sd_bus_is_ready(3) — Linux manual page


SD_BUS_IS_OPEN(3)              sd_bus_is_open              SD_BUS_IS_OPEN(3)

NAME         top

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

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       int sd_bus_is_open(sd_bus *bus);

       int sd_bus_is_ready(sd_bus *bus);

DESCRIPTION         top

       sd_bus_is_open() checks whether the specified bus connection is open,
       i.e. in the process of being established, already established or in
       the process of being torn down. It returns zero when the connection
       has not been started yet (i.e.  sd_bus_start(3) or some equivalent
       call has not been invoked yet), or is fully terminated again (for
       example after sd_bus_close(3)), it returns positive otherwise.

       sd_bus_is_ready() checks whether the specified connection is fully
       established, i.e. completed the connection and authentication phases
       of the protocol and received the Hello() method call response, and is
       not in the process of being torn down again. It returns zero outside
       of this state, and positive otherwise. Effectively, this function
       returns positive while regular messages can be sent or received on
       the connection.

       To be notified when the connection is fully established, use
       sd_bus_set_connected_signal(3) and install a match for the
       Connected() signal on the "org.freedesktop.DBus.Local" interface. To
       be notified when the connection is torn down again, install a match
       for the Disconnected() signal on the "org.freedesktop.DBus.Local"

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_start(3), sd_bus_close(3),

COLOPHON         top

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systemd 247                                                SD_BUS_IS_OPEN(3)

Pages that refer to this page: sd_bus_get_connected_signal(3)sd_bus_get_watch_bind(3)sd_bus_set_connected_signal(3)sd_bus_set_watch_bind(3)30-systemd-environment-d-generator(7)systemd.index(7)