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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2014 Zbigniew Jędrzejewski-Szmek
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="sd_bus_open_user" conditional="ENABLE_KDBUS">
-
- <refentryinfo>
- <title>sd_bus_open_user</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>A monkey with a typewriter</contrib>
- <firstname>Zbigniew</firstname>
- <surname>Jędrzejewski-Szmek</surname>
- <email>zbyszek@in.waw.pl</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd_bus_open_user</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_bus_open_user</refname>
- <refname>sd_bus_open_system</refname>
- <refname>sd_bus_open_system_remote</refname>
- <refname>sd_bus_open_system_container</refname>
-
- <refname>sd_bus_default_user</refname>
- <refname>sd_bus_default_system</refname>
-
- <refpurpose>Open a connection to the system or user bus</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_open_user</function></funcdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_open_system</function></funcdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_open_system_remote</function></funcdef>
- <paramdef>const char *<parameter>host</parameter></paramdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_open_system_container</function></funcdef>
- <paramdef>const char *<parameter>machine</parameter></paramdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_default_user</function></funcdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_default_system</function></funcdef>
- <paramdef>sd_bus **<parameter>bus</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_bus_open_user()</function> creates a new bus
- object and opens a connection to the user bus.
- <function>sd_bus_open_system()</function> does the same, but
- connects to the system bus.</para>
-
- <para>If the <varname>$DBUS_SESSION_BUS_ADDRESS</varname> environment
- variable is set
- (cf. <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>),
- it will be used as the address of the user bus. This variable can
- contain multiple addresses separated by <literal>;</literal>. If
- this variable is not set, a suitable default for the default user
- D-Bus instance will be used.</para>
-
- <para>If the <varname>$DBUS_SYSTEM_BUS_ADDRESS</varname> environment
- variable is set, it will be used as the address of the system
- bus. This variable uses the same syntax as
- <varname>$DBUS_SESSION_BUS_ADDRESS</varname>/. If this variable is
- not set, a suitable default for the default system D-Bus instance
- will be used.</para>
-
- <para><function>sd_bus_open_system_remote()</function> connects to
- the system bus on the specified <parameter>host</parameter> using
- SSH. <parameter>host</parameter> consists of an optional user name
- followed by the <literal>@</literal> symbol, and the hostname.
- </para>
-
- <para><function>sd_bus_open_system_container()</function> connects
- to the system bus in the specified <parameter>machine</parameter>,
- where <parameter>machine</parameter> is the name of a container.
- See
- <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- for more information about "machines".</para>
-
- <para><function>sd_bus_default_user()</function> returns a bus
- object connected to the user bus. Each thread has its own object, but it
- may be passed around. It is created on the first invocation of
- <function>sd_bus_default_user()</function>, and subsequent
- invocations returns a reference to the same object.</para>
-
- <para><function>sd_bus_default_system()</function> is similar to
- <function>sd_bus_default_user()</function>, but connects to the
- system bus.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>On success, these calls return 0 or a positive
- integer. On failure, these calls return a negative
- errno-style error code.</para>
- </refsect1>
-
- <refsect1>
- <title>Reference ownership</title>
- <para>Functions <function>sd_bus_open_user()</function>,
- <function>sd_bus_open_system()</function>,
- <function>sd_bus_open_system_remote()</function>, and
- <function>sd_bus_open_system_machine()</function> return a new
- object and the caller owns the sole reference. When not needed
- anymore, this reference should be destroyed with
- <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
- </para>
-
- <para>The functions <function>sd_bus_default_user()</function> and
- <function>sd_bus_default_system()</function> do not create a new
- reference.</para>
- </refsect1>
-
- <refsect1>
- <title>Errors</title>
-
- <para>Returned errors may indicate the following problems:</para>
-
- <variablelist>
-
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
-
- <listitem><para>Specified parameter is invalid
- (<constant>NULL</constant> in case of output
- parameters).</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ENOMEM</constant></term>
-
- <listitem><para>Memory allocation failed.</para></listitem>
- </varlistentry>
-
- <para>In addition, any further connection-related errors may be
- by returned. See <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para><function>sd_bus_open_user()</function> and other functions
- described here are available as a shared library, which can be
- compiled and linked to with the
- <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- file.</para>
- </refsect1>
-
- <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_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry project='die-net'><refentrytitle>ssh</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>