systemd/man/sd_bus_list_names.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->

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

  <refentryinfo>
    <title>sd_bus_list_names</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_list_names</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_list_names</refname>

    <refpurpose>Retrieve information about registered names on a bus</refpurpose>
  </refnamediv>

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

      <funcprototype>
        <funcdef>int <function>sd_bus_list_names</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>char ***<parameter>acquired</parameter></paramdef>
        <paramdef>char ***<parameter>activatable</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_list_names()</function> retrieves information about the registered names on a bus.
    If <parameter>acquired</parameter> is not <constant>NULL</constant>, this function calls
    <ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-list-names">
    org.freedesktop.DBus.ListNames</ulink> to retrieve the list of currently-owned names on the bus. If
    <parameter>acquired</parameter> is not <constant>NULL</constant>, the function calls
    <ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-list-activatable-names">
    org.freedesktop.DBus.ListActivableNames</ulink> to retrieve the list of all names on the bus that can be
    activated. Note that ownership of the arrays returned by <function>sd_bus_list_names()</function> in
    <parameter>acquired</parameter> and <parameter>activatable</parameter> is transferred to the caller and
    hence, the caller is responsible for freeing these arrays and their contents.</para>
  </refsect1>

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

    <para>On success, <function>sd_bus_list_names()</function> returns a non-negative integer. On failure,
    it returns a negative errno-style error code.</para>

    <refsect2>
      <title>Errors</title>

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

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

          <listitem><para><parameter>bus</parameter> or both <parameter>acquired</parameter> and
          <parameter>activatable</parameter> were <constant>NULL</constant>.</para></listitem>
        </varlistentry>

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

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

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

          <listitem><para>The bus was created in a different process, library or module instance.</para></listitem>
        </varlistentry>

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

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

        <varlistentry>
          <term><constant>-ENOTCONN</constant></term>

          <listitem><para>The bus is not connected.</para></listitem>
        </varlistentry>
      </variablelist>
    </refsect2>
  </refsect1>

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

  <refsect1>
    <title>History</title>
    <para><function>sd_bus_list_names()</function> was added in version 221.</para>
  </refsect1>

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

    <para><simplelist type="inline">
      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
    </simplelist></para>
  </refsect1>
</refentry>