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Diffstat (limited to 'src/libsystemd/sd_event_source_set_description.xml')
| -rw-r--r-- | src/libsystemd/sd_event_source_set_description.xml | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/libsystemd/sd_event_source_set_description.xml b/src/libsystemd/sd_event_source_set_description.xml new file mode 100644 index 0000000000..b9488a622f --- /dev/null +++ b/src/libsystemd/sd_event_source_set_description.xml @@ -0,0 +1,170 @@ +<?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 <systemd/sd-event.h></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> |