summaryrefslogtreecommitdiffstats
path: root/man/sd_event_source_set_userdata.xml
diff options
context:
space:
mode:
Diffstat (limited to 'man/sd_event_source_set_userdata.xml')
-rw-r--r--man/sd_event_source_set_userdata.xml93
1 files changed, 93 insertions, 0 deletions
diff --git a/man/sd_event_source_set_userdata.xml b/man/sd_event_source_set_userdata.xml
new file mode 100644
index 0000000..e8e5dc1
--- /dev/null
+++ b/man/sd_event_source_set_userdata.xml
@@ -0,0 +1,93 @@
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_event_source_set_userdata" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_event_source_set_userdata</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_event_source_set_userdata</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_event_source_set_userdata</refname>
+ <refname>sd_event_source_get_userdata</refname>
+
+ <refpurpose>Set or retrieve user data pointer of event sources</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-event.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>void* <function>sd_event_source_set_userdata</function></funcdef>
+ <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
+ <paramdef>void *<parameter>userdata</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>void* <function>sd_event_source_get_userdata</function></funcdef>
+ <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_event_source_set_userdata()</function> may be
+ used to set an arbitrary user data pointer for the event source
+ object specified as <parameter>source</parameter>. The user data
+ pointer is usually specified when creating an event source object
+ with calls such as
+ <citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ or
+ <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ and may be updated with this call. The user data pointer is also
+ passed to all handler callback functions associated with the event
+ source. The <parameter>userdata</parameter> parameter specifies
+ the new user data pointer to set, the function returns the
+ previous user data pointer. Note that <constant>NULL</constant> is
+ a valid user data pointer.</para>
+
+ <para><function>sd_event_source_get_userdata()</function> may be
+ used to query the current user data pointer assigned to the event
+ source object <parameter>source</parameter>.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success,
+ <function>sd_event_source_set_userdata()</function> and
+ <function>sd_event_source_get_userdata()</function> return the
+ previously set user data pointer. On failure, they return
+ <constant>NULL</constant>.</para>
+ </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_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_inotify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_source_set_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>