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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_...D_SIGNAL(3) sd_bus_set_connected_signal SD_BUS_...D_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,
library or module instance.
Functions described here are available as a shared library, which
can be compiled against and linked to with the
libsystemd pkg-config(1) file.
The code described here uses getenv(3), which is declared to be
not multi-thread-safe. This means that the code calling the
functions described here must not call setenv(3) from a parallel
thread. It is recommended to only do calls to setenv() from an
early phase of the program when no other threads have been
started.
sd_bus_set_connected_signal() and sd_bus_get_connected_signal()
were added in version 237.
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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) 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
[email protected]
systemd 257~devel SD_BUS_...D_SIGNAL(3)
Pages that refer to this page: sd-bus(3), sd_bus_is_open(3), sd_bus_set_watch_bind(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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