202 lines
5.8 KiB
HTML
202 lines
5.8 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>gethostent_r()--Get Next Entry from Host Database</title>
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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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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>gethostent_r()--Get Next Entry from Host Database</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 gethostent_r(struct hostent
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*<em>hostent_struct_addr</em>,
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struct hostent_data
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*<em>hostent_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>The <em>gethostent_r()</em> function is used to retrieve information from
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the host database file. When the <em>gethostent_r()</em> is first called, the
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file is opened, and the first entry is returned. Each subsequent call of
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<em>gethostent_r()</em> results in the next entry in the file being returned.
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To close the file, use <em>endhostent_r()</em>.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt>struct hostent *<strong>hostent_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to a hostent 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 hostent_data *<strong>hostent_data_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to the hostent_data structure, which is used to pass
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and preserve results between function calls. The field host_control_blk in the
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hostent_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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hostent_data structure must be initialized to 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>gethostent_r()</em> function returns an 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 hostent</strong> denoted by
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<strong><em>hostent_struct_addr</em></strong> and <strong>struct
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hostent_data</strong>denoted by
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<strong><em>hostent_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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hostent</strong>is defined as:</p>
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<pre>
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struct hostent [
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char *h_name;
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char **h_aliases;
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int h_addrtype;
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int h_length;
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char **h_addr_list;
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];
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#define h_addr h_addr_list[0]
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</pre>
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<p><em>h_name</em> points to the character string that contains the name of the
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host. <em>h_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 host. <em>h_addrtype</em> contains the address type of the host (for
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example, <samp>af_inet</samp>). <em>h_length</em> contains the size of an address
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in octets (for example, the size of an Internet address is 4 octets).
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<em>h_addr_list</em> is a pointer to a NULL-terminated list of pointers, each
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of which points to a network address (in network byte order) for the host.</p>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>gethostent_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 hostent_data structure was not properly initialized to hexadecimal zeros before
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initial use. For corrective action, see the description for structure hostent_data.</p></dd>
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</dl>
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<br>
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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 host database file:<br>
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<br>
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<ul>
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<li>ADDTCPHTE (Add TCP/IP Host Table Entry)</li>
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<li>RMVTCPHTE (Remove TCP/IP Host Table Entry)</li>
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<li>CHGTCPHTE (Change TCP/IP Host Table Entry)</li>
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<li>RNMTCPHTE (Rename TCP/IP Host Table Entry)</li>
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<li>MRGTCPHT (Merge TCP/IP Host Tables)</li>
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</ul>
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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 host
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names returned in the hostent structure, the job CCSID must be something other
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than 65535.</li>
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</ol>
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<h3>Related Information</h3>
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<ul>
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<li><a href="tsghosta.htm">gethostbyaddr_r()</a>--Get Host Information for IP
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Address<br>
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<br>
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</li>
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<li><a href="tsghostb.htm">gethostbyname_r()</a>--Get Host Information for Host
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Name<br>
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<br>
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</li>
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<li><a href="tsehoste.htm">endhostent_r()</a>--Close Host Database<br>
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<br>
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</li>
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<li><a href="tsshoste.htm">sethostent_r()</a>--Open Host 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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