struct sd_event *(*get_event_loop)(void *closure); /* get the common systemd's event loop */
struct sd_bus *(*get_user_bus)(void *closure); /* get the common systemd's user d-bus */
struct sd_bus *(*get_system_bus)(void *closure); /* get the common systemd's system d-bus */
struct sd_event *(*get_event_loop)(void *closure); /* get the common systemd's event loop */
struct sd_bus *(*get_user_bus)(void *closure); /* get the common systemd's user d-bus */
struct sd_bus *(*get_system_bus)(void *closure); /* get the common systemd's system d-bus */