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Components of some Linux desktop environments that are daemons include D-Bus, NetworkManager (here called unetwork), PulseAudio (usound), and Avahi.. In multitasking computer operating systems, a daemon (/ ˈ d iː m ən / or / ˈ d eɪ m ən /) [1] is a computer program that runs as a background process, rather than being under the direct control of an interactive user.
During Daemon Rising, AndrAIa saves Matrix from being transported to the Super Computer and is infected by Daemon. After Daemon's defeat, AndrAIa becomes a bridesmaid in Dot's wedding and is last seen with Mouse in the Principal Office catacombs during the beginning of Megabyte's Hunt.
D-Bus (short for "Desktop Bus" [4]) is a message-oriented middleware mechanism that allows communication between multiple processes running concurrently on the same machine. [5] [6] D-Bus was developed as part of the freedesktop.org project, initiated by GNOME developer Havoc Pennington to standardize services provided by Linux desktop environments such as GNOME and KDE.
daemon: Operating systems often start daemons at boot time and serve the function of responding to network requests, hardware activity, or other programs by performing some task. Daemons can also configure hardware (like udevd on some Linux systems), run scheduled tasks (like cron ), and perform a variety of other tasks.
systemd is the first daemon to start during booting and the last daemon to terminate during shutdown. The systemd daemon serves as the root of the user space's process tree; the first process (PID 1) has a special role on Unix systems, as it replaces the parent of a process when the original parent terminates. Therefore, the first process is ...
The init system is the first daemon to start (during booting) and the last daemon to terminate (during shutdown). Historically this was the "SysV init", which was just called "init". More recent Linux distributions are likely to use one of the more modern alternatives such as systemd. Below is a summary of the main init processes:
This behavior is enforced in some variations of cron, such as that provided in Debian, [8] so that simply restarting the daemon does not re-run @reboot jobs. @reboot can be useful if there is a need to start up a server or daemon under a particular user, and the user does not have access to configure init to start the program.
Although systemd is, as of 2016, used by default in most major Linux distributions, runlevels can still be used through the means provided by the sysvinit project. After the Linux kernel has booted, the /sbin/init program reads the /etc/inittab file to determine the behavior for each runlevel.