<!--$Id: memp_set_clear_len.so,v 10.14 2003/11/08 19:17:40 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_MPOOLFILE->set_clear_len</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_MPOOLFILE->set_clear_len</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_c/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.h> <p> int DB_MPOOLFILE->set_clear_len(DB_MPOOLFILE *mpf, u_int32_t len); <p> int DB_MPOOLFILE->get_clear_len(DB_MPOOLFILE *mpf, u_int32_t *lenp); </pre></h3> <hr size=1 noshade> <h3>Description: DB_MPOOLFILE->set_clear_len</h3> <a name="3"><!--meow--></a> <p>The DB_MPOOLFILE->set_clear_len method sets the number of initial bytes in a page that should be set to nul when the page is created as a result of the <a href="../../db42-devel-4.2.52/api_c/memp_fget.html#DB_MPOOL_CREATE">DB_MPOOL_CREATE</a> or <a href="../../db42-devel-4.2.52/api_c/memp_fget.html#DB_MPOOL_NEW">DB_MPOOL_NEW</a> flags being specified to <a href="../../db42-devel-4.2.52/api_c/memp_fget.html">DB_MPOOLFILE->get</a>. If no value is specified, or <b>len</b> is 0, the entire page is cleared.</p> <p>The DB_MPOOLFILE->set_clear_len method configures a file in the memory pool, not only operations performed using the specified <a href="../../db42-devel-4.2.52/api_c/mempfile_class.html">DB_MPOOLFILE</a> handle.</p> <p>The DB_MPOOLFILE->set_clear_len method may not be called after the <a href="../../db42-devel-4.2.52/api_c/memp_fopen.html">DB_MPOOLFILE->open</a> method is called. If the file is already open in the memory pool when <a href="../../db42-devel-4.2.52/api_c/memp_fopen.html">DB_MPOOLFILE->open</a> is called, the information specified to DB_MPOOLFILE->set_clear_len must be consistent with the existing file or an error will be returned. </p> <p>The DB_MPOOLFILE->set_clear_len method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>len</b><dd> The <b>len</b> parameter is the number of initial bytes in a page that should be set to nul when the page is created. A value of 0 results in the entire page being set to nul bytes. </dl> <hr size=1 noshade> <h3>Description: DB_MPOOLFILE->get_clear_len</h3> <p>The DB_MPOOLFILE->get_clear_len method returns the bytes to be cleared.</p> <p>The DB_MPOOLFILE->get_clear_len method may be called at any time during the life of the application.</p> <p>The DB_MPOOLFILE->get_clear_len method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>lenp</b><dd> The DB_MPOOLFILE->get_clear_len method returns the bytes to be cleared in <b>lenp</b>. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_c/env_class.html">DB_ENV</a>, <a href="../../db42-devel-4.2.52/api_c/mempfile_class.html">DB_MPOOLFILE</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_c/memp_list.html">Memory Pools and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_c/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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