Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 121 insertions, 0 deletions

diff --git a/man/sd_bus_message_new_signal.xml b/man/sd_bus_message_new_signal.xml
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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>