diff options
Diffstat (limited to 'man/sd_bus_slot_ref.xml')
| -rw-r--r-- | man/sd_bus_slot_ref.xml | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/man/sd_bus_slot_ref.xml b/man/sd_bus_slot_ref.xml new file mode 100644 index 0000000..c200bc4 --- /dev/null +++ b/man/sd_bus_slot_ref.xml @@ -0,0 +1,94 @@ +<?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_bus_slot_ref" xmlns:xi="http://www.w3.org/2001/XInclude"> + <refentryinfo> + <title>sd_bus_slot_ref</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_slot_ref</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_slot_ref</refname> + <refname>sd_bus_slot_unref</refname> + <refname>sd_bus_slot_unrefp</refname> + + <refpurpose>Create and destroy references to a bus slot object</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>sd_bus_slot *<function>sd_bus_slot_ref</function></funcdef> + <paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>sd_bus_slot *<function>sd_bus_slot_unref</function></funcdef> + <paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>void <function>sd_bus_slot_unrefp</function></funcdef> + <paramdef>sd_bus_slot **<parameter>slotp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_slot_ref()</function> increases the reference counter of + <parameter>slot</parameter> by one.</para> + + <para><function>sd_bus_slot_unref()</function> decreases the reference counter of + <parameter>slot</parameter> by one. Once the reference count has dropped to zero, slot object is + destroyed and cannot be used anymore, so further calls to <function>sd_bus_slot_ref()</function> + or <function>sd_bus_slot_unref()</function> are illegal.</para> + + <para><function>sd_bus_slot_unrefp()</function> is similar to + <function>sd_bus_slot_unref()</function> but takes a pointer to a pointer to an + <type>sd_bus_slot</type> object. This call is useful in conjunction with GCC's and LLVM's <ulink + url="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">Clean-up Variable + Attribute</ulink>. See + <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry> + for an example how to use the cleanup attribute.</para> + + <para><function>sd_bus_slot_ref()</function> and <function>sd_bus_slot_unref()</function> + execute no operation if the passed in bus object address is + <constant>NULL</constant>. <function>sd_bus_slot_unrefp()</function> will first dereference + its argument, which must not be <constant>NULL</constant>, and will execute no operation if + <emphasis>that</emphasis> is <constant>NULL</constant>.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para><function>sd_bus_slot_ref()</function> always returns the argument.</para> + + <para><function>sd_bus_slot_unref()</function> always returns <constant>NULL</constant>.</para> + </refsect1> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_message_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_call_method_async</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |