846a07b50594e763c2ed57855a6bf97d42cfa32a
If we know that main pid is our child then it's unnecessary to watch all other processes of a unit since in this case we will get SIGCHLD when the main process will exit and will act upon accordingly. So let's watch all processes only if the main process is not our child since in this case we need to detect when the cgroup will become empty in order to figure out when the service becomes dead. This is only needed by cgroupv1.
systemd - System and Service Manager
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