151 lines
4.0 KiB
HTML
151 lines
4.0 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_BUS_SET_CONNECTED_SIGNAL</TITLE>
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</HEAD><BODY>
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<H1>SD_BUS_SET_CONNECTED_SIGNAL</H1>
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Section: sd_bus_set_connected_signal (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_bus_set_connected_signal, sd_bus_get_connected_signal - Control emmission of local connection establishment signal on bus connections
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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-bus.h">systemd/sd-bus.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>int sd_bus_set_connected_signal(sd_bus *</B><I>bus</I><B>, int </B><I>b</I><B>);</B>
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<DT id="2">
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<B>int sd_bus_get_connected_signal(sd_bus *</B><I>bus</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_bus_set_connected_signal()</B>
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<DD>may be used to control whether a local, synthetic
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<B>Connected()</B>
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signal message shall be generated and enqueued for dispatching when the connection is fully established. If the
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<I>b</I>
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parameter is zero the message is not generated (the default), otherwise it is generated.
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<P>
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<B>sd_bus_get_connected_signal()</B>
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may be used to query whether this feature is enabled. It returns zero if not, positive otherwise.
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<P>
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The
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<B>Connected()</B>
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signal message is generated from the
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"org.freedesktop.DBus.Local"
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service and interface, and
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"/org/freedesktop/DBus/Local"
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object path. Use
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_match_signal_async">sd_bus_match_signal_async</A></B>(3)
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to match on this signal.
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<P>
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This message is particularly useful on slow transports where connections take a long time to be established. This is especially the case when
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_set_watch_bind">sd_bus_set_watch_bind</A></B>(3)
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is used. The signal is generated when the
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_is_ready">sd_bus_is_ready</A></B>(3)
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returns positive for the first time.
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<P>
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The
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<B>Connected()</B>
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signal corresponds with the
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<B>Disconnected()</B>
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signal that is synthesized locally when the connection is terminated. The latter is generated unconditionally however, unlike the former which needs to be enabled explicitly before it is generated, with
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<B>sd_bus_set_connected_signal()</B>.
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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, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code.
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<A NAME="lbAF"> </A>
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<H3>Errors</H3>
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<P>
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Returned errors may indicate the following problems:
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<P>
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<B>-ECHILD</B>
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<DL COMPACT><DT id="3"><DD>
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The bus connection has been created in a different process.
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</DL>
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<A NAME="lbAG"> </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="lbAH"> </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?1+systemd">systemd</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?3+sd-bus">sd-bus</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_match_signal_async">sd_bus_match_signal_async</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_set_watch_bind">sd_bus_set_watch_bind</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sd_bus_is_ready">sd_bus_is_ready</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="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DL>
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<DT id="8"><A HREF="#lbAF">Errors</A><DD>
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</DL>
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<DT id="9"><A HREF="#lbAG">NOTES</A><DD>
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<DT id="10"><A HREF="#lbAH">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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