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Annotation of 43BSDReno/share/doc/smm/15.net/4.t, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983, 1986 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted
        !             5: .\" provided that the above copyright notice and this paragraph are
        !             6: .\" duplicated in all such forms and that any documentation,
        !             7: .\" advertising materials, and other materials related to such
        !             8: .\" distribution and use acknowledge that the software was developed
        !             9: .\" by the University of California, Berkeley.  The name of the
        !            10: .\" University may not be used to endorse or promote products derived
        !            11: .\" from this software without specific prior written permission.
        !            12: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            13: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            14: .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            15: .\"
        !            16: .\"    @(#)4.t 6.4 (Berkeley) 3/7/89
        !            17: .\"
        !            18: .nr H2 1
        !            19: .\".ds RH "Address representation
        !            20: .br
        !            21: .ne 2i
        !            22: .NH
        !            23: \s+2Internal address representation\s0
        !            24: .PP
        !            25: Common to all portions of the system are two data structures.
        !            26: These structures are used to represent
        !            27: addresses and various data objects.
        !            28: Addresses, internally are described by the \fIsockaddr\fP structure,
        !            29: .DS
        !            30: ._f
        !            31: struct sockaddr {
        !            32:        short   sa_family;      /* data format identifier */
        !            33:        char    sa_data[14];    /* address */
        !            34: };
        !            35: .DE
        !            36: All addresses belong to one or more \fIaddress families\fP
        !            37: which define their format and interpretation.
        !            38: The \fIsa_family\fP field indicates the address family to which the address
        !            39: belongs, and the \fIsa_data\fP field contains the actual data value.
        !            40: The size of the data field, 14 bytes, was selected based on a study
        !            41: of current address formats.*
        !            42: Specific address formats use private structure definitions
        !            43: that define the format of the data field.
        !            44: The system interface supports larger address structures,
        !            45: although address-family-independent support facilities, for example routing
        !            46: and raw socket interfaces, provide only 14 bytes for address storage.
        !            47: Protocols that do not use those facilities (e.g, the current Unix domain)
        !            48: may use larger data areas.
        !            49: .FS
        !            50: * Later versions of the system may support variable length addresses.
        !            51: .FE

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