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diff --git a/share/doc/smm/18.net/4.t b/share/doc/smm/18.net/4.t new file mode 100644 index 000000000000..afa6913fcad0 --- /dev/null +++ b/share/doc/smm/18.net/4.t @@ -0,0 +1,67 @@ +.\" Copyright (c) 1983, 1986, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)4.t 8.1 (Berkeley) 6/8/93 +.\" +.nr H2 1 +.\".ds RH "Address representation +.br +.ne 2i +.NH +\s+2Internal address representation\s0 +.PP +Common to all portions of the system are two data structures. +These structures are used to represent +addresses and various data objects. +Addresses, internally are described by the \fIsockaddr\fP structure, +.DS +._f +struct sockaddr { + short sa_family; /* data format identifier */ + char sa_data[14]; /* address */ +}; +.DE +All addresses belong to one or more \fIaddress families\fP +which define their format and interpretation. +The \fIsa_family\fP field indicates the address family to which the address +belongs, and the \fIsa_data\fP field contains the actual data value. +The size of the data field, 14 bytes, was selected based on a study +of current address formats.* +Specific address formats use private structure definitions +that define the format of the data field. +The system interface supports larger address structures, +although address-family-independent support facilities, for example routing +and raw socket interfaces, provide only 14 bytes for address storage. +Protocols that do not use those facilities (e.g, the current Unix domain) +may use larger data areas. +.FS +* Later versions of the system may support variable length addresses. +.FE |