mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-24 21:34:08 +03:00
12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
184 lines
6.5 KiB
XML
184 lines
6.5 KiB
XML
<?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 2015 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_event_run">
|
||
|
||
<refentryinfo>
|
||
<title>sd_event_run</title>
|
||
<productname>systemd</productname>
|
||
|
||
<authorgroup>
|
||
<author>
|
||
<contrib>Developer</contrib>
|
||
<firstname>Tom</firstname>
|
||
<surname>Gundersen</surname>
|
||
<email>teg@jklm.no</email>
|
||
</author>
|
||
</authorgroup>
|
||
</refentryinfo>
|
||
|
||
<refmeta>
|
||
<refentrytitle>sd_event_run</refentrytitle>
|
||
<manvolnum>3</manvolnum>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>sd_event_run</refname>
|
||
<refname>sd_event_loop</refname>
|
||
|
||
<refpurpose>Run libsystemd event loop</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<funcsynopsis>
|
||
<funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_event_run</function></funcdef>
|
||
<paramdef>sd_event *<parameter>event</parameter></paramdef>
|
||
<paramdef>uint64_t <parameter>timeout</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_event_loop</function></funcdef>
|
||
<paramdef>sd_event *<parameter>event</parameter></paramdef>
|
||
</funcprototype>
|
||
</funcsynopsis>
|
||
</refsynopsisdiv>
|
||
|
||
<refsect1>
|
||
<title>Description</title>
|
||
|
||
<para><function>sd_event_run()</function> can be used to run one
|
||
iteration of the event loop of libsystemd. This function waits
|
||
until an event to process is available and dispatches a handler
|
||
for it. Parameter <parameter>timeout</parameter> specifices the
|
||
maximum time (in microseconds) to wait. <constant>(uint64_t)
|
||
-1</constant> may be used to specify an infinite timeout.</para>
|
||
|
||
<para><function>sd_event_loop</function> runs
|
||
<function>sd_event_wait</function> in a loop with a timeout of
|
||
infinity. This makes it suitable for the main event loop of a
|
||
program.</para>
|
||
|
||
<para>The event loop object <parameter>event</parameter> is
|
||
created with
|
||
<function>sd_event_new</function>.
|
||
Events to wait for and their handlers can be registered with
|
||
<function>sd_event_add_time</function>,
|
||
<function>sd_event_add_child</function>,
|
||
<function>sd_event_add_signal</function>,
|
||
<function>sd_event_add_defer</function>,
|
||
<function>sd_event_add_exit</function>,
|
||
and
|
||
<function>sd_event_add_post</function>.
|
||
</para>
|
||
|
||
<para>For more fine-grained control,
|
||
<function>sd_event_prepare</function>,
|
||
<function>sd_event_wait</function>, and
|
||
<function>sd_event_dispatch</function> may be used. Along with
|
||
<function>sd_event_get_fd</function>, those functions make it
|
||
possible to integrate the libsystemd loop inside of another event
|
||
loop.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Return Value</title>
|
||
|
||
<para>On success, these functions return 0 or a positive integer.
|
||
On failure, they return a negative errno-style error code.
|
||
<function>sd_event_run</function> returns 0 if the event loop is
|
||
finished, and a positive value if it can be continued.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Errors</title>
|
||
|
||
<para>Returned errors may indicate the following problems:</para>
|
||
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term><constant>-EINVAL</constant></term>
|
||
|
||
<listitem><para>Parameter <parameter>event</parameter> is
|
||
<constant>NULL</constant>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><constant>-EBUSY</constant></term>
|
||
|
||
<listitem><para>The event loop object is not in the right
|
||
state (see
|
||
<citerefentry><refentrytitle>sd_event_prepare</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
for an explanation of possible states).</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>
|
||
|
||
<para>Other errors are possible too.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Notes</title>
|
||
|
||
<para><function>sd_event_run()</function> and
|
||
<function>sd_event_loop()</function> 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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>sd_event_wait</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>sd_event_add_io</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_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>sd_event_add_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>sd_event_add_post</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<ulink url="https://developer.gnome.org/glib/unstable/glib-The-Main-Event-Loop.html">GLIb Main Event Loop</ulink>.
|
||
</para>
|
||
</refsect1>
|
||
|
||
</refentry>
|