+++ /dev/null
-<?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
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- Lesser General Public License for more details.
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- 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_event_add_defer" conditional="ENABLE_KDBUS">
-
- <refentryinfo>
- <title>sd_event_add_defer</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>More text</contrib>
- <firstname>Zbigniew</firstname>
- <surname>Jędrzejewski-Szmek</surname>
- <email>zbyszek@in.waw.pl</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd_event_add_defer</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_event_add_defer</refname>
- <refname>sd_event_add_post</refname>
- <refname>sd_event_add_exit</refname>
-
- <refpurpose>Add static event sources to an event loop</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_event_add_defer</function></funcdef>
- <paramdef>sd_event *<parameter>event</parameter></paramdef>
- <paramdef>sd_event_source **<parameter>source</parameter></paramdef>
- <paramdef>sd_event_handler_t <parameter>handler</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_event_add_post</function></funcdef>
- <paramdef>sd_event *<parameter>event</parameter></paramdef>
- <paramdef>sd_event_source **<parameter>source</parameter></paramdef>
- <paramdef>sd_event_handler_t <parameter>handler</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_event_add_exit</function></funcdef>
- <paramdef>sd_event *<parameter>event</parameter></paramdef>
- <paramdef>sd_event_source **<parameter>source</parameter></paramdef>
- <paramdef>sd_event_handler_t <parameter>handler</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>typedef int (*<function>sd_event_handler_t</function>)</funcdef>
- <paramdef>sd_event_source *<parameter>s</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>Those three functions add new event sources to an event loop
- object. The event loop is specified in
- <parameter>event</parameter>, the event source is returned in the
- <parameter>source</parameter> parameter. The event sources are
- enabled statically and will "fire" when the event loop is run and
- the conditions described below are met. The handler function will
- be passed the <parameter>userdata</parameter> pointer, which may
- be chosen freely by the caller.</para>
-
- <para><function>sd_event_add_defer()</function> adds a new event
- source that will "fire" the next time the event loop is run. By
- default, the handler will be called once
- (<constant>SD_EVENT_ONESHOT</constant>).</para>
-
- <para><function>sd_event_add_post()</function> adds a new event
- source that will "fire" if any event handlers are invoked whenever
- the event loop is run. By default, the source is enabled
- permanently (<constant>SD_EVENT_ON</constant>).</para>
-
- <para><function>sd_event_add_exit()</function> adds a new event
- source that will "fire" when the event loop is terminated
- with <function>sd_event_exit()</function>.</para>
-
- <para>The
- <citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- function may be used to enable the event source permanently
- (<constant>SD_EVENT_ON</constant>) or to make it fire just once
- (<constant>SD_EVENT_ONESHOT</constant>). If the handler function
- returns a negative error code, it will be disabled after the
- invocation, even if <constant>SD_EVENT_ON</constant> mode is
- set.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>On success, this functions return 0 or a positive
- integer. On failure, they return 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>-ENOMEM</constant></term>
-
- <listitem><para>Not enough memory to allocate an object.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
-
- <listitem><para>An invalid argument has been passed.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ESTALE</constant></term>
-
- <listitem><para>The event loop is already terminated.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ECHILD</constant></term>
-
- <listitem><para>The event loop has been created in a different process.</para></listitem>
- </varlistentry>
-
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>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-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>
~ianmdlvl / elogind.git / blobdiff