278 lines
6.9 KiB
HTML
278 lines
6.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>res_findzonecut()--Find the Enclosing Zone and Servers</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Unix8 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Edited by Kersten Feb 02 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>res_findzonecut()--Find the Enclosing Zone and Servers</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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int res_findzonecut(state* <em>res</em>,
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const char *<em>domain_name</em>,
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ns_class <em>class</em>,
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int <em>options</em>,
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char *<em>zone_name</em>,
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size_t <em>zone_size</em>,
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struct in_addr *<em>addresses</em>,
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int <em>num_addresses</em>)
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</pre>
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<br>
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Service Program Name: QSOSRV2<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <em>res_findzonecut()</em> queries name servers until it finds the
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enclosing zone and its master name servers for the specified domain name.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>res</strong></dt>
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<dd>(Input) The pointer to the <strong>state</strong> structure.<br>
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<br>
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</dd>
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<dt><strong>domain_name</strong></dt>
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<dd>(Input) The pointer to the domain name whose enclosing zone is desired.<br>
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<br>
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</dd>
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<dt><strong>class</strong></dt>
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<dd>(Input) The class of <em>domain_name</em>.<br>
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<br>
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</dd>
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<dt><strong>options</strong></dt>
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<dd>(Input) Processing options, may be RES_EXHAUSTIVE.<br>
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<br>
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</dd>
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<dt><strong>zone_name</strong></dt>
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<dd>(Output) The pointer to the enclosing zone name found.<br>
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<br>
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</dd>
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<dt><strong>zonesize</strong></dt>
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<dd>(Input) The size of the zone_name buffer.<br>
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<br>
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</dd>
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<dt><strong>addresses</strong></dt>
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<dd>(Output) The name server addresses found for the enclosing zone.<br>
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<br>
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</dd>
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<dt><strong>num_addresses</strong></dt>
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<dd>(Input) The maximum number of addresses to be returned.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<p><em>res_findzonecut()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>< 0 - (unsuccessful).<br>
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<br>
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</li>
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<li>= 0 - <em>zone_name</em> is now valid, but <em>addresses</em> wasn't
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changed.<br>
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<br>
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</li>
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<li>> 0 - <em>zone_name</em> is now valid, and the return value is number of
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<em>addresses</em> found.</li>
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</ul>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>res_findzonecut()</em> function fails,
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<em>res_findzonecut()</em> can set <em>errno</em> to one of the following:</p>
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<dl>
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<dt><em>[ECONVERT]</em></dt>
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<dd><p>Either the input packet could not be translated
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to ASCII or the answer received could not be translated to the coded character
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set identifier (CCSID) currently in effect for the job.</p></dd>
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<dt><em>[EDESTADDRREQ]</em></dt>
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<dd><p>No zone could be found for the domain.</p></dd>
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<dt><em>[EFAULT]</em></dt>
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<dd><p>The system detected a pointer that was invalid
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while attempting to access an input pointer.</p></dd>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>One of the following reasons:</p>
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<ul>
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<li>An invalid length or NULL pointer was passed to <em>res_findzonecut()</em><br><br></li>
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<li>The <strong>res</strong> appears to be initialized but the reserved field
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is not set to zeros.</li>
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</ul>
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</dd>
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<dd><p><strong>Note:</strong> No attempt is made to initialize the
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<strong>res</strong> structure if it was initialized previous to the
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<em>res_findzonecut()</em> being issued.</p></dd>
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<dt><em>[EMSGSIZE]</em></dt>
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<dd><p>An invalid message length was returned on an
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answer.</p></dd>
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<dt><em>[EPROTOTYPE]</em></dt>
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<dd><p>The answer to a query had the wrong domain
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name.</p></dd>
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</dl>
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<p><strong>Note:</strong> There are numerous other values that <em>errno</em>
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can be set to by the resolver and sockets functions that
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<em>res_findzonecut()</em> calls. Refer to other functions for the other
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values.</p>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li><em>res_findzonecut()</em> calls <em>res_mkquery()</em> and
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<em>res_send()</em> to query the specified server for the zone information.<br>
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<br>
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</li>
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<li><em>res_findzonecut()</em> calls <em>res_ninit()</em> if the
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<strong>res</strong> structure has not been initialized.<br>
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<br>
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</li>
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<li><em>res_findzonecut()</em> assumes that the data passed to it is EBCDIC and
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is in the default coded character set identifier (CCSID) currently in effect
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for the job. It translates the data from the default CCSID currently in effect
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for the job to ASCII (CCSID 819) before the data is sent out to a name server.
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The response that it receives from the name server is returned in the default
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CCSID currently in effect for the job.</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="resnclose.htm">res_nclose()</a>--Close Socket and Reset res
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Structure<br>
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<br>
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</li>
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<li><a href="reshostalias.htm">res_hostalias()</a>--Retrieve the host alias<br>
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<br>
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</li>
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<li><a href="resninit.htm">res_ninit()</a>--Initialize res Structure<br>
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<br>
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</li>
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<li><a href="resnmkquery.htm">res_nmkquery()</a>--Place Domain Query in
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Buffer<br>
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<br>
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</li>
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<li><a href="resnmkupdate.htm">res_nmkupdate()</a>--Construct an Update
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Packet<br>
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<br>
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</li>
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<li><a href="resnquery.htm">res_nquery()</a>--Send Domain Query<br>
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<br>
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</li>
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<li><a href="resnsearch.htm">res_nsearch()</a>--Search for Domain Name<br>
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<br>
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</li>
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<li><a href="resnsend.htm">res_nsend()</a>--Send Buffered Domain Query<br>
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<br>
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</li>
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<li><a href="resnsendsigned.htm">res_nsendsigned()</a>--Send Authenticated Domain
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Query<br>
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<br>
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</li>
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<li><a href="resnupdate.htm">res_nupdate()</a>--Build and Send Dynamic
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Updates<br>
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<br>
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</li>
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<li><a href="resxlt.htm">res_xlate()</a>--Translate DNS Packets</li>
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</ul>
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<br>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a> </td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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