84 lines
5.2 KiB
HTML
84 lines
5.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Socket network functions" />
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<meta name="abstract" content="Socket network functions allow application programs to obtain information from the host, protocol, service, and network files." />
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<meta name="description" content="Socket network functions allow application programs to obtain information from the host, protocol, service, and network files." />
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<meta name="DC.Relation" scheme="URI" content="aconcepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="characteristics.htm" />
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<meta name="DC.Relation" scheme="URI" content="xthread.htm" />
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<meta name="DC.Relation" scheme="URI" content="dns.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/unix8a.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/ghostnm.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/getaddrinfo.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/ghosta.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/getnameinfo.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="routines" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Socket network functions</title>
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</head>
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<body id="routines"><a name="routines"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Socket network functions</h1>
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<div><p>Socket network functions allow application programs to obtain information
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from the host, protocol, service, and network files.</p>
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<div class="section"><p>The information can be accessed by name or by address, or by sequential
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access of the file. These network functions (or routines) are required when
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setting up communications between programs that run across networks, and thus
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are not used by AF_UNIX sockets.</p>
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</div>
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<div class="section"><p>The routines are as follows:</p>
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<ul><li>Map host names to network addresses.</li>
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<li>Map network names to network numbers. </li>
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<li>Map protocol names to protocol numbers. </li>
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<li>Map service names to port numbers.</li>
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<li>Convert the byte order of Internet network addresses.</li>
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<li>Convert IP address and dotted decimal notation.</li>
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</ul>
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</div>
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<div class="section"><p>Included in the network routines is a group of routines called
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resolver routines. These routines make, send, and interpret packets for name
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servers in the Internet domain and are also used to do name resolution. The
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resolver routines normally get called by <span class="apiname">gethostbyname()</span>, <span class="apiname">gethostbyaddr()</span>, <span class="apiname">getnameinfo()</span>,
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and <span class="apiname">getaddrinfo()</span> but can be called directly. Primarily
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resolver routines are used for accessing Domain Name System (DNS) through
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socket application. </p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="aconcepts.htm" title="Advanced socket concepts go beyond a general discussion of what sockets are and how they work. They provide ways to design socket applications for larger and more complex networks.">Advanced socket concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="characteristics.htm" title="Sockets share some common characteristics.">Socket characteristics</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="xthread.htm" title="Here is an example of a program that uses gethostbyaddr_r().">Example: Use gethostbyaddr_r() for threadsafe network routines</a></div>
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<div><a href="dns.htm" title="iSeries provides applications with access to the Domain Name System (DNS) through the resolver functions.">Domain Name System support</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../apis/unix8a.htm">Sockets Network Functions (Routines)</a></div>
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<div><a href="../apis/ghostnm.htm">gethostbyname()</a></div>
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<div><a href="../apis/getaddrinfo.htm">getaddrinfo()</a></div>
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<div><a href="../apis/ghosta.htm">gethostbyaddr()</a></div>
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<div><a href="../apis/getnameinfo.htm">getnameinfo()</a></div>
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</div>
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</div>
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</body>
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</html>
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