238 lines
6.2 KiB
HTML
238 lines
6.2 KiB
HTML
<!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()--Get Network Information for IP Address</title>
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<body>
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<a name="Top_Of_Page"></a>
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<h2>getnetbyaddr()--Get Network Information for IP Address</h2>
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<div class="box" style="width: 80%;">
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<br>
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BSD 4.3 Syntax<br>
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<pre>
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#include <netdb.h>
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struct netent *getnetbyaddr(long <em>network_address</em>,
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int <em>address_type</em>)
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</pre>
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<br>
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Service Program Name: QSOSRV2<br>
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<br>
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Default Public Authority: *USE<br>
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<br>
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Threadsafe: No; see <a href="#USAGE_NOTES">Usage Notes</a>.<br>
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<br>
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</div>
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<br>
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<div class="box" style="width: 80%;">
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<br>
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<a href="_xopen_source.htm">UNIX 98 Compatible Syntax</a><br>
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<pre>
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#define _XOPEN_SOURCE 520
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#include <netdb.h>
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struct netent *getnetbyaddr(uint32_t <em>network_address</em>,
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int <em>address_type</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: No; see <a href="#USAGE_NOTES">Usage Notes</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <em>getnetbyaddr()</em> function is used to retrieve information about a
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network. The information is retrieved from the network database file.</p>
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<p>There are two versions of the API, as shown above. The base i5/OS API uses BSD 4.3
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structures and syntax. The other uses syntax and structures compatible with the UNIX 98
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programming interface specifications. You can select the UNIX 98 compatible
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interface with the <a href="_xopen_source.htm">_XOPEN_SOURCE</a> macro.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>network_address</strong></dt>
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<dd>(Input) 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><strong>address_type</strong></dt>
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<dd>(Input) An integer that indicates the type of
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<em>network_address</em>.</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>getnetbyaddr()</em> returns a pointer. Possible values are: </p>
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<ul>
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<li>NULL (unsuccessful)<br>
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<br>
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</li>
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<li>p (successful), where p is a pointer to <strong>struct
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netent</strong>.</li>
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</ul>
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<p>The structure <strong>struct netent</strong> is defined in
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<strong><netdb.h></strong>.</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 array of
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alternate names for the network. <em>n_addrtype</em> contains the address type
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of the network. <em>n_net</em> is the 32-bit network address (an IP address
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with host part set to zero).</p>
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<br>
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<h3><a name="USAGE_NOTES">Usage Notes</a></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><br>
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<ul>
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<li>WRKNETTBLE (Work with Network Table Entries)<br>
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<br>
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</li>
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<li>ADDNETTBLE (Add Network Table Entry)<br>
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<br>
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</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>The pointer returned by <em>getnetbyaddr()</em> points to static storage
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that is overwritten on subsequent calls to the <em>getnetbyaddr()</em>,
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<em>getnetbyname()</em>, or <em>getnetent()</em> functions.<br>
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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()</em> with a nonzero
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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.<br>
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<br>
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</li>
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<li>Do not use the <em>getnetbyaddr()</em> function in a multithreaded
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environment. See the multithread alternative <em>getnetbyaddr_r()</em>
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function.<br>
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<br>
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</li>
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<li>When you develop in C-based languages and an application is compiled with the _XOPEN_SOURCE
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macro defined to the value 520 or greater, the <em>getnetbyaddr()</em> API is mapped to
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<em>qso_getnetbyaddr98()</em>.</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="_xopen_source.htm">_XOPEN_SOURCE</a>--Using _XOPEN_SOURCE for the UNIX 98
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compatible interface<br>
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<br>
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</li>
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<li><a href="gnetnm.htm">getnetbyname()</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="gnetnt.htm">getnetent()</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="snetnt.htm">setnetent()</a>--Open Network Database<br>
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<br>
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</li>
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<li><a href="enetnt.htm">endnetent()</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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