g_signal_connect (volume_monitor, "drive-disconnected", (GCallback)child_drive_disconnected, union_monitor);
g_signal_connect (volume_monitor, "drive-changed", (GCallback)child_drive_changed, union_monitor);
g_signal_connect (volume_monitor, "drive-eject-button", (GCallback)child_drive_eject_button, union_monitor);
g_signal_connect (volume_monitor, "drive-disconnected", (GCallback)child_drive_disconnected, union_monitor);
g_signal_connect (volume_monitor, "drive-changed", (GCallback)child_drive_changed, union_monitor);
g_signal_connect (volume_monitor, "drive-eject-button", (GCallback)child_drive_eject_button, union_monitor);