2 - Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
3 - Copyright (C) 2000, 2001 Internet Software Consortium.
5 - Permission to use, copy, modify, and/or distribute this software for any
6 - purpose with or without fee is hereby granted, provided that the above
7 - copyright notice and this permission notice appear in all copies.
9 - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 - PERFORMANCE OF THIS SOFTWARE.
17 <!-- $Id: lwres_getnameinfo.html,v 1.23.418.1.10.1 2010/03/03 22:06:39 marka Exp $ -->
20 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
21 <title>lwres_getnameinfo</title>
22 <meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
24 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
25 <a name="id2476267"></a><div class="titlepage"></div>
26 <div class="refnamediv">
28 <p>lwres_getnameinfo — lightweight resolver socket address structure to hostname and
32 <div class="refsynopsisdiv">
34 <div class="funcsynopsis">
35 <pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre>
36 <table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
38 <td><code class="funcdef">
40 <b class="fsfunc">lwres_getnameinfo</b>(</code></td>
41 <td>const struct sockaddr * </td>
43 <var class="pdparam">sa</var>, </td>
49 <var class="pdparam">salen</var>, </td>
55 <var class="pdparam">host</var>, </td>
61 <var class="pdparam">hostlen</var>, </td>
67 <var class="pdparam">serv</var>, </td>
73 <var class="pdparam">servlen</var>, </td>
79 <var class="pdparam">flags</var><code>)</code>;</td>
84 <div class="refsect1" lang="en">
85 <a name="id2543390"></a><h2>DESCRIPTION</h2>
87 This function is equivalent to the
88 <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span> function defined in RFC2133.
89 <code class="function">lwres_getnameinfo()</code> returns the
91 <span class="type">struct sockaddr</span> <em class="parameter"><code>sa</code></em> which
93 <em class="parameter"><code>salen</code></em> bytes long. The hostname is of
95 <em class="parameter"><code>hostlen</code></em> and is returned via
96 <em class="parameter"><code>*host.</code></em> The maximum length of the
98 1025 bytes: <code class="constant">NI_MAXHOST</code>.
100 <p> The name of the service associated with the port number in
101 <em class="parameter"><code>sa</code></em> is returned in <em class="parameter"><code>*serv.</code></em>
102 It is <em class="parameter"><code>servlen</code></em> bytes long. The
104 of the service name is <code class="constant">NI_MAXSERV</code> - 32
108 The <em class="parameter"><code>flags</code></em> argument sets the
112 <div class="variablelist"><dl>
113 <dt><span class="term"><code class="constant">NI_NOFQDN</code></span></dt>
115 A fully qualified domain name is not required for local hosts.
116 The local part of the fully qualified domain name is returned
119 <dt><span class="term"><code class="constant">NI_NUMERICHOST</code></span></dt>
121 Return the address in numeric form, as if calling inet_ntop(),
122 instead of a host name.
124 <dt><span class="term"><code class="constant">NI_NAMEREQD</code></span></dt>
126 A name is required. If the hostname cannot be found in the DNS
128 this flag is set, a non-zero error code is returned.
129 If the hostname is not found and the flag is not set, the
130 address is returned in numeric form.
132 <dt><span class="term"><code class="constant">NI_NUMERICSERV</code></span></dt>
134 The service name is returned as a digit string representing the
137 <dt><span class="term"><code class="constant">NI_DGRAM</code></span></dt>
139 Specifies that the service being looked up is a datagram
140 service, and causes getservbyport() to be called with a second
141 argument of "udp" instead of its default of "tcp". This is
143 for the few ports (512-514) that have different services for UDP
151 <div class="refsect1" lang="en">
152 <a name="id2543532"></a><h2>RETURN VALUES</h2>
153 <p><code class="function">lwres_getnameinfo()</code>
154 returns 0 on success or a non-zero error code if an error occurs.
157 <div class="refsect1" lang="en">
158 <a name="id2543544"></a><h2>SEE ALSO</h2>
159 <p><span class="citerefentry"><span class="refentrytitle">RFC2133</span></span>,
160 <span class="citerefentry"><span class="refentrytitle">getservbyport</span>(3)</span>,
161 <span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>,
162 <span class="citerefentry"><span class="refentrytitle">lwres_getnameinfo</span>(3)</span>,
163 <span class="citerefentry"><span class="refentrytitle">lwres_getnamebyaddr</span>(3)</span>.
164 <span class="citerefentry"><span class="refentrytitle">lwres_net_ntop</span>(3)</span>.
167 <div class="refsect1" lang="en">
168 <a name="id2543602"></a><h2>BUGS</h2>
170 RFC2133 fails to define what the nonzero return values of
171 <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span>