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The names FreeBSD and OpenBSD are references to software freedom: both in cost and open source. [42] NetBSD's name is a tribute to the Internet, which brought the original developers together. [43] The first BSD mascot was the BSD daemon, named after a common type of Unix software program, a daemon.
This is an operating system in which the time taken to process an input stimulus is less than the time lapsed until ... BSD: open source: ... Linux user mode ...
Linux distributions that have highly modified kernels — for example, real-time computing kernels — should be listed separately. There are also a wide variety of minor BSD operating systems, many of which can be found at comparison of BSD operating systems .
Because of the large number and variety of available Linux distributions, they are all grouped under a single entry; see comparison of Linux distributions for a detailed comparison. There is also a variety of BSD and DOS operating systems, covered in comparison of BSD operating systems and comparison of DOS operating systems.
Since then, BSD Unix has been developed in several different product branches, including OpenBSD and DragonFly BSD. Because of the modular design of the Unix model, sharing components is relatively common: most or all Unix and Unix-like systems include at least some BSD code, while some include GNU utilities in their distributions.
Because this Berkeley Software Distribution (BSD) contained copyrighted AT&T Unix source code, it was only available to organizations with a source code license for Unix from AT&T. Students and faculty at the CSRG audited the software code for the TCP/IP stack, removing all the AT&T intellectual property, and released it to the general public ...
MacPorts (formerly DarwinPorts), Fink, and Homebrew are projects to port UNIX programs to the Darwin operating system and provide package management. In addition, several standard UNIX package managers—such as RPM, pkgsrc, and Portage—have Darwin ports. Some of these operate in their own namespace so as not to interfere with the base system.
A Berkeley socket is an application programming interface (API) for Internet domain sockets and Unix domain sockets, used for inter-process communication (IPC). It is commonly implemented as a library of linkable modules. It originated with the 4.2BSD Unix operating system, which was released in 1983.