man/sd_bus_list_names.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
   4 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
   5
   6 <refentry id="sd_bus_list_names"
   7           xmlns:xi="http://www.w3.org/2001/XInclude">
   8
   9   <refentryinfo>
  10     <title>sd_bus_list_names</title>
  11     <productname>systemd</productname>
  12   </refentryinfo>
  13
  14   <refmeta>
  15     <refentrytitle>sd_bus_list_names</refentrytitle>
  16     <manvolnum>3</manvolnum>
  17   </refmeta>
  18
  19   <refnamediv>
  20     <refname>sd_bus_list_names</refname>
  21
  22     <refpurpose>Retrieve information about registered names on a bus</refpurpose>
  23   </refnamediv>
  24
  25   <refsynopsisdiv>
  26     <funcsynopsis>
  27       <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
  28
  29       <funcprototype>
  30         <funcdef>int <function>sd_bus_list_names</function></funcdef>
  31         <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
  32         <paramdef>char ***<parameter>acquired</parameter></paramdef>
  33         <paramdef>char ***<parameter>activatable</parameter></paramdef>
  34       </funcprototype>
  35     </funcsynopsis>
  36   </refsynopsisdiv>
  37
  38   <refsect1>
  39     <title>Description</title>
  40
  41     <para><function>sd_bus_list_names()</function> retrieves information about the registered names on a bus.
  42     If <parameter>acquired</parameter> is not <constant>NULL</constant>, this function calls
  43     <ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-list-names">
  44     org.freedesktop.DBus.ListNames</ulink> to retrieve the list of currently-owned names on the bus. If
  45     <parameter>acquired</parameter> is not <constant>NULL</constant>, the function calls
  46     <ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-list-activatable-names">
  47     org.freedesktop.DBus.ListActivableNames</ulink> to retrieve the list of all names on the bus that can be
  48     activated. Note that ownership of the arrays returned by <function>sd_bus_list_names()</function> in
  49     <parameter>acquired</parameter> and <parameter>activatable</parameter> is transferred to the caller and
  50     hence, the caller is responsible for freeing these arrays and their contents.</para>
  51   </refsect1>
  52
  53   <refsect1>
  54     <title>Return Value</title>
  55
  56     <para>On success, <function>sd_bus_list_names()</function> returns a non-negative integer. On failure,
  57     it returns a negative errno-style error code.</para>
  58
  59     <refsect2>
  60       <title>Errors</title>
  61
  62       <para>Returned errors may indicate the following problems:</para>
  63
  64       <variablelist>
  65         <varlistentry>
  66           <term><constant>-EINVAL</constant></term>
  67
  68           <listitem><para><parameter>bus</parameter> or both <parameter>acquired</parameter> and
  69           <parameter>activatable</parameter> were <constant>NULL</constant>.</para></listitem>
  70         </varlistentry>
  71
  72         <varlistentry>
  73           <term><constant>-ENOPKG</constant></term>
  74
  75           <listitem><para>The bus cannot be resolved.</para></listitem>
  76         </varlistentry>
  77
  78         <varlistentry>
  79           <term><constant>-ECHILD</constant></term>
  80
  81           <listitem><para>The bus was created in a different process, library or module instance.</para></listitem>
  82         </varlistentry>
  83
  84         <varlistentry>
  85           <term><constant>-ENOMEM</constant></term>
  86
  87           <listitem><para>Memory allocation failed.</para></listitem>
  88         </varlistentry>
  89
  90         <varlistentry>
  91           <term><constant>-ENOTCONN</constant></term>
  92
  93           <listitem><para>The bus is not connected.</para></listitem>
  94         </varlistentry>
  95       </variablelist>
  96     </refsect2>
  97   </refsect1>
  98
  99   <xi:include href="libsystemd-pkgconfig.xml" />
 100
 101   <refsect1>
 102     <title>History</title>
 103     <para><function>sd_bus_list_names()</function> was added in version 221.</para>
 104   </refsect1>
 105
 106   <refsect1>
 107     <title>See Also</title>
 108
 109     <para><simplelist type="inline">
 110       <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
 111       <member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
 112     </simplelist></para>
 113   </refsect1>
 114 </refentry>