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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_bus_message_new_signal"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_message_new_signal</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_message_new_signal</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_message_new_signal</refname>
+
+ <refpurpose>Create a signal message</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int sd_bus_message_new_signal</funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ <paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
+ <paramdef>const char *<parameter>path</parameter></paramdef>
+ <paramdef>const char *<parameter>interface</parameter></paramdef>
+ <paramdef>const char *<parameter>member</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>The <function>sd_bus_message_new_signal()</function> function creates a new bus message
+ object that encapsulates a D-Bus signal, and returns it in the <parameter>m</parameter> output
+ parameter. The signal will be sent to path <parameter>path</parameter>, on the interface
+ <parameter>interface</parameter>, member <parameter>member</parameter>. When this message is
+ sent, no reply is expected. See
+ <citerefentry><refentrytitle>sd_bus_message_new_method_call</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ for a short description of the meaning of the <parameter>path</parameter>,
+ <parameter>interface</parameter>, and <parameter>member</parameter> parameters.
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>This function returns 0 if the message object was successfully created, and a negative
+ errno-style error code otherwise.</para>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para>The output parameter <parameter>m</parameter> is
+ <constant>NULL</constant>.</para>
+
+ <para>The <parameter>path</parameter> parameter is not a valid D-Bus path
+ (<literal>/an/object/path</literal>), the <parameter>interface</parameter> parameter is not
+ a valid D-Bus interface name (<literal>an.interface.name</literal>), or the
+ <parameter>member</parameter> parameter is not a valid D-Bus member
+ (<literal>Name</literal>).</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ENOTCONN</constant></term>
+
+ <listitem><para>The bus parameter <parameter>bus</parameter> is <constant>NULL</constant> or
+ the bus is not connected.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ENOMEM</constant></term>
+
+ <listitem><para>Memory allocation failed.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Send a simple signal</title>
+
+ <programlisting><xi:include href="send-unit-files-changed.c" parse="text" /></programlisting>
+
+ <para>This function in systemd sources is used to emit the
+ <literal>UnitFilesChanged</literal> signal when the unit files have been changed.
+ </para>
+ </example>
+ </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_emit_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>