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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_BUS_SET_CONNECTED_SIGNAL(3)s_set_connected_signal_SET_CONNECTED_SIGNAL(3)
sd_bus_set_connected_signal, sd_bus_get_connected_signal - Control
emission of local connection establishment signal on bus connections
#include <systemd/sd-bus.h>
int sd_bus_set_connected_signal(sd_bus *bus, int b);
int sd_bus_get_connected_signal(sd_bus *bus);
sd_bus_set_connected_signal() may be used to control whether a local,
synthetic Connected() signal message shall be generated and enqueued
for dispatching when the connection is fully established. If the b
parameter is zero the message is not generated (the default),
otherwise it is generated.
sd_bus_get_connected_signal() may be used to query whether this
feature is enabled. It returns zero if not, positive otherwise.
The Connected() signal message is generated from the
"org.freedesktop.DBus.Local" service and interface, and
"/org/freedesktop/DBus/Local" object path. Use
sd_bus_match_signal_async(3) to match on this signal.
This message is particularly useful on slow transports where
connections take a long time to be established. This is especially
the case when sd_bus_set_watch_bind(3) is used. The signal is
generated when the sd_bus_is_ready(3) returns positive for the first
time.
The Connected() signal corresponds with the Disconnected() 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
sd_bus_set_connected_signal().
On success, these functions return 0 or a positive integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-ECHILD
The bus connection has been created in a different process.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-bus(3), sd_bus_match_signal_async(3),
sd_bus_set_watch_bind(3), sd_bus_is_ready(3)
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-09-18. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-09-18.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
systemd 246 SD_BUS_SET_CONNECTED_SIGNAL(3)
Pages that refer to this page: sd-bus(3), sd_bus_get_watch_bind(3), sd_bus_is_open(3), sd_bus_is_ready(3), sd_bus_set_watch_bind(3), 30-systemd-environment-d-generator(7), systemd.directives(7), systemd.index(7)
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