systemd - Wikipedia
en.wikipedia.org › wiki › Systemdsystemd is a software suite that provides an array of system components for Linux operating systems. Its main aim is to unify service configuration and behavior across Linux distributions; systemd's primary component is a "system and service manager"—an init system used to bootstrap user space and manage user processes.
How does launchd compare to systemd? - Quora
www.quora.com › How-does-launchd-compare-to-systemdI would say that there are a number of “detailed” differences between launchd and systemd, but perhaps the biggest one is philosophical. Systemd has often been criticized as trying to be “everything to everyone”. It tries to make a lot of assumptions about the services that it is responsible for, including some of the items that you would typically expect the service to know best about itself.
launchd - Wikipedia
https://en.wikipedia.org/wiki/LaunchdThe name of each key under Sockets will be placed into the environment of the job when it is run, and the file descriptor of that socket will be available in that environment variable. This differs from systemd's socket activation in that the name of a socket definition inside of the job configuration is hardcoded into the application. This protocol is less flexible, although it does not, as systemd does, require the daemon to hardcode a starting file descriptor (as of 2014, it is 3).
launchd - Wikipedia
en.wikipedia.org › wiki › Launchdlaunchd is very different from SystemStarter in that it may not actually launch all the daemons at boot time. Key to launchd, and similar to xinetd, is the idea of launch-on-demand daemons. When launchctl scans through the job plists at boot time, it asks launchd to reserve and listen on all of the ports requested by those jobs.