121 lines
3.5 KiB
HTML
121 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SD_EVENT_SOURCE_SET_USERDATA</TITLE>
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</HEAD><BODY>
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<H1>SD_EVENT_SOURCE_SET_USERDATA</H1>
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Section: sd_event_source_set_userdata (3)<BR>Updated: <BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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sd_event_source_set_userdata, sd_event_source_get_userdata - Set or retrieve user data pointer of event sources
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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<B>
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</B><PRE>
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#include <<A HREF="file:///usr/include/systemd/sd-event.h">systemd/sd-event.h</A>>
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</PRE>
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<DL COMPACT>
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<DT id="1">
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<B>void* sd_event_source_set_userdata(sd_event_source *</B><I>source</I><B>, void *</B><I>userdata</I><B>);</B>
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<DT id="2">
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<B>void* sd_event_source_get_userdata(sd_event_source *</B><I>source</I><B>);</B>
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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<B>sd_event_source_set_userdata()</B>
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<DD>may be used to set an arbitrary user data pointer for the event source object specified as
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<I>source</I>. The user data pointer is usually specified when creating an event source object with calls such as
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_io">sd_event_add_io</A></B>(3)
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or
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_time">sd_event_add_time</A></B>(3), 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
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<I>userdata</I>
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parameter specifies the new user data pointer to set, the function returns the previous user data pointer. Note that
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<B>NULL</B>
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is a valid user data pointer.
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<P>
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<B>sd_event_source_get_userdata()</B>
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may be used to query the current user data pointer assigned to the event source object
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<I>source</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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<P>
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On success,
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<B>sd_event_source_set_userdata()</B>
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and
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<B>sd_event_source_get_userdata()</B>
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return the previously set user data pointer. On failure, they return NULL.
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<A NAME="lbAF"> </A>
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<H2>NOTES</H2>
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<P>
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These APIs are implemented as a shared library, which can be compiled and linked to with the
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<B>libsystemd</B> <B><A HREF="/cgi-bin/man/man2html?1+pkg-config">pkg-config</A></B>(1)
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file.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?3+sd-event">sd-event</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_io">sd_event_add_io</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_time">sd_event_add_time</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_signal">sd_event_add_signal</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_child">sd_event_add_child</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_inotify">sd_event_add_inotify</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_add_defer">sd_event_add_defer</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_event_source_set_description">sd_event_source_set_description</A></B>(3)
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="3"><A HREF="#lbAB">NAME</A><DD>
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<DT id="4"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="5"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="6"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="7"><A HREF="#lbAF">NOTES</A><DD>
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<DT id="8"><A HREF="#lbAG">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:55 GMT, March 31, 2021
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