177 lines
6.3 KiB
HTML
177 lines
6.3 KiB
HTML
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<!-- $Id: lwres_getnameinfo.html,v 1.23.418.1 2009/07/11 01:55:21 tbox Exp $ -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>lwres_getnameinfo</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
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<a name="id2476275"></a><div class="titlepage"></div>
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<div class="refnamediv">
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<h2>Name</h2>
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<p>lwres_getnameinfo — lightweight resolver socket address structure to hostname and
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service name
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</p>
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</div>
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<div class="refsynopsisdiv">
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<h2>Synopsis</h2>
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<div class="funcsynopsis">
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<pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre>
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<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<tr>
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<td><code class="funcdef">
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int
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<b class="fsfunc">lwres_getnameinfo</b>(</code></td>
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<td>const struct sockaddr * </td>
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<td>
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<var class="pdparam">sa</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">salen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>char * </td>
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<td>
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<var class="pdparam">host</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">hostlen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>char * </td>
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<td>
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<var class="pdparam">serv</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">servlen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>int </td>
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<td>
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<var class="pdparam">flags</var><code>)</code>;</td>
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</tr>
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</table>
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</div>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543393"></a><h2>DESCRIPTION</h2>
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<p>
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This function is equivalent to the
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<span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span> function defined in RFC2133.
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<code class="function">lwres_getnameinfo()</code> returns the
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hostname for the
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<span class="type">struct sockaddr</span> <em class="parameter"><code>sa</code></em> which
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is
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<em class="parameter"><code>salen</code></em> bytes long. The hostname is of
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length
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<em class="parameter"><code>hostlen</code></em> and is returned via
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<em class="parameter"><code>*host.</code></em> The maximum length of the
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hostname is
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1025 bytes: <code class="constant">NI_MAXHOST</code>.
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</p>
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<p> The name of the service associated with the port number in
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<em class="parameter"><code>sa</code></em> is returned in <em class="parameter"><code>*serv.</code></em>
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It is <em class="parameter"><code>servlen</code></em> bytes long. The
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maximum length
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of the service name is <code class="constant">NI_MAXSERV</code> - 32
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bytes.
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</p>
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<p>
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The <em class="parameter"><code>flags</code></em> argument sets the
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following
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bits:
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</p>
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<div class="variablelist"><dl>
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<dt><span class="term"><code class="constant">NI_NOFQDN</code></span></dt>
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<dd><p>
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A fully qualified domain name is not required for local hosts.
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The local part of the fully qualified domain name is returned
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instead.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NUMERICHOST</code></span></dt>
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<dd><p>
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Return the address in numeric form, as if calling inet_ntop(),
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instead of a host name.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NAMEREQD</code></span></dt>
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<dd><p>
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A name is required. If the hostname cannot be found in the DNS
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and
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this flag is set, a non-zero error code is returned.
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If the hostname is not found and the flag is not set, the
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address is returned in numeric form.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NUMERICSERV</code></span></dt>
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<dd><p>
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The service name is returned as a digit string representing the
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port number.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_DGRAM</code></span></dt>
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<dd><p>
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Specifies that the service being looked up is a datagram
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service, and causes getservbyport() to be called with a second
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argument of "udp" instead of its default of "tcp". This is
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required
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for the few ports (512-514) that have different services for UDP
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and
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TCP.
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</p></dd>
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</dl></div>
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<p>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543534"></a><h2>RETURN VALUES</h2>
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<p><code class="function">lwres_getnameinfo()</code>
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returns 0 on success or a non-zero error code if an error occurs.
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543546"></a><h2>SEE ALSO</h2>
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<p><span class="citerefentry"><span class="refentrytitle">RFC2133</span></span>,
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<span class="citerefentry"><span class="refentrytitle">getservbyport</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres_getnameinfo</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres_getnamebyaddr</span>(3)</span>.
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<span class="citerefentry"><span class="refentrytitle">lwres_net_ntop</span>(3)</span>.
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543604"></a><h2>BUGS</h2>
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<p>
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RFC2133 fails to define what the nonzero return values of
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<span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span>
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are.
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</p>
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</div>
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</div></body>
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</html>
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