with most other regular system
    services.</para>

    <para><filename>systemd-rc-local-generator</filename> also checks whether <filename>/usr/sbin/halt.local</filename>
    exists and is executable, and if it is pulls the <filename>halt-local.service</filename> unit into the shutdown
    process. This unit is responsible for running this script during later shutdown.</para>

    <para>Support for both <filename>/etc/rc.local</filename> and <filename>/usr/sbin/halt.local</filename> is provided
    for compatibility with specific System V systems only. However, it is strongly recommended to avoid making use of
    these scripts today, and instead provide proper unit files with appropriate dependencies for any scripts to run
    during the boot or shutdown processes.</para>

    <para><filename>systemd-rc-local-generator</filename> implements
    <citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>