'sd_bus_match_signal',
'sd_bus_match_signal_async'],
''],
+ ['sd_bus_attach_event', '3', ['sd_bus_detach_event', 'sd_bus_get_event'], ''],
+ ['sd_bus_close', '3', ['sd_bus_flush'], ''],
['sd_bus_creds_get_pid',
'3',
['sd_bus_creds_get_audit_login_uid',
'3',
['sd_bus_negotiate_creds', 'sd_bus_negotiate_timestamp'],
''],
- ['sd_bus_new', '3', ['sd_bus_ref', 'sd_bus_unref', 'sd_bus_unrefp'], ''],
+ ['sd_bus_new',
+ '3',
+ ['sd_bus_flush_close_unref',
+ 'sd_bus_flush_close_unrefp',
+ 'sd_bus_ref',
+ 'sd_bus_unref',
+ 'sd_bus_unrefp'],
+ ''],
['sd_bus_path_encode',
'3',
['sd_bus_path_decode', 'sd_bus_path_decode_many', 'sd_bus_path_encode_many'],
<para>See
<literallayout><citerefentry><refentrytitle>sd_bus_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_attach_event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_default</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
--- /dev/null
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ SPDX-License-Identifier: LGPL-2.1+
+-->
+
+<refentry id="sd_bus_attach_event"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_attach_event</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_attach_event</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_attach_event</refname>
+ <refname>sd_bus_detach_event</refname>
+ <refname>sd_bus_get_event</refname>
+
+ <refpurpose>Attach a bus connection object to an event loop</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_attach_event</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ <paramdef>sd_event *<parameter>e</parameter></paramdef>
+ <paramdef>int <parameter>priority</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_detach_event</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>sd_event *<function>sd_bus_get_event</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_bus_attach_event()</function> attaches the specified bus connection object to an
+ <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry> event loop object at
+ the specified priority (see
+ <citerefentry><refentrytitle>sd_event_source_set_priority</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for details on event loop priorities). When a bus connection object is attached to an event loop incoming messages
+ will be automatically read and processed, and outgoing messages written, whenever the event loop is run. When the
+ event loop is about to terminate, the bus connection is automatically flushed and closed (see
+ <citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry> for
+ details on this). By default bus connection objects are not attached to any event loop. When a bus connection
+ object is attached to one it is not necessary to invoke
+ <citerefentry><refentrytitle>sd_bus_wait</refentrytitle><manvolnum>3</manvolnum></citerefentry> or
+ <citerefentry><refentrytitle>sd_bus_process</refentrytitle><manvolnum>3</manvolnum></citerefentry> as this
+ functionality is handled automatically by the event loop.</para>
+
+ <para><function>sd_bus_detach_event()</function> detaches a bus object from its event loop.</para>
+
+ <para>The <function>sd_bus_get_event()</function> returns the event loop object the specified bus object is
+ currently attached to, or <constant>NULL</constant> if it is currently not attached to any.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_bus_attach_event()</function> and <function>sd_bus_detach_event()</function> return
+ 0 or a positive integer. On failure, they return a negative errno-style error code.</para>
+
+ <para><function>sd_bus_get_event()</function> returns an event loop object or <constant>NULL</constant>.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
+
+ <listitem><para>The bus connection has been created in a different process.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </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-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_source_set_priority</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_wait</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
--- /dev/null
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ SPDX-License-Identifier: LGPL-2.1+
+-->
+
+<refentry id="sd_bus_close"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_close</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_close</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_close</refname>
+ <refname>sd_bus_flush</refname>
+
+ <refpurpose>Close and flush a bus connection</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_close</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_flush</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_bus_close()</function> disconnects the specified bus connection. When this call is invoked and
+ the specified bus object refers to an active connection it is immediately terminated. No further messages may be
+ sent or receieved on it. Any messages queued in the bus object (both incoming and outgoing) are released. If
+ invoked on <constant>NULL</constant> bus object or when the bus connection is already closed this function executes
+ no operation. This call does not free or unreference the bus object itself. Use
+ <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> for that.</para>
+
+ <para><function>sd_bus_flush()</function> synchronously writes out all outgoing queued message on a bus connection
+ if there are any. This function call may block if the peer is not processing bus messages quickly.</para>
+
+ <para>Before a program exits it is usually a good idea to flush any pending messages with
+ <function>sd_bus_flush()</function> and then close connections with <function>sd_bus_close()</function> to ensure
+ that no unwritten messages are lost, no further messages may be queued and all incoming but unprocessed messages
+ are released. After both operations have been done, it is a good idea to also drop any remaining references to the
+ bus object so that it may be freed. Since these three operations are frequently done together a helper call
+ <citerefentry><refentrytitle>sd_bus_flush_close_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> is
+ provided that combines them into one.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_bus_flush()</function> returns 0 or a positive integer. On failure, it returns a
+ negative errno-style error code.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
+
+ <listitem><para>The bus connection has been created in a different process.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </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_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
<refname>sd_bus_ref</refname>
<refname>sd_bus_unref</refname>
<refname>sd_bus_unrefp</refname>
+ <refname>sd_bus_flush_close_unref</refname>
+ <refname>sd_bus_flush_close_unrefp</refname>
<refpurpose>Create a new bus object and create or destroy references to it</refpurpose>
</refnamediv>
<funcdef>void <function>sd_bus_unrefp</function></funcdef>
<paramdef>sd_bus **<parameter>busp</parameter></paramdef>
</funcprototype>
+
+ <funcprototype>
+ <funcdef>sd_bus *<function>sd_bus_flush_close_unref</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_flush_close_unrefp</function></funcdef>
+ <paramdef>sd_bus **<parameter>busp</parameter></paramdef>
+ </funcprototype>
</funcsynopsis>
</refsynopsisdiv>
dereference its argument, which must not be <constant>NULL</constant>, and will
execute no operation if <emphasis>that</emphasis> is <constant>NULL</constant>.
</para>
+
+ <para><function>sd_bus_flush_close_unref()</function> is similar to <function>sd_bus_unref()</function>, but first
+ executes <citerefentry><refentrytitle>sd_bus_flush</refentrytitle><manvolnum>3</manvolnum></citerefentry> as well
+ as <citerefentry><refentrytitle>sd_bus_close</refentrytitle><manvolnum>3</manvolnum></citerefentry>, ensuring that
+ any pending messages are properly flushed out before the reference to the connection is dropped and possibly the
+ object freed. This call is particularly useful immediately before exiting from a program as it ensures that any
+ pending outgoing messages are written out, and unprocessed but queued incoming messages released before the
+ connection is terminated and released.</para>
+
+ <para><function>sd_bus_flush_close_unrefp()</function> is similar to
+ <function>sd_bus_flush_close_unref()</function>, but may be used in GCC's and LLVM's Clean-up Variable Attribute,
+ see above.</para>
</refsect1>
<refsect1>
<para><function>sd_bus_ref()</function> always returns the argument.
</para>
- <para><function>sd_bus_unref()</function> always returns
+ <para><function>sd_bus_unref()</function> and <function>sd_bus_flush_close_unref()</function> always return
<constant>NULL</constant>.</para>
</refsect1>
<citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_open_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_bus_open_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>sd_bus_open_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_close</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
projects / thirdparty / systemd.git / commitdiff
