man: add brief entrypoint man page for sd-varlink

We have this in a similar fashion for the other APIs libsystemd
provides. Add the same for sd-varlink. There isn't too much on it for
now, but at least it's a start.

Also link it up everywhere.

5 files changed, 71 insertions, 2 deletions

diff --git a/man/libsystemd.xml b/man/libsystemd.xml
index d3d9798d6b..ef34571dd6 100644
--- a/man/libsystemd.xml
+++ b/man/libsystemd.xml
@@ -35,6 +35,7 @@
 #include <systemd/sd-login.h>
 #include <systemd/sd-messages.h>
 #include <systemd/sd-path.h>
+#include <systemd/sd-varlink.h>
     </programlisting>
 
     <cmdsynopsis>
@@ -61,8 +62,9 @@
     <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
     <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
     <citerefentry><refentrytitle>sd-json</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-    and
     <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    and
+    <citerefentry><refentrytitle>sd-varlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>
     for information about different parts of the library interface.</para>
   </refsect1>
 
diff --git a/man/rules/meson.build b/man/rules/meson.build
index eb4300386d..ce587efb21 100644
--- a/man/rules/meson.build
+++ b/man/rules/meson.build
@@ -155,6 +155,7 @@ manpages = [
  ['sd-journal', '3', [], ''],
  ['sd-json', '3', [], ''],
  ['sd-login', '3', [], 'HAVE_PAM'],
+ ['sd-varlink', '3', [], ''],
  ['sd_booted', '3', [], ''],
  ['sd_bus_add_match',
   '3',
diff --git a/man/sd-bus.xml b/man/sd-bus.xml
index 26392d7a31..238c5a68c9 100644
--- a/man/sd-bus.xml
+++ b/man/sd-bus.xml
@@ -189,6 +189,7 @@
       <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
       <member><citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
       <member><citerefentry><refentrytitle>busctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>sd-varlink</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
       <member><citerefentry project='man-pages'><refentrytitle>dbus-daemon</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
       <member><citerefentry project='man-pages'><refentrytitle>dbus-send</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
     </simplelist></para>
diff --git a/man/sd-json.xml b/man/sd-json.xml
index e10ef0d953..95a1985d6f 100644
--- a/man/sd-json.xml
+++ b/man/sd-json.xml
@@ -84,7 +84,8 @@
   <refsect1>
     <title>See Also</title>
     <para><simplelist type="inline">
-      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>,
+      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>sd-varlink</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
       <member><citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
     </simplelist></para>
   </refsect1>
diff --git a/man/sd-varlink.xml b/man/sd-varlink.xml
new file mode 100644
index 0000000000..b28d100b31
--- /dev/null
+++ b/man/sd-varlink.xml
@@ -0,0 +1,64 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd-varlink"
+  xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd-varlink</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd-varlink</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd-varlink</refname>
+    <refpurpose>APIs for Varlink IPC</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-varlink.h&gt;</funcsynopsisinfo>
+    </funcsynopsis>
+
+    <cmdsynopsis>
+      <command>pkg-config --cflags --libs libsystemd</command>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><filename>sd-varlink.h</filename> is part of
+    <citerefentry><refentrytitle>libsystemd</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
+    provides APIs for implementing Varlink IPC clients and services. See <ulink url="https://varlink.org/"/>
+    for more information about Varlink IPC.</para>
+
+    <para>Varlink IPC uses <ulink url="https://json.org/">JSON</ulink> as marshalling format. The sd-varlink
+    API relies on the
+    <citerefentry><refentrytitle>sd-json</refentrytitle><manvolnum>3</manvolnum></citerefentry> API for JSON
+    seralization, deserialization and manipulation.</para>
+
+    <para>The <citerefentry><refentrytitle>varlinkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> tool
+    makes the functionality implemented by sd-varlink available from the command line.</para>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>See Also</title>
+    <para><simplelist type="inline">
+      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>sd-json</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>varlinkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
+      <member><citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+    </simplelist></para>
+  </refsect1>
+</refentry>