Adding upstream version 255.4.upstream/255.4

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

1 files changed, 198 insertions, 0 deletions

diff --git a/man/udev_device_new_from_syspath.xml b/man/udev_device_new_from_syspath.xml
new file mode 100644
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+++ b/man/udev_device_new_from_syspath.xml
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
+<!ENTITY % entities SYSTEM "custom-entities.ent" >
+%entities;
+]>
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="udev_device_new_from_syspath"
+  xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>udev_device_new_from_syspath</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>udev_device_new_from_syspath</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>udev_device_new_from_syspath</refname>
+    <refname>udev_device_new_from_devnum</refname>
+    <refname>udev_device_new_from_subsystem_sysname</refname>
+    <refname>udev_device_new_from_device_id</refname>
+    <refname>udev_device_new_from_environment</refname>
+    <refname>udev_device_ref</refname>
+    <refname>udev_device_unref</refname>
+
+    <refpurpose>Create, acquire and release a udev device object</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;libudev.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_new_from_syspath</function></funcdef>
+        <paramdef>struct udev *<parameter>udev</parameter></paramdef>
+        <paramdef>const char *<parameter>syspath</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_new_from_devnum</function></funcdef>
+        <paramdef>struct udev *<parameter>udev</parameter></paramdef>
+        <paramdef>char <parameter>type</parameter></paramdef>
+        <paramdef>dev_t <parameter>devnum</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_new_from_subsystem_sysname</function></funcdef>
+        <paramdef>struct udev *<parameter>udev</parameter></paramdef>
+        <paramdef>const char *<parameter>subsystem</parameter></paramdef>
+        <paramdef>const char *<parameter>sysname</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_new_from_device_id</function></funcdef>
+        <paramdef>struct udev *<parameter>udev</parameter></paramdef>
+        <paramdef>const char *<parameter>id</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_new_from_environment</function></funcdef>
+        <paramdef>struct udev *<parameter>udev</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_ref</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>struct udev_device *<function>udev_device_unref</function></funcdef>
+        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
+      </funcprototype>
+
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>udev_device_new_from_syspath()</function>,
+    <function>udev_device_new_from_devnum()</function>,
+    <function>udev_device_new_from_subsystem_sysname()</function>,
+    <function>udev_device_new_from_device_id()</function>, and
+    <function>udev_device_new_from_environment()</function>
+    allocate a new udev device object and returns a pointer to it. This
+    object is opaque and must not be accessed by the caller via different
+    means than functions provided by libudev. Initially, the reference count
+    of the device is 1. You can acquire further references, and drop
+    gained references via <function>udev_device_ref()</function> and
+    <function>udev_device_unref()</function>. Once the reference count hits 0,
+    the device object is destroyed and freed.</para>
+
+    <para><function>udev_device_new_from_syspath()</function>,
+    <function>udev_device_new_from_devnum()</function>,
+    <function>udev_device_new_from_subsystem_sysname()</function>, and
+    <function>udev_device_new_from_device_id()</function>
+    create the device object based on information found in
+    <filename>/sys/</filename>, annotated with properties from the udev-internal
+    device database. A syspath is any subdirectory of <filename>/sys/</filename>,
+    with the restriction that a subdirectory of <filename>/sys/devices</filename>
+    (or a symlink to one) represents a real device and as such must contain
+    a <filename>uevent</filename> file. <function>udev_device_new_from_devnum()</function>
+    takes a device type, which can be <constant>b</constant> for block devices or
+    <constant>c</constant> for character devices, as well as a devnum (see
+    <citerefentry project='man-pages'><refentrytitle>makedev</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+    <function>udev_device_new_from_subsystem_sysname()</function> looks up devices based
+    on the provided subsystem and sysname
+    (see <citerefentry><refentrytitle>udev_device_get_subsystem</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    and
+    <citerefentry><refentrytitle>udev_device_get_sysname</refentrytitle><manvolnum>3</manvolnum></citerefentry>)
+    and <function>udev_device_new_from_device_id()</function> looks up devices based on the provided
+    device ID, which is a special string in one of the following four forms:
+    <table>
+      <title>Device ID strings</title>
+
+      <tgroup cols='2'>
+        <colspec colname='example' />
+        <colspec colname='explanation' />
+        <thead><row>
+          <entry>Example</entry>
+          <entry>Explanation</entry>
+        </row></thead>
+        <tbody>
+          <row><entry><varname>b8:2</varname></entry>
+          <entry>block device major:minor</entry></row>
+
+          <row><entry><varname>c128:1</varname></entry>
+          <entry>char device major:minor</entry></row>
+
+          <row><entry><varname>n3</varname></entry>
+          <entry>network device ifindex</entry></row>
+
+          <row><entry><varname>+sound:card29</varname></entry>
+          <entry>kernel driver core subsystem:device name</entry></row>
+        </tbody>
+      </tgroup>
+    </table>
+    </para>
+
+    <para><function>udev_device_new_from_environment()</function>
+    creates a device from the current environment (see
+    <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>).
+    Each key-value pair is interpreted in the same way as if it was
+    received in an uevent (see
+    <citerefentry><refentrytitle>udev_monitor_receive_device</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+    The keys <constant>DEVPATH</constant>, <constant>SUBSYSTEM</constant>,
+    <constant>ACTION</constant>, and <constant>SEQNUM</constant> are mandatory.</para>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On success, <function>udev_device_new_from_syspath()</function>,
+    <function>udev_device_new_from_devnum()</function>,
+    <function>udev_device_new_from_subsystem_sysname()</function>,
+    <function>udev_device_new_from_device_id()</function> and
+    <function>udev_device_new_from_environment()</function> return a
+    pointer to the allocated udev device. On failure,
+    <constant>NULL</constant> is returned,
+    and <varname>errno</varname> is set appropriately.
+    <function>udev_device_ref()</function> returns the argument
+    that it was passed, unmodified.
+    <function>udev_device_unref()</function> always returns
+    <constant>NULL</constant>.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>History</title>
+    <para><function>udev_device_new_from_syspath()</function>,
+    <function>udev_device_new_from_devnum()</function>,
+    <function>udev_device_new_from_subsystem_sysname()</function>,
+    <function>udev_device_new_from_device_id()</function>,
+    <function>udev_device_new_from_environment()</function>,
+    <function>udev_device_ref()</function>, and
+    <function>udev_device_unref()</function> were added in version 221.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_device_get_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>udev_device_has_tag</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>