1SD_BUS_IS_OPEN(3)               sd_bus_is_open               SD_BUS_IS_OPEN(3)
2
3
4

NAME

6       sd_bus_is_open, sd_bus_is_ready - Check whether the bus connection is
7       open or ready
8

SYNOPSIS

10       #include <systemd/sd-bus.h>
11
12       int sd_bus_is_open(sd_bus *bus);
13
14       int sd_bus_is_ready(sd_bus *bus);
15

DESCRIPTION

17       sd_bus_is_open() checks whether the specified bus connection is open,
18       i.e. in the process of being established, already established or in the
19       process of being torn down. It returns zero when the connection has not
20       been started yet (i.e.  sd_bus_start(3) or some equivalent call has not
21       been invoked yet), or is fully terminated again (for example after
22       sd_bus_close(3)), it returns positive otherwise.
23
24       sd_bus_is_ready() checks whether the specified connection is fully
25       established, i.e. completed the connection and authentication phases of
26       the protocol and received the Hello() method call response, and is not
27       in the process of being torn down again. It returns zero outside of
28       this state, and positive otherwise. Effectively, this function returns
29       positive while regular messages can be sent or received on the
30       connection.
31
32       To be notified when the connection is fully established, use
33       sd_bus_set_connected_signal(3) and install a match for the Connected()
34       signal on the "org.freedesktop.DBus.Local" interface. To be notified
35       when the connection is torn down again, install a match for the
36       Disconnected() signal on the "org.freedesktop.DBus.Local" interface.
37

RETURN VALUE

39       On success, these functions return 0 or a positive integer. On failure,
40       they return a negative errno-style error code.
41
42   Errors
43       Returned errors may indicate the following problems:
44
45       -ECHILD
46           The bus connection has been created in a different process.
47

NOTES

49       These APIs are implemented as a shared library, which can be compiled
50       and linked to with the libsystemd pkg-config(1) file.
51

SEE ALSO

53       systemd(1), sd-bus(3), sd_bus_start(3), sd_bus_close(3),
54       sd_bus_set_connected_signal(3)
55
56
57
58systemd 246                                                  SD_BUS_IS_OPEN(3)
Impressum