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5a5cb6ba50
Sometimes it's hard to assign responsibility to a specific event source for exiting when there's no more work to be done. So let's add exit-on-idle support where we exit when there are no more event sources.
117 lines
4.6 KiB
XML
117 lines
4.6 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_event_set_exit_on_idle" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_event_set_exit_on_idle</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_event_set_exit_on_idle</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_event_set_exit_on_idle</refname>
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<refname>sd_event_get_exit_on_idle</refname>
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<refpurpose>Enable event loop exit-on-idle support</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_event_set_exit_on_idle</function></funcdef>
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<paramdef>sd_event *<parameter>event</parameter></paramdef>
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<paramdef>int b</paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_get_exit_on_idle</function></funcdef>
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<paramdef>sd_event *<parameter>event</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_event_set_exit_on_idle()</function> may be used to
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enable or disable the exit-on-idle support in the
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event loop object specified in the <parameter>event</parameter>
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parameter. If enabled, the event loop will exit with a zero exit code
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there are no more enabled (<constant>SD_EVENT_ON</constant>, <constant>SD_EVENT_ONESHOT</constant>),
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non-exit, non-post event sources.</para>
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<para><function>sd_event_get_exit_on_idle()</function> may be used to
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determine whether exit-on-idle support was previously requested by a
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call to <function>sd_event_set_exit_on_idle()</function> with a true
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<parameter>b</parameter> parameter and successfully enabled.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, <function>sd_event_set_exit_on_idle()</function> and
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<function>sd_event_get_exit_on_idle()</function> return a non-zero positive integer if the exit-on-idle
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support was successfully enabled. They return zero if the exit-on-idle support was explicitly disabled
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with a false <parameter>b</parameter> parameter. On failure, they return a negative errno-style error
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code.</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ECHILD</constant></term>
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<listitem><para>The event loop has been created in a different process, library or module instance.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>The passed event loop object was invalid.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>History</title>
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<para><function>sd_event_set_exit_on_idle()</function> and
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<function>sd_event_get_exit_on_idle()</function> were added in version 259.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_inotify</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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