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Diffstat (limited to 'man/sd_bus_start.xml')
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diff --git a/man/sd_bus_start.xml b/man/sd_bus_start.xml new file mode 100644 index 0000000..68fe3e0 --- /dev/null +++ b/man/sd_bus_start.xml @@ -0,0 +1,124 @@ +<?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_start" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_bus_start</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_start</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_start</refname> + + <refpurpose>Initiate a bus connection to the D-bus broker daemon + </refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_bus_start</function></funcdef> + <paramdef>sd_bus *<parameter>bus</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_start()</function> connects an existing bus connection object to the D-Bus + broker daemon, usually + <citerefentry project='die-net'><refentrytitle>dbus-daemon</refentrytitle><manvolnum>1</manvolnum></citerefentry> + or + <citerefentry project='mankier'><refentrytitle>dbus-broker</refentrytitle><manvolnum>1</manvolnum></citerefentry>. + The mechanism to use for the connection must be configured before the call to + <function>sd_bus_start()</function>, using one of + <citerefentry><refentrytitle>sd_bus_set_address</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_set_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>, or + <citerefentry><refentrytitle>sd_bus_set_exec</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + <function>sd_bus_start()</function> will open the connection socket or spawn the executable as + needed, and asynchronously start a <function>org.freedesktop.DBus.Hello()</function> call. The + answer to the Hello call will be processed later from + <citerefentry><refentrytitle>sd_bus_process</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If + opening of the connection or queuing of the asynchronous call fail, the connection will be closed with + <citerefentry><refentrytitle>sd_bus_close</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + + <para>In most cases, it is better to use + <citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry> + or related calls instead of the more low-level <function>sd_bus_new()</function> and + <function>sd_bus_start()</function>. The higher-level functions not only allocate a bus object but also + start the connection to a well-known bus in a single function call.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, this function returns a non-negative integer. On failure, it returns a negative + errno-style error code.</para> + + <refsect2 id='errors'> + <title>Errors</title> + + <variablelist> + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>The input parameter <parameter>bus</parameter> is <constant>NULL</constant>. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENOPKG</constant></term> + + <listitem><para>Bus object <parameter>bus</parameter> could not be resolved.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EPERM</constant></term> + + <listitem><para>The input parameter <parameter>bus</parameter> is in a wrong state + (<function>sd_bus_start()</function> may only be called once on a newly-created bus object).</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ECHILD</constant></term> + + <listitem><para>The bus object <parameter>bus</parameter> was created in a different + process.</para> + </listitem> + </varlistentry> + </variablelist> + + <para>In addition, other connection-related errors may be returned. See + <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + </refsect2> + </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_default</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_call_async</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |