- pid_is_unwaited() → pidref_is_unwaited()
- pid_is_alive() → pidref_is_alive()
- unit_watch_pid() → unit_watch_pidref()
- - actually wait for POLLIN on piref's pidfd in service logic
+ - actually wait for POLLIN on pidref's pidfd in service logic
- exec_spawn()
- serialization of control/main pid in service, socket, mount, swap units
- - unit_fork_and_watch_rm_rf()
- cg_pid_get_unit()
- openpt_allocate_in_namespace()
- scope dbus PIDs property needs to gain PIDFDs companion