Berkeley Software Distribution : BSD
Berkeley Software Distribution (BSD) is the name of the UNIX dialects distributed already in the 1970s from the University of California, Berkeley.In its infancy AT&T Bell Laboratories permitted Berkeley and other universities to share the source code to their UNIX operating system. Berkeley used their software as a research base for a variety of investigations into operating system design throughout the 1970s and 1980s. Eventually the sum total of the systems that Berkeley students had developed from scratch for their research had replaced essentially every component of the original UNIX kernel, and in the early 1990s the full Berkeley source code was released publicly with a very generous license called the BSD License.
BSD pioneered many of the advances of modern computing. Berkeley's Unix was the first to include library support for the Internet protocol stacks[?], Berkeley sockets. By integrating sockets with the UNIX operating system file descriptors, users of their library found it almost as easy to read and write data across the network, as it was to put data on a disk. The AT&T laboratory eventually released their own STREAMS library which incorporated much of the same functionality in a software stack with better architectural layers, but the already widely distributed sockets library, together with the unfortunate omission of a function call for polling a set of open sockets (an equivalent of the select call in the Berkeley library), made it difficult to justify porting applications to the new API.
Like AT&T Unix, the BSD kernel is a monolithic kernel, meaning that device drivers in the kernel run in ring 0, the core of the operating system. Early versions of BSD were used to form Sun Microsystems' SunOS, founding the first wave of popular Unix workstations.
Other versions of UNIX that descend from BSD include FreeBSD, NetBSD, OpenBSD, 386BSD, and Darwin (and, hence, Mac OS X).
External link
- A timeline of BSD and Research UNIX can be found online at: ftp://ftp.freebsd.org/pub/FreeBSD/branches/-current/src/share/misc/bsd-family-tree
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in silence; she was determined Catherine should ask her for an
so long, that she almost lost patience; and she was on the point of
spoke.
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"He said he is ready to marry you any day, in spite of everything."
Catherine made no answer to this, and Mrs. Penniman almost lost
information that Morris looked very handsome, but terribly haggard.
"Did he seem sad?" asked her niece.
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this condition the first time, I should not have been even more
disapproved, she felt herself gazing at it. "Where did you see him?"
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