11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
132 lines
5 KiB
XML
132 lines
5 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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-->
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<refentry id="sd_event_source_unref" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_event_source_unref</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_event_source_unref</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_source_unref</refname>
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<refname>sd_event_source_unrefp</refname>
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<refname>sd_event_source_ref</refname>
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<refpurpose>Increase or decrease event source reference counters</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>sd_event_source* <function>sd_event_source_unref</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>sd_event_source_unrefp</function></funcdef>
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<paramdef>sd_event_source **<parameter>source</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_event_source* <function>sd_event_source_ref</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</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_source_unref()</function> may be used to
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decrement by one the reference counter of the event source object
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specified as <parameter>source</parameter>. The reference counter
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is initially set to one, when the event source is created with calls
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such as
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<citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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or
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<citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>. When
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the reference counter reaches zero it is removed from its event loop
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object and destroyed.</para>
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<para><function>sd_event_source_unrefp()</function> is similar to
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<function>sd_event_source_unref()</function> but takes a pointer to a
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pointer to an <type>sd_event_source</type> object. This call is useful in
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conjunction with GCC's and LLVM's <ulink
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url="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">Clean-up
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Variable Attribute</ulink>. Note that this function is defined as
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inline function.</para>
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<para><function>sd_event_source_ref()</function> may be used
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to increase by one the reference counter of the event source object
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specified as <parameter>source</parameter>.</para>
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<para><function>sd_event_source_unref()</function>,
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<function>sd_bus_creds_unrefp()</function> and
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<function>sd_bus_creds_ref()</function> execute no operation if
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the passed event source object is
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<constant>NULL</constant>.</para>
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<para>Note that event source objects stay alive and may be
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dispatched as long as they have a reference counter greater than
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zero. In order to drop a reference of an event source and make
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sure the associated event source handler function is not called
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anymore it is recommended to combine a call of
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<function>sd_event_source_unref()</function> with a prior call to
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<function>sd_event_source_set_enabled()</function> with
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<constant>SD_EVENT_OFF</constant>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>sd_event_source_unref()</function> always returns
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<constant>NULL</constant>.
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<function>sd_event_source_ref()</function> always returns the
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event source object passed in.</para>
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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>See Also</title>
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<para>
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<citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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