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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_event_source_set_enabled" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_event_source_set_enabled</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_event_source_set_enabled</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_event_source_set_enabled</refname>
+ <refname>sd_event_source_get_enabled</refname>
+ <refname>SD_EVENT_ON</refname>
+ <refname>SD_EVENT_OFF</refname>
+ <refname>SD_EVENT_ONESHOT</refname>
+
+ <refpurpose>Enable or disable event sources</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-event.h&gt;</funcsynopsisinfo>
+
+ <funcsynopsisinfo><token>enum</token> {
+ <constant>SD_EVENT_OFF</constant> = 0,
+ <constant>SD_EVENT_ON</constant> = 1,
+ <constant>SD_EVENT_ONESHOT</constant> = -1,
+};</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_event_source_set_enabled</function></funcdef>
+ <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
+ <paramdef>int <parameter>enabled</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_event_source_get_enabled</function></funcdef>
+ <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
+ <paramdef>int *<parameter>enabled</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_event_source_set_enabled()</function> may be used to enable or disable the event
+ source object specified as <parameter>source</parameter>. The <parameter>enabled</parameter> parameter
+ takes one of <constant>SD_EVENT_ON</constant> (to enable), <constant>SD_EVENT_OFF</constant> (to disable)
+ or <constant>SD_EVENT_ONESHOT</constant>. If invoked with <constant>SD_EVENT_ONESHOT</constant> the event
+ source will be enabled but automatically reset to <constant>SD_EVENT_OFF</constant> after one dispatch.
+ For <constant>SD_EVENT_OFF</constant>, the event source <parameter>source</parameter> may be
+ <constant>NULL</constant>, in which case the function does nothing. Otherwise,
+ <parameter>source</parameter> must be a valid pointer to an <structname>sd_event_source</structname>
+ object.</para>
+
+ <para>Event sources that are disabled will not result in event
+ loop wakeups and will not be dispatched, until they are enabled
+ again.</para>
+
+ <para><function>sd_event_source_get_enabled()</function> may be used to query whether the event source
+ object <parameter>source</parameter> is currently enabled or not. If both the
+ <parameter>source</parameter> and the output parameter <parameter>enabled</parameter> are
+ <constant>NULL</constant>, this function returns false. Otherwise, <parameter>source</parameter> must be
+ a valid pointer to an <structname>sd_event_source</structname> object. If the output parameter
+ <parameter>enabled</parameter> is not <constant>NULL</constant>, it is set to the enablement state (one
+ of <constant>SD_EVENT_ON</constant>, <constant>SD_EVENT_OFF</constant>,
+ <constant>SD_EVENT_ONESHOT</constant>). The function also returns true if the event source is not
+ disabled.</para>
+
+ <para>Event source objects are enabled when they are first created
+ with calls such as
+ <citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>. However,
+ depending on the event source type they are enabled continuously
+ (<constant>SD_EVENT_ON</constant>) or only for a single invocation
+ of the event source handler
+ (<constant>SD_EVENT_ONESHOT</constant>). For details see the
+ respective manual pages.</para>
+
+ <para>As event source objects stay active and may be dispatched as
+ long as there is at least one reference to them, in many cases it
+ is a good idea to combine a call to
+ <citerefentry><refentrytitle>sd_event_source_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ with a prior call to
+ <function>sd_event_source_set_enabled()</function> with
+ <constant>SD_EVENT_OFF</constant>, to ensure the event source is
+ not dispatched again until all other remaining references are dropped.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_event_source_set_enabled()</function> returns a non-negative
+ integer. <function>sd_event_source_get_enabled()</function> returns zero if the source is disabled
+ (<constant>SD_EVENT_OFF</constant>) and a positive integer otherwise. On failure, they return a negative
+ errno-style error code.</para>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para><parameter>source</parameter> is not a valid pointer to an
+ <structname>sd_event_source</structname> object.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ENOMEM</constant></term>
+
+ <listitem><para>Not enough memory.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
+
+ <listitem><para>The event loop has been created in a different process, library or module instance.</para></listitem>
+
+ </varlistentry>
+
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>History</title>
+ <para><function>sd_event_source_set_enabled()</function> and
+ <function>sd_event_source_get_enabled()</function> were added in version 229.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_inotify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_source_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_source_set_ratelimit</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>