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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 ...
BitBake – Build automation tool tailored for building Linux distributions; written in Python; Boot – build automation and dependency management tool; written in Clojure; Boost boost.build – For C++ projects, cross-platform, based on Perforce Jam
Systemd's initialization instructions for each daemon are recorded in a declarative configuration file rather than a shell script. For inter-process communication, systemd makes Unix domain sockets and D-Bus available to the running daemons. Systemd is also capable of aggressive parallelization.
Snap is a software packaging and deployment system developed by Canonical for operating systems that use the Linux kernel and the systemd init system. The packages, called snaps, and the tool for using them, snapd, work across a range of Linux distributions [3] and allow upstream software developers to distribute their applications directly to users.
To apply the same static configuration after each boot-up, the PID1-programs are used: System V init executes shell scripts and binary programs, systemd parses its own conf-files (and executes programs).
The syntax of Meson's build description files, the Meson language, borrows from Python, but is not Python. It is designed such that it can be reimplemented in any other language; [9] for example, muon [10] is a C implementation, and Meson++ [11] is a C++ implementation. The dependency on Python is an implementation detail.
The system carries out a number of analysis passes on the script before allowing it to run. Scripts may be executed with one of three backends selected by the --runtime= option. The default is a loadable kernel module , which has the fullest capability to inspect and manipulate any part of the system, and therefore requires most privilege.
It is a follow-on and a significant extension of the Rexx programming language (called here "classic Rexx"), retaining all the features and syntax while adding full object-oriented programming (OOP) capabilities and other new enhancements. Following its classic Rexx influence, ooRexx is designed to be easy to learn, use, and maintain.