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[thirdparty/systemd.git] / man / udev_monitor_receive_device.xml

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  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->

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

  <refentryinfo>
    <title>udev_monitor_receive_device</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>udev_monitor_receive_device</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>udev_monitor_receive_device</refname>
    <refname>udev_monitor_enable_receiving</refname>
    <refname>udev_monitor_set_receive_buffer_size</refname>
    <refname>udev_monitor_get_fd</refname>
    <refname>udev_monitor_get_udev</refname>

    <refpurpose>Query and modify device monitor</refpurpose>
  </refnamediv>

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

      <funcprototype>
        <funcdef>struct udev_device *<function>udev_monitor_receive_device</function></funcdef>
        <paramdef>struct udev_monitor *<parameter>udev_monitor</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>udev_monitor_enable_receiving</function></funcdef>
        <paramdef>struct udev_monitor *<parameter>udev_monitor</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>udev_monitor_set_receive_buffer_size</function></funcdef>
        <paramdef>struct udev_monitor *<parameter>udev_monitor</parameter></paramdef>
        <paramdef>int <parameter>size</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>udev_monitor_get_fd</function></funcdef>
        <paramdef>struct udev_monitor *<parameter>udev_monitor</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>struct udev *<function>udev_monitor_get_udev</function></funcdef>
        <paramdef>struct udev_monitor *<parameter>udev_monitor</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_monitor_receive_device()</function> returns a
    pointer to a newly referenced device that was received via the
    monitor. The caller is responsible to drop this reference when
    done. On failure, <constant>NULL</constant> is returned.</para>

    <para>On success,
    <function>udev_monitor_enable_receiving()</function> and
    <function>udev_monitor_set_receive_buffer_size()</function>
    return an integer greater than, or equal to,
    <constant>0</constant>. On failure, a negative error code is
    returned.</para>

    <para>On success, <function>udev_monitor_get_fd()</function>
    returns the file descriptor used by this monitor. On failure,
    a negative error code is returned.</para>

    <para><function>udev_monitor_get_udev()</function> always returns
    a pointer to the udev context that this monitor is associated
    with.</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_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>udev_monitor_filter_update</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>