1SD_BUS_SET_CONNECTED_SIGNALs(d3_)bus_set_connected_siSgDn_aBlUS_SET_CONNECTED_SIGNAL(3)
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6 sd_bus_set_connected_signal, sd_bus_get_connected_signal - Control
7 emission of local connection establishment signal on bus connections
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10 #include <systemd/sd-bus.h>
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12 int sd_bus_set_connected_signal(sd_bus *bus, int b);
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14 int sd_bus_get_connected_signal(sd_bus *bus);
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17 sd_bus_set_connected_signal() may be used to control whether a local,
18 synthetic Connected() signal message shall be generated and enqueued
19 for dispatching when the connection is fully established. If the b
20 parameter is zero the message is not generated (the default), otherwise
21 it is generated.
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23 sd_bus_get_connected_signal() may be used to query whether this feature
24 is enabled. It returns zero if not, positive otherwise.
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26 The Connected() signal message is generated from the
27 "org.freedesktop.DBus.Local" service and interface, and
28 "/org/freedesktop/DBus/Local" object path. Use
29 sd_bus_match_signal_async(3) to match on this signal.
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31 This message is particularly useful on slow transports where
32 connections take a long time to be established. This is especially the
33 case when sd_bus_set_watch_bind(3) is used. The signal is generated
34 when the sd_bus_is_ready(3) returns positive for the first time.
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36 The Connected() signal corresponds with the Disconnected() signal that
37 is synthesized locally when the connection is terminated. The latter is
38 generated unconditionally however, unlike the former which needs to be
39 enabled explicitly before it is generated, with
40 sd_bus_set_connected_signal().
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43 On success, these functions return 0 or a positive integer. On failure,
44 they return a negative errno-style error code.
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46 Errors
47 Returned errors may indicate the following problems:
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49 -ECHILD
50 The bus connection has been created in a different process.
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53 These APIs are implemented as a shared library, which can be compiled
54 and linked to with the libsystemd pkg-config(1) file.
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57 systemd(1), sd-bus(3), sd_bus_match_signal_async(3),
58 sd_bus_set_watch_bind(3), sd_bus_is_ready(3)
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62systemd 249 SD_BUS_SET_CONNECTED_SIGNAL(3)