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215 lines
9.1 KiB
XML
215 lines
9.1 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_bus_set_server"
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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_server</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_server</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_server</refname>
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<refname>sd_bus_is_server</refname>
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<refname>sd_bus_get_bus_id</refname>
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<refname>sd_bus_set_bus_client</refname>
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<refname>sd_bus_is_bus_client</refname>
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<refname>sd_bus_set_monitor</refname>
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<refname>sd_bus_is_monitor</refname>
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<refpurpose>Configure connection mode for a bus object</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_server</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>int <parameter>b</parameter></paramdef>
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<paramdef>sd_id128_t <parameter>id</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_is_server</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_bus_id</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>sd_id128_t *<parameter>id</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_set_bus_client</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>int <parameter>b</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_is_bus_client</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_set_monitor</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>int <parameter>b</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_is_monitor</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</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_bus_set_server()</function> configures the bus object as a server for direct D-Bus
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connections. <parameter>b</parameter> enables/disables the server mode. If zero, the server mode is
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disabled. Otherwise, the server mode is enabled. Configuring a bus object as a server is required to
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allow establishing direct connections between two peers without going via the D-Bus daemon.
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<parameter>id</parameter> must contain a 128-bit integer id for the server. If clients add a guid field
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to their D-Bus address string, the server id must match this guid or the D-Bus authentication handshake
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will fail. If no specific id is defined for the server,
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<citerefentry><refentrytitle>sd_id128_randomize</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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can be used to generate a random id instead.</para>
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<para><function>sd_bus_is_server()</function> returns whether the server mode is enabled for the given
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bus object.</para>
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<para><function>sd_bus_get_bus_id()</function> stores the D-Bus server id configured using
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<function>sd_bus_set_server()</function> (for server bus objects) or received during D-Bus authentication
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(for client bus objects) in <parameter>id</parameter>.</para>
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<para><function>sd_bus_set_bus_client()</function> configures the bus object as a D-Bus daemon client.
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<parameter>b</parameter> enables/disables the client mode. If zero, the client mode is disabled and the
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bus object should connect directly to a D-Bus server. Otherwise, the client mode is enabled and the bus
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object should connect to a D-Bus daemon. When connecting to an existing bus using any of the functions in
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the <citerefentry><refentrytitle>sd_bus_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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family of functions or any of the functions in the
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<citerefentry><refentrytitle>sd_bus_default</refentrytitle><manvolnum>3</manvolnum></citerefentry> family
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of functions, the bus object is automatically configured as a bus client. However, when connecting to a
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D-Bus daemon by calling
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<citerefentry><refentrytitle>sd_bus_set_address</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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followed by
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<citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry>, the bus
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object should be manually configured as a bus client using <function>sd_bus_set_bus_client()</function>.
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By default, a bus object is not configured as a D-Bus daemon client.</para>
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<para><function>sd_bus_is_bus_client()</function> returns whether the client mode is enabled/disabled for
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the given bus object.</para>
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<para><function>sd_bus_set_monitor()</function> configures the bus object as a D-Bus monitor object.
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<parameter>b</parameter> enables/disables the monitor mode. If zero, the monitor mode is disabled. If
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non-zero, the monitor mode is enabled. When the monitor mode is enabled, no messages may be sent via the
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bus object and it may not expose any objects on the bus. To start monitoring messages, call the
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<function>org.freedesktop.DBus.Monitoring.BecomeMonitor</function> method of the D-Bus daemon and pass
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a list of matches indicating which messages to intercept. See
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<ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-become-monitor">
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The D-Bus specification</ulink> for more information.</para>
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<para><function>sd_bus_is_monitor()</function> returns whether the monitor mode is enabled/disabled for
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the given bus object.</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_bus_set_server()</function>,
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<function>sd_bus_get_bus_id()</function>, <function>sd_bus_set_bus_client()</function> and
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<function>sd_bus_set_monitor()</function> return a non-negative integer. On failure, they return a
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negative errno-style error code.</para>
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<para><function>sd_bus_is_server()</function>, <function>sd_bus_is_bus_client()</function> and
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<function>sd_bus_is_monitor()</function> return a positive integer when the server or client mode is
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enabled, respectively. Otherwise, they return zero.</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 bus connection has been created in a different process, library or module instance.</para>
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<xi:include href="version-info.xml" xpointer="v246"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EPERM</constant></term>
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<listitem><para>The bus connection has already been started.</para>
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<xi:include href="version-info.xml" xpointer="v246"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOPKG</constant></term>
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<listitem><para>The bus cannot be resolved.</para>
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<xi:include href="version-info.xml" xpointer="v246"/></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>A required parameter was <constant>NULL</constant> or
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<parameter>b</parameter> was zero and <parameter>id</parameter> did not equal
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<constant>SD_ID128_NULL</constant>.</para>
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<xi:include href="version-info.xml" xpointer="v246"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOTCONN</constant></term>
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<listitem><para>The bus is not connected.</para>
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<xi:include href="version-info.xml" xpointer="v246"/></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_bus_set_server()</function>,
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<function>sd_bus_is_server()</function>,
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<function>sd_bus_get_bus_id()</function>,
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<function>sd_bus_set_bus_client()</function>,
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<function>sd_bus_is_bus_client()</function>,
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<function>sd_bus_set_monitor()</function>, and
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<function>sd_bus_is_monitor()</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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</simplelist></para>
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</refsect1>
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</refentry>
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