mirror of
https://github.com/systemd/systemd.git
synced 2024-11-24 02:33:36 +08:00
119 lines
4.9 KiB
XML
119 lines
4.9 KiB
XML
<?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_exit_on_failure" xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_event_source_set_exit_on_failure</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_event_source_set_exit_on_failure</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_event_source_set_exit_on_failure</refname>
|
|
<refname>sd_event_source_get_exit_on_failure</refname>
|
|
|
|
<refpurpose>Set or retrieve the exit-on-failure feature of event sources</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_event_source_set_exit_on_failure</function></funcdef>
|
|
<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
|
|
<paramdef>int <parameter>b</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_event_source_get_exit_on_failure</function></funcdef>
|
|
<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_event_source_set_exit_on_failure()</function> may be used to set/unset the
|
|
exit-on-failure flag of the event source object specified as <parameter>source</parameter>. The flag
|
|
defaults to off. If on and the callback function set for the event source returns a failure code (i.e. a
|
|
negative value) the event loop is exited too, using the callback return code as the exit code for
|
|
<citerefentry><refentrytitle>sd_event_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If
|
|
off, the event source is disabled but the event loop continues to run. Setting this flag is useful for
|
|
"dominant" event sources that define the purpose and reason for the event loop, and whose failure hence
|
|
should propagate to the event loop itself — as opposed to "auxiliary" event sources whose failures should
|
|
remain local and affect the event source, but not propagate further.</para>
|
|
|
|
<para><function>sd_event_source_get_exit_on_failure()</function> may be used to query the flag currently
|
|
set for the event source object <parameter>source</parameter>.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success, <function>sd_event_source_set_exit_on_failure()</function> returns a non-negative
|
|
integer. <function>sd_event_source_get_exit_on_failure()</function> returns 0 if the flag is off, > 0
|
|
if the flag is on. On failure, both 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>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v247"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-EDOM</constant></term>
|
|
|
|
<listitem><para>The event source refers to an exit event source (as created with
|
|
<citerefentry><refentrytitle>sd_event_add_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>),
|
|
for which this functionality is not supported.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v247"/></listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<refsect1>
|
|
<title>History</title>
|
|
<para><function>sd_event_source_set_exit_on_failure()</function> and
|
|
<function>sd_event_source_get_exit_on_failure()</function> were added in version 247.</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>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|