188 lines
5.4 KiB
HTML
188 lines
5.4 KiB
HTML
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<html>
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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>getprotoent_r()--Get Next Entry from Protocol Database</title>
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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<h2>getprotoent_r()--Get Next Entry from Protocol 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 getprotoent_r(struct protoent
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*<em>protoent_struct_addr</em>,
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struct protoent_data
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*<em>protoent_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>getprotoent_r()</em> function is used to retrieve protocol
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information from the protocol database file. When the <em>getprotoent_r()</em>
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is first called, the file is opened, and the first entry is returned. Each
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subsequent call of <em>getprotoent_r()</em> results in the next entry in the
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file being returned. To close the file, use <em>endprotoent_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 protoent *<strong>protoent_address</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to a protoent 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 protoent_data *<strong>protoent_data_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to the protoent_data structure, which is used to pass
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and preserve results between function calls. The field proto_control_blk in the
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protoent_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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protoent_data structure must be initialized with hexadecimal zeros before
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initial 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>getprotoent_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 protoent</strong> denoted by
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<strong><em>protoent_struct_addr</em></strong> and <strong>struct
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protoent_data</strong> denoted by
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<strong><em>protoent_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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protoent</strong>is defined as:</p>
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<pre>
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struct protoent [
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char *p_name;
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char **p_aliases;
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int p_proto;
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];
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</pre>
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<p><em>p_name</em> points to the character string that contains the name of the
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protocol. <em>p_aliases</em> is a pointer to a NULL-terminated list of
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pointers, each of which points to a character string that represents an
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alternative name for the protocol. <em>p_proto</em> is the protocol number.</p>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>getprotoent_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 protoent_data structure was not properly
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initialized with hexadecimal zeros before initial use. For corrective action,
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see the description for structure protoent_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 protocol database file:<br>
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<br>
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<ul>
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<li>WRKPCLTBLE (Work with Protocol Table Entries)</li>
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<li>ADDPCLTBLE (Add Protocol Table Entry)</li>
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<li>RMVPCLTBLE (Remove Protocol Table Entry)</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 protocol
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names returned in the protoent 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="tsgprotd.htm">getprotobynumber_r()</a>--Get Protocol<br>
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<br>
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</li>
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<li><a href="tsgprotn.htm">getprotobyname_r()</a>--Get Protocol Information for
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Protocol Name<br>
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<br>
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</li>
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<li><a href="tssprote.htm">setprotoent_r()</a>--Open Protocol Database<br>
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<br>
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</li>
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<li><a href="tseprote.htm">endprotoent_r()</a>--Close Protocol 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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