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<refentry id="sd_bus_message_set_destination">

  <refentryinfo>
    <title>sd_bus_message_set_destination</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_message_set_destination</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_message_set_destination</refname>
    <refname>sd_bus_message_set_sender</refname>
    <refpurpose>Set the destination or sender service name of a bus message</refpurpose>
  </refnamediv>

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

      <funcprototype>
        <funcdef>int <function>sd_bus_message_set_destination</function></funcdef>
        <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
        <paramdef>const char *<parameter>destination</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_message_set_sender</function></funcdef>
        <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
        <paramdef>const char *<parameter>sender</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_message_set_destination()</function> sets the destination service name for the specified bus
    message object. The specified name must be a valid unique or well-known service name.</para>

    <para><function>sd_bus_message_set_sender()</function> sets the sender service name for the specified bus message
    object. The specified name must be a valid unique or well-known service name. This function is useful only for
    messages to send on direct connections as for connections to bus brokers the broker will fill in the destination
    field anyway, and the sender field set by original sender is ignored.</para>
  </refsect1>

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

    <para>On success, these calls return 0 or a positive integer. On failure, these calls 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>A specified parameter is invalid.</para></listitem>
      </varlistentry>

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

        <listitem><para>The message is already sealed.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><constant>-EEXIST</constant></term>

        <listitem><para>The message already has a destination or sender field set.</para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Notes</title>

    <para>The <function>sd_bus_message_set_destination()</function> and
    <function>sd_bus_message_set_sender()</function> interfaces
    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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd_bus_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>
