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20 <title>lwres_getnameinfo</title>
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23 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry">
24 <a name="id-1"></a><div class="titlepage"></div>
25 <div class="refnamediv">
27 <p>lwres_getnameinfo — lightweight resolver socket address structure to hostname and
31 <div class="refsynopsisdiv">
33 <div class="funcsynopsis">
34 <pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre>
35 <table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;">
37 <td><code class="funcdef">
39 <b class="fsfunc">lwres_getnameinfo</b>(</code></td>
40 <td>const struct sockaddr *<var class="pdparam">sa</var>, </td>
44 <td>size_t <var class="pdparam">salen</var>, </td>
48 <td>char *<var class="pdparam">host</var>, </td>
52 <td>size_t <var class="pdparam">hostlen</var>, </td>
56 <td>char *<var class="pdparam">serv</var>, </td>
60 <td>size_t <var class="pdparam">servlen</var>, </td>
64 <td>int <var class="pdparam">flags</var><code>)</code>;</td>
67 <div class="funcprototype-spacer"> </div>
70 <div class="refsection">
71 <a name="id-1.7"></a><h2>DESCRIPTION</h2>
73 This function is equivalent to the
74 <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span> function defined in RFC2133.
75 <code class="function">lwres_getnameinfo()</code> returns the
77 <span class="type">struct sockaddr</span> <em class="parameter"><code>sa</code></em> which
79 <em class="parameter"><code>salen</code></em> bytes long. The hostname is of
81 <em class="parameter"><code>hostlen</code></em> and is returned via
82 <em class="parameter"><code>*host.</code></em> The maximum length of the
84 1025 bytes: <code class="constant">NI_MAXHOST</code>.
86 <p> The name of the service associated with the port number in
87 <em class="parameter"><code>sa</code></em> is returned in <em class="parameter"><code>*serv.</code></em>
88 It is <em class="parameter"><code>servlen</code></em> bytes long. The
90 of the service name is <code class="constant">NI_MAXSERV</code> - 32
94 The <em class="parameter"><code>flags</code></em> argument sets the
98 <div class="variablelist"><dl class="variablelist">
99 <dt><span class="term"><code class="constant">NI_NOFQDN</code></span></dt>
101 A fully qualified domain name is not required for local hosts.
102 The local part of the fully qualified domain name is returned
105 <dt><span class="term"><code class="constant">NI_NUMERICHOST</code></span></dt>
107 Return the address in numeric form, as if calling inet_ntop(),
108 instead of a host name.
110 <dt><span class="term"><code class="constant">NI_NAMEREQD</code></span></dt>
112 A name is required. If the hostname cannot be found in the DNS
114 this flag is set, a non-zero error code is returned.
115 If the hostname is not found and the flag is not set, the
116 address is returned in numeric form.
118 <dt><span class="term"><code class="constant">NI_NUMERICSERV</code></span></dt>
120 The service name is returned as a digit string representing the
123 <dt><span class="term"><code class="constant">NI_DGRAM</code></span></dt>
125 Specifies that the service being looked up is a datagram
126 service, and causes getservbyport() to be called with a second
127 argument of "udp" instead of its default of "tcp". This is
129 for the few ports (512-514) that have different services for UDP
137 <div class="refsection">
138 <a name="id-1.8"></a><h2>RETURN VALUES</h2>
139 <p><code class="function">lwres_getnameinfo()</code>
140 returns 0 on success or a non-zero error code if an error occurs.
143 <div class="refsection">
144 <a name="id-1.9"></a><h2>SEE ALSO</h2>
145 <p><span class="citerefentry"><span class="refentrytitle">RFC2133</span></span>,
146 <span class="citerefentry"><span class="refentrytitle">getservbyport</span>(3)</span>,
147 <span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>,
148 <span class="citerefentry"><span class="refentrytitle">lwres_getnameinfo</span>(3)</span>,
149 <span class="citerefentry"><span class="refentrytitle">lwres_getnamebyaddr</span>(3)</span>.
150 <span class="citerefentry"><span class="refentrytitle">lwres_net_ntop</span>(3)</span>.
153 <div class="refsection">
154 <a name="id-1.10"></a><h2>BUGS</h2>
156 RFC2133 fails to define what the nonzero return values of
157 <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span>