travis: use UBSan checks from OSS-Fuzz

[thirdparty/systemd.git] / man / systemd-inhibit.xml

<?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+ -->

<refentry id="systemd-inhibit"
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>systemd-inhibit</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-inhibit</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-inhibit</refname>
    <refpurpose>Execute a program with an inhibition lock taken</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>systemd-inhibit <arg choice="opt" rep="repeat">OPTIONS</arg> <arg>COMMAND</arg> <arg choice="opt" rep="repeat">ARGUMENTS</arg></command>
    </cmdsynopsis>
    <cmdsynopsis>
      <command>systemd-inhibit <arg choice="opt" rep="repeat">OPTIONS</arg> --list</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><command>systemd-inhibit</command> may be used to execute a
    program with a shutdown, sleep, or idle inhibitor lock taken. The
    lock will be acquired before the specified command line is
    executed and released afterwards.</para>

    <para>Inhibitor locks may be used to block or delay system sleep
    and shutdown requests from the user, as well as automatic idle
    handling of the OS. This is useful to avoid system suspends while
    an optical disc is being recorded, or similar operations that
    should not be interrupted.</para>

    <para>For more information see the <ulink
    url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
    Lock Developer Documentation</ulink>.</para>
  </refsect1>

  <refsect1>
    <title>Options</title>

    <para>The following options are understood:</para>

    <variablelist>
      <varlistentry>
        <term><option>--what=</option></term>

        <listitem><para>Takes a colon-separated list of one or more
        operations to inhibit:
        <literal>shutdown</literal>,
        <literal>sleep</literal>,
        <literal>idle</literal>,
        <literal>handle-power-key</literal>,
        <literal>handle-suspend-key</literal>,
        <literal>handle-hibernate-key</literal>,
        <literal>handle-lid-switch</literal>,
        for inhibiting reboot/power-off/halt/kexec,
        suspending/hibernating, the automatic idle detection, or the
        low-level handling of the power/sleep key and the lid switch,
        respectively. If omitted, defaults to
        <literal>idle:sleep:shutdown</literal>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--who=</option></term>

        <listitem><para>Takes a short, human-readable descriptive
        string for the program taking the lock. If not passed,
        defaults to the command line string.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--why=</option></term>

        <listitem><para>Takes a short, human-readable descriptive
        string for the reason for taking the lock. Defaults to
        "Unknown reason".</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--mode=</option></term>

        <listitem><para>Takes either <literal>block</literal> or
        <literal>delay</literal> and describes how the lock is
        applied. If <literal>block</literal> is used (the default),
        the lock prohibits any of the requested operations without
        time limit, and only privileged users may override it. If
        <literal>delay</literal> is used, the lock can only delay the
        requested operations for a limited time. If the time elapses,
        the lock is ignored and the operation executed. The time limit
        may be specified in
        <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
        Note that <literal>delay</literal> is only available for
        <literal>sleep</literal> and
        <literal>shutdown</literal>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--list</option></term>

        <listitem><para>Lists all active inhibition locks instead of
        acquiring one.</para></listitem>
      </varlistentry>

      <xi:include href="standard-options.xml" xpointer="no-pager" />
      <xi:include href="standard-options.xml" xpointer="no-legend" />
      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </variablelist>

  </refsect1>

  <refsect1>
    <title>Exit status</title>

    <para>Returns the exit status of the executed program.</para>
  </refsect1>

  <refsect1>
    <title>Example</title>

    <programlisting># systemd-inhibit wodim foobar.iso</programlisting>

    <para>This burns the ISO image
    <filename>foobar.iso</filename> on a CD using
    <citerefentry project='man-pages'><refentrytitle>wodim</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
    and inhibits system sleeping, shutdown and idle while
    doing so.</para>
  </refsect1>

  <xi:include href="less-variables.xml" />

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>