233 lines
6.1 KiB
HTML
233 lines
6.1 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>getprotobyname()--Get Protocol Information for Protocol Name</title>
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<a name="Top_Of_Page"></a>
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<h2>getprotobyname()--Get Protocol Information for Protocol Name</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 protoent *getprotobyname(char *<em>protocol_name</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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<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 protoent *getprotobyname(const char *<em>protocol_name</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
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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>getprotobyname()</em> function is used to retrieve information about
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a protocol. The information is retrieved from the protocol 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>protocol_name</strong></dt>
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<dd>(Input) The pointer to the character string that contains the name of the
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protocol for which information is to be retrieved.</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>getprotobyname()</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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protoent</strong></li>
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</ul>
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<p>The structure <strong>struct protoent</strong> is defined in
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<strong><netdb.h></strong>.</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 array of
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alternate names for the protocol. <em>p_proto</em> is the protocol number.</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 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)<br>
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<br>
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</li>
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<li>ADDPCLTBLE (Add Protocol Table Entry)<br>
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<br>
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</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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<br>
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</li>
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<li>The pointer returned by <em>getprotobyname()</em> points to static storage
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that is overwritten on subsequent calls to the <em>getprotobyname()</em>,
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<em>getprotobynumber()</em>, or <em>getprotoent()</em> functions.<br>
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<br>
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</li>
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<li>When the protocol information is obtained from the protocol database file,
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the file is opened and the protocol information is retrieved (if it exists)
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from the file. The file is then closed only if a <em>setprotoent()</em> with a
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nonzero 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, and 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.<br>
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<br>
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</li>
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<li>Do not use the <em>getprotobyname()</em> function in a multithreaded
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environment. See the multithread alternative <em>getprotobyname_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>getprotobyname()</em> API is mapped to
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<em>qso_getprotobyname98()</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
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UNIX 98 compatible interface<br>
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<br>
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</li>
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<li><a href="gprotnu.htm">getprotobynumber()</a>--Get Protocol Information for
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Protocol Number<br>
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<br>
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</li>
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<li><a href="gprotnt.htm">getprotoent()</a>--Get Next Entry from Protocol
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Database<br>
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<br>
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</li>
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<li><a href="sprotnt.htm">setprotoent()</a>--Open Protocol Database<br>
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<br>
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</li>
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<li><a href="eprotnt.htm">endprotoent()</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: V4R2
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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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