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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_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 <libudev.h></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>History</title>
<para><function>udev_monitor_receive_device()</function>,
<function>udev_monitor_enable_receiving()</function>,
<function>udev_monitor_set_receive_buffer_size()</function>,
<function>udev_monitor_get_fd()</function>, and
<function>udev_monitor_get_udev()</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_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>
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