systemd/man/udev_device_get_syspath.xml

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<!--
  SPDX-License-Identifier: LGPL-2.1+

  This file is part of systemd.

  Copyright 2015 David Herrmann <dh.herrmann@gmail.com>
-->

<refentry id="udev_device_get_syspath"
  xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>udev_device_get_syspath</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_get_syspath</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>udev_device_get_syspath</refname>
    <refname>udev_device_get_sysname</refname>
    <refname>udev_device_get_sysnum</refname>
    <refname>udev_device_get_devpath</refname>
    <refname>udev_device_get_devnode</refname>
    <refname>udev_device_get_devnum</refname>
    <refname>udev_device_get_devtype</refname>
    <refname>udev_device_get_subsystem</refname>
    <refname>udev_device_get_driver</refname>
    <refname>udev_device_get_udev</refname>
    <refname>udev_device_get_parent</refname>
    <refname>udev_device_get_parent_with_subsystem_devtype</refname>
    <refname>udev_device_get_is_initialized</refname>
    <refname>udev_device_get_action</refname>

    <refpurpose>Query device properties</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;libudev.h&gt;</funcsynopsisinfo>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_syspath</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_sysname</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_sysnum</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_devpath</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_devnode</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>dev_t <function>udev_device_get_devnum</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_devtype</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_subsystem</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_driver</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>struct udev *<function>udev_device_get_udev</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>struct udev_device *<function>udev_device_get_parent</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>struct udev_device *<function>udev_device_get_parent_with_subsystem_devtype</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
        <paramdef>const char *<parameter>subsystem</parameter></paramdef>
        <paramdef>const char *<parameter>devtype</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>udev_device_get_is_initialized</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>const char *<function>udev_device_get_action</function></funcdef>
        <paramdef>struct udev_device *<parameter>udev_device</parameter></paramdef>
      </funcprototype>

    </funcsynopsis>
  </refsynopsisdiv>

  <!--<refsect1>
    <title>Description</title>

    <para>XXX: Add documentation.</para>
  </refsect1>-->

  <refsect1>
    <title>Return Value</title>

    <para>On success, <function>udev_device_get_syspath()</function>,
    <function>udev_device_get_sysname()</function>,
    <function>udev_device_get_sysnum()</function>,
    <function>udev_device_get_devpath()</function>,
    <function>udev_device_get_devnode()</function>,
    <function>udev_device_get_devtype()</function>,
    <function>udev_device_get_subsystem()</function>,
    <function>udev_device_get_driver()</function> and
    <function>udev_device_get_action()</function> return a pointer
    to a constant string that describes the requested property. The
    lifetime of this string is bound to the device it was requested
    on. On failure, each function may return
    <constant>NULL</constant>.</para>

    <para>On success, <function>udev_device_get_devnum()</function>
    returns the device type of the passed device. On failure, a
    device type with minor and major number set to
    <constant>0</constant> is returned.</para>

    <para><function>udev_device_get_udev()</function> always returns
    a valid pointer to the udev context that this device belongs
    to.</para>

    <para>On success, <function>udev_device_get_parent()</function>
    and
    <function>udev_device_get_parent_with_subsystem_devtype()</function>
    return a pointer to the parent device. No additional reference
    to this device is acquired, but the child device owns a reference
    to such a parent device. On failure, <constant>NULL</constant>
    is returned.</para>

    <para>On success, <function>udev_device_get_is_initialized()</function> returns either <constant>1</constant> or
    <constant>0</constant>, depending on whether the passed device has already been initialized by udev or not. On
    failure, a negative error code is returned. Note that devices for which no udev rules are defined are never
    reported initialized.</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_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>