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- .\".ds RH Introduction
- .br
- .ne 2i
- .NH
- \s+2Introduction\s0
- .PP
- This report describes the internal structure of
- facilities added to the
- 4.2BSD version of the UNIX operating system for
- the VAX,
- as modified in the 4.3BSD release.
- The system facilities provide
- a uniform user interface to networking
- within UNIX. In addition, the implementation
- introduces a structure for network communications which may be
- used by system implementors in adding new networking
- facilities. The internal structure is not visible
- to the user, rather it is intended to aid implementors
- of communication protocols and network services by
- providing a framework which
- promotes code sharing and minimizes implementation effort.
- .PP
- The reader is expected to be familiar with the C programming
- language and system interface, as described in the
- \fIBerkeley Software Architecture Manual, 4.3BSD Edition\fP [Joy86].
- Basic understanding of network
- communication concepts is assumed; where required
- any additional ideas are introduced.
- .PP
- The remainder of this document
- provides a description of the system internals,
- avoiding, when possible, those portions which are utilized only
- by the interprocess communication facilities.
-