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1.1       root        1: .\" Copyright (c) 1983, 1986 The Regents of the University of California.
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                     16: .\"    @(#)1.t 6.4 (Berkeley) 3/7/89
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                     18: .\".ds RH Introduction
                     19: .br
                     20: .ne 2i
                     21: .NH
                     22: \s+2Introduction\s0
                     23: .PP
                     24: This report describes the internal structure of
                     25: facilities added to the
                     26: 4.2BSD version of the UNIX operating system for
                     27: the VAX,
                     28: as modified in the 4.3BSD release.
                     29: The system facilities provide
                     30: a uniform user interface to networking
                     31: within UNIX.  In addition, the implementation 
                     32: introduces a structure for network communications which may be
                     33: used by system implementors in adding new networking
                     34: facilities.  The internal structure is not visible
                     35: to the user, rather it is intended to aid implementors
                     36: of communication protocols and network services by
                     37: providing a framework which
                     38: promotes code sharing and minimizes implementation effort.
                     39: .PP
                     40: The reader is expected to be familiar with the C programming
                     41: language and system interface, as described in the
                     42: \fIBerkeley Software Architecture Manual, 4.3BSD Edition\fP [Joy86].
                     43: Basic understanding of network
                     44: communication concepts is assumed; where required
                     45: any additional ideas are introduced.
                     46: .PP
                     47: The remainder of this document
                     48: provides a description of the system internals,
                     49: avoiding, when possible, those portions which are utilized only
                     50: by the interprocess communication facilities.

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