From ba4b35669ef233fef414b1429fbdc085537b33e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Thu, 2 Oct 2014 20:49:30 -0400
Subject: [PATCH] man: add sd_event_get_fd(3)
Example from Tom Gundersen is included using xi:include.
The copyright notice stands out a bit. Maybe it should be removed,
and the code placed in public domain.
---
Makefile-man.am | 2 +
man/sd_event_get_fd.xml | 137 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 139 insertions(+)
create mode 100644 man/sd_event_get_fd.xml
diff --git a/Makefile-man.am b/Makefile-man.am
index 2b3fa95e70..aff5186c2d 100644
--- a/Makefile-man.am
+++ b/Makefile-man.am
@@ -733,6 +733,7 @@ MANPAGES += \
man/sd_event_add_defer.3 \
man/sd_event_add_signal.3 \
man/sd_event_add_time.3 \
+ man/sd_event_get_fd.3 \
man/sd_event_new.3 \
man/systemd-bus-proxyd.8 \
man/systemd-bus-proxyd@.service.8
@@ -1574,6 +1575,7 @@ EXTRA_DIST += \
man/sd_event_add_defer.xml \
man/sd_event_add_signal.xml \
man/sd_event_add_time.xml \
+ man/sd_event_get_fd.xml \
man/sd_event_new.xml \
man/sd_get_seats.xml \
man/sd_id128_get_machine.xml \
diff --git a/man/sd_event_get_fd.xml b/man/sd_event_get_fd.xml
new file mode 100644
index 0000000000..f60d807136
--- /dev/null
+++ b/man/sd_event_get_fd.xml
@@ -0,0 +1,137 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+This file is part of systemd.
+
+Copyright 2014 Zbigniew Jędrzejewski-Szmek
+
+systemd is free software; you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+systemd is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_event_get_fd" conditional="ENABLE_KDBUS"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_event_get_fd</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>More text</contrib>
+ <firstname>Zbigniew</firstname>
+ <surname>Jędrzejewski-Szmek</surname>
+ <email>zbyszek@in.waw.pl</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_event_get_fd</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_event_get_fd</refname>
+
+ <refpurpose>Obtain a file descriptor to poll for event loop events</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_event_get_fd</function></funcdef>
+ <paramdef>sd_bus *<parameter>event</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_event_get_fd()</function> returns the file
+ descriptor that the event loop object returned by the
+ <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ function uses to wait for events. This file descriptor can be
+ polled for events. This makes it possible to embed the
+ <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ event loop inside of another event loop.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_event_get_fd()</function> returns a
+ non-negative integer. On failure, it returns 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><parameter>event</parameter> is not a valid
+ pointer to an <structname>sd_event</structname> structure.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
+
+ <listitem><para>The event loop has been created in a different process.</para></listitem>
+
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Integration in glib event loop</title>
+
+ <programlisting><xi:include href="glib-event-glue.c" parse="text" /></programlisting>
+ </example>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <para><function>sd_event_get_fd()</function> is 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>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>