launchd

From The Apple Wiki

launchd is the background process used to manage daemons running on the device. It is commanded using launchctl. The source code used to be available, but with OS X 10.10/iOS 8.0 has been moved into the closed source libxpc, and has undergone significant changes (e.g. single process rather than per-user launchd, and improved XPC functionality).

External Links