import functools
from gi.repository import GObject
from gi.repository import Gio
from gi.repository import GLib


def runloop(func):
    @functools.wraps(func)
    def wrapped(*pargs, **kwargs):
        func(None)

        mc = GLib.main_context_default()
        print(mc)
        ml = GLib.MainLoop.new(mc, True)
        print(ml)

        print("run")
        ml.run()
    return wrapped


@runloop
def main(loop):
    print("main")
    vm = Gio.VolumeMonitor.get()
    for sig in GObject.signal_list_names(Gio.VolumeMonitor):
        print(sig)
        vm.connect(sig, functools.partial(print, sig))


if __name__ == '__main__':
    main()