Adding upstream version 241.upstream/241upstream

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

1 files changed, 166 insertions, 0 deletions

diff --git a/man/sd_bus_message_new_method_call.xml b/man/sd_bus_message_new_method_call.xml
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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_bus_message_new_method_call"
+          xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_bus_message_new_method_call</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_message_new_method_call</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_message_new_method_call</refname>
+    <refname>sd_bus_message_new_method_return</refname>
+
+    <refpurpose>Create a method call message</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>int sd_bus_message_new_method_call</funcdef>
+        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+        <paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
+        <paramdef>const char *<parameter>destination</parameter></paramdef>
+        <paramdef>const char *<parameter>path</parameter></paramdef>
+        <paramdef>const char *<parameter>interface</parameter></paramdef>
+        <paramdef>const char *<parameter>member</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int sd_bus_message_new_method_return</funcdef>
+        <paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
+        <paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>The <function>sd_bus_message_new_method_call()</function> function creates a new bus
+    message object that encapsulates a D-Bus method call, and returns it in the
+    <parameter>m</parameter> output parameter. The call will be made on the destination
+    <parameter>destination</parameter>, path <parameter>path</parameter>, on the interface
+    <parameter>interface</parameter>, member <parameter>member</parameter>.</para>
+
+    <para>Briefly, the <emphasis>destination</emphasis> is a dot-separated name that identifies a
+    service connected to the bus. The <emphasis>path</emphasis> is a slash-separated identifier of
+    an object within the destination that resembles a file system path. The meaning of this path is
+    defined by the destination. The <emphasis>interface</emphasis> is a dot-separated name that
+    resembles a Java interface name that identifies a group of methods and signals supported by the
+    object identified by path. Methods and signals are collectively called
+    <emphasis>members</emphasis> and are identified by a simple name composed of ASCII letters,
+    numbers, and underscores. See the <ulink
+    url="https://dbus.freedesktop.org/doc/dbus-tutorial.html#concepts">D-Bus Tutorial</ulink> for an
+    in-depth explanation.</para>
+
+    <para>The <parameter>destination</parameter> parameter may be <constant>NULL</constant>. The
+    <parameter>interface</parameter> parameter may be <constant>NULL</constant>, if the destination
+    has only a single member with the given name and there is no ambiguity if the interface name is
+    omitted.</para>
+
+    <para>The <function>sd_bus_message_new_method_call()</function> function creates a new bus
+    message object that is a reply to the method call <parameter>call</parameter> and returns it in
+    the <parameter>m</parameter> output parameter. The <parameter>call</parameter> parameter must be
+    a method call message. The sender of <parameter>call</parameter> is used as the destination.
+    </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>
+  </refsect1>
+
+  <refsect1 id='errors'>
+    <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>destination</parameter> parameter is non-null and is not a valid D-Bus
+        service name (<literal>org.somewhere.Something</literal>), the <parameter>path</parameter>
+        parameter is not a valid D-Bus path (<literal>/an/object/path</literal>), the
+        <parameter>interface</parameter> parameter is non-null and 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>
+
+        <para>The <parameter>call</parameter> parameter is not a method call object.</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>
+
+      <varlistentry>
+        <term><constant>-EPERM</constant></term>
+
+        <listitem>
+        <para>The <parameter>call</parameter> parameter is not sealed.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EOPNOTSUPP</constant></term>
+
+        <listitem>
+        <para>The <parameter>call</parameter> message does not have a cookie.</para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>Examples</title>
+
+    <example>
+      <title>Make a call to a D-Bus method that takes a single parameter</title>
+
+      <programlisting><xi:include href="print-unit-path.c" parse="text" /></programlisting>
+      <para>This defines a minimally useful program that will open a connection to the bus, create a
+      message object, send it, wait for the reply, and finally extract and print the answer. It does
+      error handling and proper memory management.</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_path_encode</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>