systemd-initctl.service, systemd-initctl.socket, systemd-initctl - /dev/initctl compatibility
systemd-initctl.service
systemd-initctl.socket
/lib/systemd/systemd-initctl
systemd-initctl is a system service that implements compatibility with the /dev/initctl FIFO file system object, as implemented by the SysV init system. systemd-initctl is automatically activated on request and terminates itself when it is unused.
systemd(1)