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[thirdparty/systemd.git] / man / sd_bus_set_description.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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  SPDX-License-Identifier: LGPL-2.1+
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<refentry id="sd_bus_set_description" xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>sd_bus_set_description</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_set_description</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_set_description</refname>
    <refname>sd_bus_get_description</refname>
    <refname>sd_bus_set_anonymous</refname>
    <refname>sd_bus_set_trusted</refname>
    <refname>sd_bus_set_allow_interactive_authorization</refname>
    <refname>sd_bus_get_allow_interactive_authorization</refname>

    <refpurpose>Set or query properties of a bus object</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>

      <funcprototype>
        <funcdef>int <function>sd_bus_set_description</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>const char *<parameter>description</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_get_description</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>const char **<parameter>description</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_set_anonymous</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>int <parameter>b</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_set_trusted</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>int <parameter>b</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_set_allow_interactive_authorization</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>int <parameter>b</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_get_allow_interactive_authorization</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_set_description()</function> sets the description string
    that is used in logging to the specified string. The string is copied internally
    and freed when the bus object is deallocated. The
    <parameter>description</parameter> argument may be <constant>NULL</constant>, in
    which case the description is unset. This function must be called before the bus
    has been started.</para>

    <para><function>sd_bus_get_description()</function> returns a description string
    in <parameter>description</parameter>. This string may have been previously set
    with <function>sd_bus_set_description()</function> or
    <citerefentry><refentrytitle>sd_bus_open_with_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    or similar. If not set this way, a default string like <literal>system</literal>
    or <literal>user</literal> will be returned for the system or user buses,
    and <constant>NULL</constant> otherwise.</para>

    <para><function>sd_bus_set_anonymous()</function> enables or disables "anonymous
    authentication", i.e. lack of authentication, of the bus peer. This function must
    be called before the bus has been started. See the <ulink
    url="view-source:https://dbus.freedesktop.org/doc/dbus-specification.html#auth-mechanisms">Authentication
    Mechanisms</ulink> section of the D-Bus specification for details.</para>

    <para><function>sd_bus_set_trusted()</function> sets the "trusted" state on the
    <parameter>bus</parameter> object. If true, all connections on the bus are
    trusted and access to all privileged and unprivileged methods is granted.  This
    function must be called before the bus has been started.</para>

    <para><function>sd_bus_set_allow_interactive_authorization()</function>
    enables or disables interactive authorization for method calls. If true,
    messages are marked with the
    <constant>ALLOW_INTERACTIVE_AUTHORIZATION</constant> flag specified by the
    <ulink
    url="view-source:https://dbus.freedesktop.org/doc/dbus-specification.html">D-Bus</ulink>
    specification, informing the receiving side that the caller is prepared to
    wait for interactive authorization, which might take a considerable time to
    complete. If this flag is set, the user may be queried for passwords or
    confirmation via <ulink
    url="http://www.freedesktop.org/wiki/Software/polkit">polkit</ulink> or a
    similar framework.</para>

    <para><function>sd_bus_get_allow_interactive_authorization()</function> returns
    true if interactive authorization is allowed and false if not.</para>
  </refsect1>

  <refsect1>
    <title>Return Value</title>

    <para>On success, these functions return 0 or a positive integer. On failure,
    they return a negative errno-style error code.</para>
  </refsect1>

  <refsect1>
    <title>Errors</title>

    <para>Returned errors may indicate the following problems:</para>

    <variablelist>
      <varlistentry>
        <term><constant>-EINVAL</constant></term>

        <listitem><para>An argument is invalid.</para></listitem>
      </varlistentry>
    </variablelist>

    <variablelist>
      <varlistentry>
        <term><constant>-ENOPKG</constant></term>

        <listitem><para>The bus cannot be resolved.</para></listitem>
      </varlistentry>
    </variablelist>

    <variablelist>
      <varlistentry>
        <term><constant>-EPERM</constant></term>

        <listitem><para>The bus has already been started.</para></listitem>
      </varlistentry>
    </variablelist>

    <variablelist>
      <varlistentry>
        <term><constant>-ECHILD</constant></term>

        <listitem><para>The bus was created in a different process.</para></listitem>
      </varlistentry>
    </variablelist>

    <variablelist>
      <varlistentry>
        <term><constant>-ENOMEM</constant></term>

        <listitem><para>Memory allocation failed.</para></listitem>
      </varlistentry>
    </variablelist>

  </refsect1>

  <xi:include href="libsystemd-pkgconfig.xml" />

  <refsect1>
    <title>See Also</title>

    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd_bus_open_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd_bus_open_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>