<!--$Id: db_fd.so,v 10.30 2003/10/31 15:17:43 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: Db::fd</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>Db::fd</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int Db::fd(int *fdp); </pre></h3> <hr size=1 noshade> <h3>Description: Db::fd</h3> <p>The Db::fd method provides access to a file descriptor representative of the underlying database. A file descriptor referring to the same file will be returned to all processes that call <a href="../../db42-devel-4.2.52/api_cxx/db_open.html">Db::open</a> with the same <b>file</b> parameter.</p> <p>This file descriptor may be safely used as a parameter to the <b>fcntl</b>(2) and <b>flock</b>(2) locking functions. The file descriptor is not necessarily associated with any of the underlying files actually used by the access method.</p> <p>The Db::fd method only supports a coarse-grained form of locking. Applications should instead use the Berkeley DB lock manager where possible.</p> <p>The Db::fd method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>fdp</b><dd> The <b>fdp</b> parameter references memory into which the current file descriptor is copied. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/db_class.html">Db</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/db_list.html">Databases and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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