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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><netinet/in.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4>NAME</h4><blockquote>netinet/in.h - Internet Protocol family</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <netinet/in.h></code></pre></blockquote><h4>DESCRIPTION</h4><blockquote>When header file<i><netinet/in.h></i>is included, the following types are definedthrough <B>typedef</B>.<p><dl compact><dt><B>in_port_t</B><dd>An unsigned integral type of exactly 16 bits.<dt><B>in_addr_t</B><dd>An unsigned integral type of exactly 32 bits.</dl><p>The<i><a href="netinetin.h.html"><netinet/in.h></a></i>header defines the<B>in_addr</B>structure that includes at least the following member:<pre><code>in_addr_t s_addr</code></pre><p>The<i><a href="netinetin.h.html"><netinet/in.h></a></i>header defines the<B>sockaddr_in</B>structure that includes at least the following member:<pre><code>sa_family_t sin_familyin_port_t sin_portstruct in_addr sin_addrunsigned char sin_zero[8]</code></pre>The<B>sockaddr_in</B>structure is used to store addresses for the Internetprotocol family. Values of this type must be cast to<B>struct sockaddr</B>for use with the socket interfaces defined in this document.<p>The<i><a href="netinetin.h.html"><netinet/in.h></a></i>header defines the type<B>sa_family_t</B>as described in<i><a href="syssocket.h.html"><sys/socket.h></a></i>.<p>The<i><a href="netinetin.h.html"><netinet/in.h></a></i>header defines the following macros for use as values of the <I>level</I>argument of<i><a href="getsockopt.html">getsockopt()</a></i>and<i><a href="setsockopt.html">setsockopt()</a></i>:<dl compact><dt>IPPROTO_IP<dd>Dummy for IP.<dt>IPPROTO_ICMP<dd>Control message protocol.<dt>IPPROTO_TCP<dd>TCP.<dt>IPPROTO_UDP<dd>User datagram protocol.</dl><p>The<i><a href="netinetin.h.html"><netinet/in.h></a></i>header defines the following macros for use as destination addresses for<i><a href="connect.html">connect()</a></i>,<i><a href="sendmsg.html">sendmsg()</a></i>and<i><a href="sendto.html">sendto()</a></i>:<dl compact><dt>INADDR_ANY<dd>Local host address.<dt>INADDR_BROADCAST<dd>Broadcast address.</dl></code><p><i><a href="ntohl.html">ntohl()</a></i>,<i><a href="ntohs.html">ntohs()</a></i>,<i><a href="htonl.html">htonl()</a></i>and <i><a href="htons.html">htons()</a></i>as defined in the description of<i><a href="arpainet.h.html"><arpa/inet.h></a></i>are available.Inclusion of the <i><a href="netinetin.h.html"><netinet/in.h></a></i>header may also make visible all symbols from <i><a href="arpainet.h.html"><arpa/inet.h></a></i>.</blockquote><h4>SEE ALSO</h4><blockquote><i><a href="getsockopt.html">getsockopt()</a></i>,<i><a href="setsockopt.html">setsockopt()</a></i>.<i><a href="syssocket.h.html"><sys/socket.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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