68 lines
3.1 KiB
HTML
68 lines
3.1 KiB
HTML
<!--$Id: set_func_ioinfo.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: db_env_set_func_ioinfo</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++">
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</head>
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<body bgcolor=white>
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<table width="100%"><tr valign=top>
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<td>
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<b>db_env_set_func_ioinfo</b>
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</td>
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<td align=right>
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<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db.h>
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<p>
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int
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db_env_set_func_ioinfo(int (*func_ioinfo)(const char *path,
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int fd, u_int32_t *mbytesp, u_int32_t *bytesp, u_int32_t *iosizep));
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</pre></b>
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<hr size=1 noshade>
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<b>Description: db_env_set_func_ioinfo</b>
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<p>The Berkeley DB library requires the ability to determine the size and I/O
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characteristics of a file.</p>
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<p>The db_env_set_func_ioinfo method configures all operations performed by a process and
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all of its threads of control, not operations confined to a single
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database environment.</p>
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<p>Although the db_env_set_func_ioinfo method may be called at any time during the life of
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the application, it should normally be called before making calls to the
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<a href="../api_c/env_class.html">db_env_create</a> or <a href="../api_c/db_class.html">db_create</a> methods.</p>
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<p>The db_env_set_func_ioinfo method
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returns a non-zero error value on failure
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and 0 on success.
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</p>
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<b>Parameters</b> <br>
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<b>func_ioinfo</b><ul compact><li>The <b>func_ioinfo</b> parameter is the function which returns the size
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and I/O characteristics of a file.
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<p>The <b>path</b> parameter is the pathname of the file to be checked, and the
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<b>fd</b> parameter is an open file descriptor on the file.</p>
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<p>If the <b>mbytesp</b> and <b>bytesp</b> parameters are non-NULL, the
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<b>ioinfo</b> function must return in them the size of the file: the
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number of megabytes in the file into the memory location to which the
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<b>mbytesp</b> parameter refers, and the number of bytes over and above
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that number of megabytes into the memory location to which the
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<b>bytesp</b> parameter refers.</p>
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<p>In addition, if the <b>iosizep</b> parameter is non-NULL, the <b>ioinfo</b>
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function must return the optimum granularity for I/O operations to the file
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into the memory location to which it refers.</p>
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<p>The <b>func_ioinfo</b> function must return the value of <b>errno</b> on
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failure and 0 on success.</p></ul>
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<br>
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<br><b>See Also</b>
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<a href="../ref/program/runtime.html">Run-time configuration</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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