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206 lines
8.7 KiB
XML
206 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_address"
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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_address</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_address</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_address</refname>
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<refname>sd_bus_get_address</refname>
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<refname>sd_bus_set_exec</refname>
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<refpurpose>Set or query the address of the bus connection</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_address</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>address</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_address</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char **<parameter>address</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_set_exec</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>char *const *<parameter>argv</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_address()</function> configures a list of addresses of bus brokers to try to
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connect to from a subsequent
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<citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry> call.
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The argument is a <literal>;</literal>-separated list of addresses to try. Each item must be one of the
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following:
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</para>
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<itemizedlist>
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<listitem>
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<para>A unix socket address specified as
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<literal>unix:guid=<replaceable>guid</replaceable>,path=<replaceable>path</replaceable></literal> or
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<literal>unix:guid=<replaceable>guid</replaceable>,abstract=<replaceable>path</replaceable></literal>.
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Exactly one of the <varname>path=</varname> and <varname>abstract=</varname> keys must be present,
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while <varname>guid=</varname> is optional.</para>
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</listitem>
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<listitem>
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<para>A TCP socket address specified as
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<literal>tcp:[guid=<replaceable>guid</replaceable>,][host=<replaceable>host</replaceable>][,port=<replaceable>port</replaceable>][,family=<replaceable>family</replaceable>]</literal>.
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One or both of the <varname>host=</varname> and <varname>port=</varname> keys must be present, while
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the rest is optional. <replaceable>family</replaceable> may be either <option>ipv4</option> or
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<option>ipv6</option>.</para>
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</listitem>
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<listitem>
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<para>An executable to spawn specified as
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<literal>unixexec:guid=<replaceable>guid</replaceable>,path=<replaceable>path</replaceable>,argv1=<replaceable>argument</replaceable>,argv2=<replaceable>argument</replaceable>,...</literal>.
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The <varname>path=</varname> key must be present, while <varname>guid=</varname> is optional.</para>
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</listitem>
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<listitem>
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<para>A machine (container) to connect to specified as
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<literal>x-machine-unix:guid=<replaceable>guid</replaceable>,machine=<replaceable>machine</replaceable>,pid=<replaceable>pid</replaceable></literal>.
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Exactly one of the <varname>machine=</varname> and <varname>pid=</varname> keys must be present,
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while <varname>guid=</varname> is optional. <parameter>machine</parameter> is the name of a local
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container. See
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<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry> for
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more information about the "machine" concept. <literal>machine=.host</literal> may be used to specify
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the host machine. A connection to the standard system bus socket inside of the specified machine will
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be created.</para>
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</listitem>
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</itemizedlist>
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<para>In all cases, parameter <parameter>guid</parameter> is an identifier of the remote peer, in the
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syntax accepted by
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<citerefentry><refentrytitle>sd_id128_from_string</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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If specified, the identifier returned by the peer after the connection is established will be checked and
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the connection will be rejected in case of a mismatch.</para>
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<para>Note that the addresses passed to <function>sd_bus_set_address()</function> may not be verified
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immediately. If they are invalid, an error may be returned e.g. from a subsequent call to
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<citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_get_address()</function> returns any previously set addresses. In addition to
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being explicitly set by <function>sd_bus_set_address()</function>, the address will also be set
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automatically by
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<citerefentry><refentrytitle>sd_bus_open</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
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similar calls, based on environment variables or built-in defaults.</para>
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<para><function>sd_bus_set_exec()</function> is a shorthand function for setting a
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<literal>unixexec</literal> address that spawns the given executable with the given arguments.
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If <parameter>argv</parameter> is <constant>NULL</constant>, the given executable is spawned
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without any extra arguments.</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 negative
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errno-style error code.</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>-EINVAL</constant></term>
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<listitem><para>The input parameters <parameter>bus</parameter> or <parameter>address</parameter> are <constant>NULL</constant>.
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</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 object <parameter>bus</parameter> could not be resolved.</para>
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<xi:include href="version-info.xml" xpointer="v246"/>
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</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 input parameter <parameter>bus</parameter> is in a wrong state
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(<function>sd_bus_set_address()</function> may only be called once on a newly-created bus object).</para>
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<xi:include href="version-info.xml" xpointer="v246"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ECHILD</constant></term>
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<listitem><para>The bus object <parameter>bus</parameter> was created in a different
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process.</para>
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<xi:include href="version-info.xml" xpointer="v246"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENODATA</constant></term>
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<listitem><para>The bus object <parameter>bus</parameter> has no address configured.</para>
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<xi:include href="version-info.xml" xpointer="v246"/>
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</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_address()</function>,
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<function>sd_bus_get_address()</function>, and
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<function>sd_bus_set_exec()</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>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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