172 lines
3.9 KiB
HTML
172 lines
3.9 KiB
HTML
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<HTML><HEAD><TITLE>Man page of SD_BUS_SLOT_REF</TITLE>
|
|
</HEAD><BODY>
|
|
<H1>SD_BUS_SLOT_REF</H1>
|
|
Section: sd_bus_slot_ref (3)<BR>Updated: <BR><A HREF="#index">Index</A>
|
|
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<A NAME="lbAB"> </A>
|
|
<H2>NAME</H2>
|
|
|
|
sd_bus_slot_ref, sd_bus_slot_unref, sd_bus_slot_unrefp, sd_bus_slot_get_bus - Create and destroy references to a bus slot object
|
|
<A NAME="lbAC"> </A>
|
|
<H2>SYNOPSIS</H2>
|
|
|
|
<P>
|
|
<B>
|
|
</B><PRE>
|
|
#include <<A HREF="file:///usr/include/systemd/sd-bus.h">systemd/sd-bus.h</A>>
|
|
</PRE>
|
|
|
|
|
|
<DL COMPACT>
|
|
<DT id="1">
|
|
<B>sd_bus_slot *sd_bus_slot_ref(sd_bus_slot *</B><I>slot</I><B>);</B>
|
|
|
|
<DT id="2">
|
|
<B>sd_bus_slot *sd_bus_slot_unref(sd_bus_slot *</B><I>slot</I><B>);</B>
|
|
|
|
<DT id="3">
|
|
<B>void sd_bus_slot_unrefp(sd_bus_slot **</B><I>slotp</I><B>);</B>
|
|
|
|
<DT id="4">
|
|
<B>sd_bus *sd_bus_slot_get_bus(sd_bus_slot *</B><I>m</I><B>);</B>
|
|
|
|
</DL>
|
|
<A NAME="lbAD"> </A>
|
|
<H2>DESCRIPTION</H2>
|
|
|
|
<P>
|
|
|
|
<B>sd_bus_slot_ref()</B>
|
|
<DD>increases the reference counter of
|
|
<I>slot</I>
|
|
by one.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_unref()</B>
|
|
decreases the reference counter of
|
|
<I>slot</I>
|
|
by one. Once the reference count has dropped to zero, slot object is destroyed and cannot be used anymore, so further calls to
|
|
<B>sd_bus_slot_ref()</B>
|
|
or
|
|
<B>sd_bus_slot_unref()</B>
|
|
are illegal.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_unrefp()</B>
|
|
is similar to
|
|
<B>sd_bus_slot_unref()</B>
|
|
but takes a pointer to a pointer to an
|
|
<B>sd_bus_slot</B>
|
|
object. This call is useful in conjunction with GCC's and LLVM's
|
|
m[blue]<B>Clean-up Variable Attribute</B>m[]<FONT SIZE="-2">[1]</FONT>. See
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_new">sd_bus_new</A></B>(3)
|
|
for an example how to use the cleanup attribute.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_ref()</B>
|
|
and
|
|
<B>sd_bus_slot_unref()</B>
|
|
execute no operation if the passed in bus object address is
|
|
<B>NULL</B>.
|
|
<B>sd_bus_slot_unrefp()</B>
|
|
will first dereference its argument, which must not be
|
|
<B>NULL</B>, and will execute no operation if
|
|
<I>that</I>
|
|
is
|
|
<B>NULL</B>.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_get_bus()</B>
|
|
returns the bus object that message
|
|
<I>slot</I>
|
|
is attached to.
|
|
<A NAME="lbAE"> </A>
|
|
<H2>RETURN VALUE</H2>
|
|
|
|
<P>
|
|
|
|
<B>sd_bus_slot_ref()</B>
|
|
always returns the argument.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_unref()</B>
|
|
always returns
|
|
<B>NULL</B>.
|
|
<P>
|
|
|
|
<B>sd_bus_slot_get_bus()</B>
|
|
always returns the bus object.
|
|
<A NAME="lbAF"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
<P>
|
|
|
|
These APIs are implemented as a shared library, which can be compiled and linked to with the
|
|
<B>libsystemd</B> <B><A HREF="/cgi-bin/man/man2html?1+pkg-config">pkg-config</A></B>(1)
|
|
file.
|
|
<A NAME="lbAG"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<P>
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?1+systemd">systemd</A></B>(1),
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd-bus">sd-bus</A></B>(3),
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_new">sd_bus_new</A></B>(3),
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_message_new">sd_bus_message_new</A></B>(3),
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_slot_new_signal">sd_bus_slot_new_signal</A></B>(3),
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_call_method_async">sd_bus_call_method_async</A></B>(3)
|
|
<A NAME="lbAH"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
<DL COMPACT>
|
|
<DT id="5"> 1.<DD>
|
|
Clean-up Variable Attribute
|
|
<DL COMPACT><DT id="6"><DD>
|
|
<A HREF="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html</A>
|
|
</DL>
|
|
|
|
<P>
|
|
</DL>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="7"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="8"><A HREF="#lbAC">SYNOPSIS</A><DD>
|
|
<DT id="9"><A HREF="#lbAD">DESCRIPTION</A><DD>
|
|
<DT id="10"><A HREF="#lbAE">RETURN VALUE</A><DD>
|
|
<DT id="11"><A HREF="#lbAF">NOTES</A><DD>
|
|
<DT id="12"><A HREF="#lbAG">SEE ALSO</A><DD>
|
|
<DT id="13"><A HREF="#lbAH">NOTES</A><DD>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:05:55 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|