sd_bus_set_connected_signal(3) — Linux manual page



NAME         top

       sd_bus_set_connected_signal, sd_bus_get_connected_signal - Control
       emission of local connection establishment signal on bus connections

SYNOPSIS         top

       #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);

DESCRIPTION         top

       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

       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

RETURN VALUE         top

       On success, these functions return 0 or a positive integer. On
       failure, they return a negative errno-style error code.

       Returned errors may indicate the following problems:

           The bus connection has been created in a different process.

NOTES         top

       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_match_signal_async(3),
       sd_bus_set_watch_bind(3), sd_bus_is_ready(3)

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, see
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨⟩ 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

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)