215 lines
6.0 KiB
HTML
215 lines
6.0 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>getnetbyaddr_r()--Get Network Information for IP Address</title>
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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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<!-- Begin Header Records ========================================== -->
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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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<!--End Header Records -->
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<!-- Edited by Kersten Feb 02 -->
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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>getnetbyaddr_r()--Get Network Information for IP Address</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 <netdb.h>
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int getnetbyaddr_r(long <em>network_address</em>,
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int <em>address_type</em>,
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struct netent *<em>netent_struct_addr</em>,
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struct netent_data
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*<em>netent_data_struct_addr</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>A program uses the <em>getnetbyaddr_r()</em> function to retrieve
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information about a network. The information is retrieved from the network
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database file.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt>long <strong>network_address</strong> (input) </dt>
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<dd>Specifies the 32-bit network IP address for which information is to be
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retrieved.<br>
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<br>
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</dd>
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<dt>int <strong>address_type</strong> (input) </dt>
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<dd>Specifies an integer that indicates the type of
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<em>network_address</em>.<br>
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<br>
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</dd>
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<dt>struct netent *<strong>netent_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to a netent structure where the results will be
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placed. All results must be referenced through this structure.<br>
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<br>
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</dd>
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<dt>struct netent_data *<strong>netent_data_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to the netent_data structure, which is used to pass
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and preserve results between function calls. The field net_control_blk in the
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netent_data structure must be initialized with hexadecimal zeros before its
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initial use. If compatibility with other platforms is required, then the entire
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netent_data structure must be initialized with hexadecimal zeros before initial
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use.</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>The <em>getnetbyaddr_r()</em> function returns a integer. Possible values
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are:</p>
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<ul>
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<li>-1 (unsuccessful call)</li>
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<li>0 (successful call)</li>
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</ul>
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<p>The <strong>struct netent</strong> denoted by
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<strong><em>netent_struct_addr</em></strong> and <strong>struct
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netent_data</strong>denoted by
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<strong><em>netent_data_struct_addr</em></strong> are both defined in
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<strong><netdb.h></strong>. The structure <strong>struct
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netent</strong>is defined as:</p>
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<pre>
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struct netent [
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char *n_name;
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char **n_aliases;
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int n_addrtype;
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unsigned long n_net;
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];
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</pre>
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<p><em>n_name</em> points to the character string that contains the name of the
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network. <em>n_aliases</em> is a pointer to a NULL-terminated list of pointers,
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each of which points to a character string that represents an alternative name
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for the network. <em>n_addrtype</em> contains the address type of the network
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(that is, AF_INET). <em>n_net</em> is the 32-bit network address (that is, an
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IP address in network byte order with host part set to zero).</p>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>getnetbyaddr_r()</em> function fails, <em>errno</em> can be set
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to:</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>The netent_data structure was not properly
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initialized to hexadecimal zeros before initial use. For corrective action, see
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the description for structure netent_data.</p></dd>
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</dl>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>The iSeries Navigator or the following CL commands can be
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used to access the network database file:<br>
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<br>
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<ul>
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<li>WRKNETTBLE (Work with Network Table Entries)</li>
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<li>ADDNETTBLE (Add Network Table Entry)</li>
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<li>RMVNETTBLE (Remove Network Table Entry)</li>
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</ul>
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<br>
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</li>
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<li>When the network information is obtained from the network database file,
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the file is opened and the network information is retrieved (if it exists) from
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the file. The file is then closed only if a <em>setnetent_r()</em> call with a
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non-zero parameter value was not previously done.<br>
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<br>
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</li>
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<li>A coded character set identifier (CCSID) of 65535 for the job requests that
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no database translation be performed. For translation to occur for the network
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names returned in the netent structure, the job CCSID must be something other
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than 65535.</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="tsgnete.htm">getnetent_r()-</a>-Get Next Entry from Network
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Database<br>
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<br>
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</li>
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<li><a href="tsgnetn.htm">getnetbyname_r()</a>--Get Network Information for Domain
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Name<br>
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<br>
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</li>
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<li><a href="tssnete.htm">setnetent_r()-</a>-Open Network Database<br>
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<br>
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</li>
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<li><a href="tsenete.htm">endnetent_r()</a>--Close Network Database</li>
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</ul>
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<br>
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<hr>
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API introduced: V3R1
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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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