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184 lines
8.7 KiB
XML
184 lines
8.7 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/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_bus_set_property"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_set_property</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_set_property</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_set_property</refname>
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<refname>sd_bus_set_propertyv</refname>
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<refname>sd_bus_get_property</refname>
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<refname>sd_bus_get_property_trivial</refname>
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<refname>sd_bus_get_property_string</refname>
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<refname>sd_bus_get_property_strv</refname>
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<refpurpose>Set or query D-Bus service properties</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_set_property</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>const char *<parameter>type</parameter></paramdef>
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<paramdef>...</paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_set_propertyv</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>const char *<parameter>type</parameter></paramdef>
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<paramdef>va_list <parameter>ap</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_property</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>sd_bus_message **<parameter>reply</parameter></paramdef>
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<paramdef>const char *<parameter>type</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_property_trivial</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>char <parameter>type</parameter></paramdef>
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<paramdef>void *<parameter>ret_ptr</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_property_string</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>char **<parameter>ret</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_property_strv</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>interface</parameter></paramdef>
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<paramdef>const char *<parameter>member</parameter></paramdef>
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<paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
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<paramdef>char ***<parameter>ret</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>These functions set or query D-Bus properties. D-Bus properties are service fields exposed
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via the <constant>org.freedesktop.DBus.Properties</constant> interface. Under the hood, these
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functions call methods of the <constant>org.freedesktop.DBus.Properties</constant> interface and
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as a result their semantics are similar to
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<citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_set_property()</function> sets a D-Bus property. If setting the property
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fails or an internal error occurs, an error is returned and an extended description of the error
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is optionally stored in <parameter>ret_error</parameter> if it is not <constant>NULL</constant>.
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<parameter>type</parameter> and the arguments that follow it describe the new value of the
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property and must follow the format described in
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<citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_set_propertyv()</function> is equivalent to
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<function>sd_bus_set_property()</function>, except that it is called with a
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<literal>va_list</literal> instead of a variable number of arguments.</para>
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<para><function>sd_bus_get_property()</function> queries a D-Bus property. If retrieving the
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property fails or an internal error occurs, an error is returned and an extended description of
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the error is optionally stored in <parameter>ret_error</parameter> if it is not
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<constant>NULL</constant>. On success, the property is stored in <parameter>reply</parameter>.
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<parameter>type</parameter> describes the property type and must follow the format described in
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<citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_get_property_trivial()</function>,
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<function>sd_bus_get_property_string()</function> and
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<function>sd_bus_get_property_strv()</function> are shorthands for
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<function>sd_bus_get_property()</function> that are used to query basic, string and string
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vector properties respectively. The caller is responsible for freeing the string and string
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vector results stored in <parameter>ret</parameter> by
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<function>sd_bus_get_property_string()</function> and
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<function>sd_bus_get_property_strv()</function>.</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, these functions return a non-negative integer. On failure, they return a
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negative errno-style error code.</para>
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<refsect2 id='errors'>
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<title>Errors</title>
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<para>See the
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<citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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man page for a list of possible errors.</para>
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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_bus_set_property()</function>,
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<function>sd_bus_set_propertyv()</function>,
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<function>sd_bus_get_property()</function>,
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<function>sd_bus_get_property_trivial()</function>,
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<function>sd_bus_get_property_string()</function>, and
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<function>sd_bus_get_property_strv()</function> were added in version 246.</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-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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