x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_SET_CONNECTED_SIGNAsd_bus_set_connected_sSD_BUS_SET_CONNECTED_SIGNAL(3)
NAME
sd_bus_set_connected_signal, sd_bus_get_connected_signal - Control
emission of local connection establishment signal on bus connections
SYNOPSIS
#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
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().
RETURN VALUE
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.
NOTES
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.
SEE ALSO
systemd(1), sd-bus(3), sd_bus_match_signal_async(3),
sd_bus_set_watch_bind(3), sd_bus_is_ready(3)
systemd 254 SD_BUS_SET_CONNECTED_SIGNAL(3)
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