217 lines
6.4 KiB
HTML
217 lines
6.4 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>getservbyport_r()--Get Service Name for Port Number</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>getservbyport_r()--Get Service Name for Port Number</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 getservbyport_r(int <em>port_number</em>,
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char *<em>protocol_name</em>,
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struct servent *<em>servent_struct_addr</em>,
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struct servent_data
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*<em>servent_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>getservbyport_r()</em> function is used to retrieve information
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about a service assigned to a port number. The information is retrieved from
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the service 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>int <strong>port_number</strong> (input) </dt>
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<dd>Specifies the port number for which service 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>char *<strong>protocol_name</strong> (input) </dt>
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<dd>Specifies the pointer to the character string that contains the name of the
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protocol that further qualifies the search criteria. For example, if the
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<em>port_number</em> is 10, and the <em>protocol_name</em> is tcp, then the
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call will return the server that uses the TCP protocol on port number 10. If
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this parameter is set to NULL, then the first server is returned, regardless of
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the protocol used.<br>
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<br>
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</dd>
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<dt>struct servent *<strong>servent_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to a servent 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 servent_data *<strong>servent_data_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to the servent_data structure, which is used to pass
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and preserve results between function calls. The field serve_control_blk in the
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servent_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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servent_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>getservbyport_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 servent</strong> denoted by
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<strong><em>servent_struct_addr</em></strong> and <strong>struct
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servent_data</strong>denoted by
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<strong><em>servent_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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servent</strong>is defined as:</p>
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<pre>
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struct servent [
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char *s_name;
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char **s_aliases;
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int s_port;
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char *s_proto
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];
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</pre>
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<p><em>s_name</em> points to the character string that contains the name of the
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service. <em>s_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 service. <em>s_port</em> is the port number assigned to the service.
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<em>s_proto</em> is a pointer to a character string that contains the name of
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the protocol being used by the service.</p>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>getservbyport_r()</em> function fails, <em>errno</em> can be
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set to:</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>The servent_data structure was not properly initialized with hexadecimal zeros before
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initial use. For corrective action see the description for structure servent_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 services database file:<br>
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<br>
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<ul>
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<li>WRKSRVTBLE (Work with Service Table Entries)</li>
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<li>ADDSRVTBLE (Add Service Table Entry)</li>
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<li>RMVSRVTBLE (Remove Service 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 service information is obtained from the service database file,
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the file is opened and the service information is retrieved (if it exists) from
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the file. The file is then closed only if a <em>setservent_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 protocol
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name specified by the <em>protocol_name</em> parameter, or for the service
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names returned in the servent 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="tsgservn.htm">getservbyname_r()</a>--Get Port Number for Service
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Name<br>
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<br>
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</li>
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<li><a href="tsgserve.htm">getservent_r()</a>--Get Next Entry from Service
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Database<br>
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<br>
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</li>
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<li><a href="tssserve.htm">setservent_r(</a>)--Open Service Database<br>
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<br>
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</li>
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<li><a href="tseserve.htm">endservent_r()</a>--Close Service 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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