113 lines
5.7 KiB
HTML
113 lines
5.7 KiB
HTML
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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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<meta name="DC.Title" content="AF_INET address family" />
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<meta name="abstract" content="This address family provides interprocess communications between processes that run on the same system or on different systems." />
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<meta name="description" content="This address family provides interprocess communications between processes that run on the same system or on different systems." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>AF_INET address family</title>
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</head>
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<body id="cafinet"><a name="cafinet"><!-- --></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">AF_INET address family</h1>
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<div><p>This address family provides interprocess communications between
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processes that run on the same system or on different systems.</p>
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<div class="section"><p>Addresses for AF_INET sockets are IP addresses and port number.
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You can specify an IP address for an AF_INET socket either as an IP address,
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such as 130.99.128.1, or in its 32–bit form, X'82638001'. </p>
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</div>
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<div class="section"><p>For a socket application that uses the Internet Protocol version
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4 (IPv4), the AF_INET address family uses the <span class="apiname">sockaddr_in</span> address
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structure. When you use _XOPEN_SOURCE macro, the AF_INET address structure
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changes to be compatible with BSD 4.4/ UNIX<sup>®</sup> 98 specifications. For the sockaddr_in
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address structure, these differences are summarized in the table:</p>
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</div>
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<div class="section"><div class="p">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Differences between BSD 4.3 and BSD 4.4/ UNIX 98 for sockaddr_in
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address structure</caption><thead align="left"><tr><th valign="top" id="d0e41">BSD 4.3 sockaddr_in address structure</th>
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<th valign="top" id="d0e43">BSD 4.4/ UNIX 98 sockaddr_in address structure</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e41 "> <pre>struct sockaddr_in {
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short sin_family;
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u_short sin_port;
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struct in_addr sin_addr;
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char sin_zero[8];
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};</pre>
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</td>
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<td valign="top" headers="d0e43 "> <pre>struct sockaddr_in {
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uint8_t sin_len;
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sa_family_t sin_family;
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u_short sin_port;
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struct in_addr sin_addr;
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char sin_zero[8];
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};</pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div class="section"><div class="p">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 2. AF_INET address structure </caption><thead align="left"><tr><th valign="top" id="d0e69">Address structure field</th>
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<th valign="top" id="d0e71">Definition</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e69 ">sin_len</td>
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<td valign="top" headers="d0e71 ">This field contains the length of the address for UNIX 98
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specifications. <div class="note"><span class="notetitle">Note:</span> The sin_len field is only provided for
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BSD 4.4 compatibility. It is not necessary to use this field even when using
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BSD 4.4/ UNIX 98
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compatibility. The field is ignored on input addresses.</div>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e69 ">sin_family</td>
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<td valign="top" headers="d0e71 ">This field contains the address family, which is always
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AF_INET when TCP or User Datagram Protocol (UDP) is used.</td>
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</tr>
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<tr><td valign="top" headers="d0e69 ">sin_port</td>
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<td valign="top" headers="d0e71 ">This field contains the port number.</td>
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</tr>
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<tr><td valign="top" headers="d0e69 ">sin_addr</td>
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<td valign="top" headers="d0e71 ">This field contains the IP address.</td>
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</tr>
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<tr><td valign="top" headers="d0e69 ">sin_zero</td>
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<td valign="top" headers="d0e71 ">This field is reserved. Set this field to hexadecimal
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zeros.</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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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="address.htm" title="The address family parameter on a socket() determines the format of the address structure to use on socket functions.">Socket address family</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="uafinet.htm" title="AF_INET address family sockets can be either connection-oriented (type SOCK_STREAM) or they can be connectionless (type SOCK_DGRAM).">Use AF_INET address family</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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