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+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
+ [<!ENTITY mdash "&#8212;">]>
+<!--
+ - Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
+ - Copyright (C) 2000, 2001 Internet Software Consortium.
+ -
+ - Permission to use, copy, modify, and/or distribute this software for any
+ - purpose with or without fee is hereby granted, provided that the above
+ - copyright notice and this permission notice appear in all copies.
+ -
+ - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ - PERFORMANCE OF THIS SOFTWARE.
+-->
+
+<!-- $Id: lwres_getnameinfo.docbook,v 1.10 2007/06/18 23:47:51 tbox Exp $ -->
+<refentry>
+
+ <refentryinfo>
+ <date>Jun 30, 2000</date>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>lwres_getnameinfo</refentrytitle>
+ <manvolnum>3</manvolnum>
+ <refmiscinfo>BIND9</refmiscinfo>
+ </refmeta>
+
+ <docinfo>
+ <copyright>
+ <year>2004</year>
+ <year>2005</year>
+ <year>2007</year>
+ <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
+ </copyright>
+ <copyright>
+ <year>2000</year>
+ <year>2001</year>
+ <holder>Internet Software Consortium.</holder>
+ </copyright>
+ </docinfo>
+
+ <refnamediv>
+ <refname>lwres_getnameinfo</refname>
+ <refpurpose>lightweight resolver socket address structure to hostname and
+ service name
+ </refpurpose>
+ </refnamediv>
+ <refsynopsisdiv>
+ <funcsynopsis>
+<funcsynopsisinfo>#include &lt;lwres/netdb.h&gt;</funcsynopsisinfo>
+<funcprototype>
+ <funcdef>
+int
+<function>lwres_getnameinfo</function></funcdef>
+ <paramdef>const struct sockaddr *<parameter>sa</parameter></paramdef>
+ <paramdef>size_t <parameter>salen</parameter></paramdef>
+ <paramdef>char *<parameter>host</parameter></paramdef>
+ <paramdef>size_t <parameter>hostlen</parameter></paramdef>
+ <paramdef>char *<parameter>serv</parameter></paramdef>
+ <paramdef>size_t <parameter>servlen</parameter></paramdef>
+ <paramdef>int <parameter>flags</parameter></paramdef>
+ </funcprototype>
+</funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>DESCRIPTION</title>
+
+ <para>
+ This function is equivalent to the
+ <citerefentry>
+ <refentrytitle>getnameinfo</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry> function defined in RFC2133.
+ <function>lwres_getnameinfo()</function> returns the
+ hostname for the
+ <type>struct sockaddr</type> <parameter>sa</parameter> which
+ is
+ <parameter>salen</parameter> bytes long. The hostname is of
+ length
+ <parameter>hostlen</parameter> and is returned via
+ <parameter>*host.</parameter> The maximum length of the
+ hostname is
+ 1025 bytes: <constant>NI_MAXHOST</constant>.
+ </para>
+
+ <para> The name of the service associated with the port number in
+ <parameter>sa</parameter> is returned in <parameter>*serv.</parameter>
+ It is <parameter>servlen</parameter> bytes long. The
+ maximum length
+ of the service name is <constant>NI_MAXSERV</constant> - 32
+ bytes.
+ </para>
+
+ <para>
+ The <parameter>flags</parameter> argument sets the
+ following
+ bits:
+ <variablelist>
+ <varlistentry>
+ <term><constant>NI_NOFQDN</constant></term>
+ <listitem>
+ <para>
+ A fully qualified domain name is not required for local hosts.
+ The local part of the fully qualified domain name is returned
+ instead.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>NI_NUMERICHOST</constant></term>
+ <listitem>
+ <para>
+ Return the address in numeric form, as if calling inet_ntop(),
+ instead of a host name.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>NI_NAMEREQD</constant></term>
+ <listitem>
+ <para>
+ A name is required. If the hostname cannot be found in the DNS
+ and
+ this flag is set, a non-zero error code is returned.
+ If the hostname is not found and the flag is not set, the
+ address is returned in numeric form.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>NI_NUMERICSERV</constant></term>
+ <listitem>
+ <para>
+ The service name is returned as a digit string representing the
+ port number.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>NI_DGRAM</constant></term>
+ <listitem>
+ <para>
+ Specifies that the service being looked up is a datagram
+ service, and causes getservbyport() to be called with a second
+ argument of "udp" instead of its default of "tcp". This is
+ required
+ for the few ports (512-514) that have different services for UDP
+ and
+ TCP.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>RETURN VALUES</title>
+ <para><function>lwres_getnameinfo()</function>
+ returns 0 on success or a non-zero error code if an error occurs.
+ </para>
+ </refsect1>
+ <refsect1>
+ <title>SEE ALSO</title>
+ <para><citerefentry>
+ <refentrytitle>RFC2133</refentrytitle>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>getservbyport</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>lwres</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>lwres_getnameinfo</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>lwres_getnamebyaddr</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>.
+ <citerefentry>
+ <refentrytitle>lwres_net_ntop</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>.
+ </para>
+ </refsect1>
+ <refsect1>
+ <title>BUGS</title>
+ <para>
+ RFC2133 fails to define what the nonzero return values of
+ <citerefentry>
+ <refentrytitle>getnameinfo</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>
+ are.
+ </para>
+ </refsect1>
+</refentry><!--
+ - Local variables:
+ - mode: sgml
+ - End:
+-->