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-<?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
- 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_source_set_description" xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <refentryinfo>
- <title>sd_event_source_set_description</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_source_set_description</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_event_source_set_description</refname>
- <refname>sd_event_source_get_description</refname>
-
- <refpurpose>Set or retrieve descriptive names of event sources</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-event.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_event_source_set_description</function></funcdef>
- <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
- <paramdef>const char *<parameter>description</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_event_source_get_description</function></funcdef>
- <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
- <paramdef>const char **<parameter>description</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_event_source_set_description()</function> may
- be used to set an arbitrary descriptive name for the event source
- object specified as <parameter>source</parameter>. This name will
- be used in debugging messages generated by
- <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- for this event source, and may be queried using
- <function>sd_event_source_get_description()</function> for
- debugging purposes. The <parameter>description</parameter> parameter shall
- point to a <constant>NUL</constant>-terminated string or be
- <constant>NULL</constant>. In the latter case, the descriptive
- name will be unset. The string is copied internally, hence the
- <parameter>description</parameter> argument is not referenced
- after the function returns.</para>
-
- <para><function>sd_event_source_get_description()</function> may
- be used to query the current descriptive name assigned to the
- event source object <parameter>source</parameter>. It returns a
- pointer to the current name in <parameter>description</parameter>,
- stored in memory internal to the event source. The memory is
- invalidated when the event source is destroyed or the descriptive
- name is changed.</para>
-
- <para>Event source objects generally have no description set when
- they are created, except for UNIX signal event sources created
- with
- <citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- whose descriptive name is initialized to the signal's C constant
- name (e.g. <literal>SIGINT</literal> or
- <literal>SIGTERM</literal>).</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>On success, <function>sd_event_source_set_description()</function> and
- <function>sd_event_source_get_description()</function> return a
- non-negative 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>-EINVAL</constant></term>
-
- <listitem><para><parameter>source</parameter> is not a valid
- pointer to an <structname>sd_event_source</structname>
- object or the <parameter>description</parameter> argument for
- <function>sd_event_source_get_description()</function> is
- <constant>NULL</constant>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ENOMEM</constant></term>
-
- <listitem><para>Not enough memory to copy the
- name.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ECHILD</constant></term>
-
- <listitem><para>The event loop has been created in a different process.</para></listitem>
-
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ENXIO</constant></term>
-
- <listitem><para>No name was set for the event
- source.</para></listitem>
- </varlistentry>
-
- </variablelist>
- </refsect1>
-
- <xi:include href="libsystemd-pkgconfig.xml" />
-
- <refsect1>
- <title>See Also</title>
-
- <para>
- <citerefentry><refentrytitle>sd-event</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_child</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_source_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>