man: add libudev man-pages (skeletons)

This adds man-pages for most of the libudev symbols we export. Similar
symbols are grouped together in a single man-page, with respective links
added. All man-pages contain the full skeleton including NAME, SYNOPSIS,
RETURN VALUE and SEE ALSO. However, most of them still lack the
DESCRIPTION part. This should be copied from the gtkdoc descriptions in
src/libudev/libudev*.[ch]. Any help is welcome! (the whole skeleton is
already done, so it's really just about the prose-part of the man-pages to
be written).

Missing from the man-pages are the following parts:
  - udev_set_log_fn()
  - udev_[gs]et_log_priority()
  - udev_[gs]et_userdata()
  - udev_list_entry_foreach()
  - udev_device_get_seqnum()
  - udev_device_get_usec_since_initialized()
  - udev_util_encode_string()
These are considered legacy, afaik. If not, please feel free to add them
now!

Furthermore, udev-hwdb and udev-queue are not documented at all (for the
same reasons).

1 files changed, 163 insertions, 0 deletions

diff --git a/man/udev_device_has_tag.xml b/man/udev_device_has_tag.xml
new file mode 100644
index 0000000000..480257343c
--- /dev/null
+++ b/man/udev_device_has_tag.xml
@@ -0,0 +1,163 @@
+<?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" [
+<!ENTITY % entities SYSTEM "custom-entities.ent" >
+%entities;
+]>
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2015 David Herrmann <dh.herrmann@gmail.com>
+
+  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="udev_device_has_tag"
+  xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>udev_device_has_tag</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>David</firstname>
+        <surname>Herrmann</surname>
+        <email>dh.herrmann@gmail.com</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>udev_device_has_tag</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>udev_device_has_tag</refname>
+    <refname>udev_device_get_devlinks_list_entry</refname>
+    <refname>udev_device_get_properties_list_entry</refname>
+    <refname>udev_device_get_tags_list_entry</refname>
+    <refname>udev_device_get_sysattr_list_entry</refname>
+    <refname>udev_device_get_property_value</refname>
+    <refname>udev_device_get_sysattr_value</refname>
+    <refname>udev_device_set_sysattr_value</refname>
+
+    <refpurpose>Retrieve or set device attributes</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;libudev.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>struct udev_list_entry *<function>udev_device_get_devlinks_list_entry</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_list_entry *<function>udev_device_get_properties_list_entry</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_list_entry *<function>udev_device_get_tags_list_entry</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_list_entry *<function>udev_device_get_sysattr_list_entry</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>const char *<function>udev_device_get_property_value</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+        <paramdef>const char *<parameter>key</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>udev_device_has_tag</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+        <paramdef>const char *<parameter>tag</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>const char *<function>udev_device_get_sysattr_value</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+        <paramdef>const char *<parameter>sysattr</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>udev_device_set_sysattr_value</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+        <paramdef>const char *<parameter>sysattr</parameter></paramdef>
+        <paramdef>const char *<parameter>value</parameter></paramdef>
+      </funcprototype>
+
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <!--<refsect1>
+    <title>Description</title>
+
+    <para>XXX: Add short description.</para>
+  </refsect1>-->
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On success,
+    <function>udev_device_get_devlinks_list_entry()</function>,
+    <function>udev_device_get_properties_list_entry()</function>,
+    <function>udev_device_get_tags_list_entry()</function> and
+    <function>udev_device_get_sysattr_list_entry()</function> return
+    a pointer to the first entry of the retrieved list. If that list
+    is empty, or if an error occurred, <constant>NULL</constant> is
+    returned.</para>
+
+    <para>On success,
+    <function>udev_device_get_property_value()</function> and
+    <function>udev_device_get_sysattr_value()</function> return a
+    pointer to a constant string of the requested value. On error,
+    <constant>NULL</constant> is returned.</para>
+
+    <para>On success,
+    <function>udev_device_set_sysattr_value()</function> returns
+    an integer greater than, or equal to, <constant>0</constant>.
+    On failure, a negative error code is returned.</para>
+
+    <para>On success, <function>udev_device_has_tag()</function>
+    returns <constant>1</constant> or <constant>0</constant>,
+    depending on whether the device has the given tag or not.
+    On failure, a negative error code is returned.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_device_new_from_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_device_get_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_list_entry</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+    </para>
+  </refsect1>
+
+</refentry>