systemd/man/sd_bus_set_sender.xml

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<refentry id="sd_bus_set_sender">

  <refentryinfo>
    <title>sd_bus_set_sender</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Lennart</firstname>
        <surname>Poettering</surname>
        <email>lennart@poettering.net</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_set_sender</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_set_sender</refname>
    <refname>sd_bus_get_sender</refname>

    <refpurpose>Configure default sender for outgoing messages</refpurpose>
  </refnamediv>

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

      <funcprototype>
        <funcdef>int <function>sd_bus_set_sender</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>const char* <parameter>name</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_get_sender</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>const char** <parameter>name</parameter></paramdef>
      </funcprototype>

    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_set_sender()</function> configures the default sender service name to use for outgoing
    messages. The service name specified in the <parameter>name</parameter> parameter is set on all outgoing messages
    that are sent on the connection and have no sender set yet, for example through
    <citerefentry><refentrytitle>sd_bus_message_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Note
    that this function is only supported on direct connections, i.e. not on connections to a bus broker as the broker
    will fill in the sender service name automatically anyway. By default no sender name is configured, and hence
    messages are sent without sender field set. If the <parameter>name</parameter> parameter is specified as
    <constant>NULL</constant> the default sender service name is cleared, returning to the default state if a default
    sender service name was set before. If passed as non-<constant>NULL</constant> the specified name must be a valid
    unique or well-known service name.</para>

    <para><function>sd_bus_get_sender()</function> may be used to query the current default service name for outgoing
    messages.</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>-ECHILD</constant></term>

        <listitem><para>The bus connection has been created in a different process.</para></listitem>
      </varlistentry>

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

        <listitem><para>The specified bus connection object is a not a direct but a brokered connection.</para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Notes</title>

    <para><function>sd_bus_set_sender()</function> and <function>sd_bus_get_sender()</function> are available as
    a shared library, which can be compiled and linked to with the <constant>libsystemd</constant> <citerefentry
    project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> file.</para>
  </refsect1>

  <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_message_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>