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146 lines
6.6 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>db_env_set_func_ioinfo</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="setfunc.html" title="Appendix C. Berkeley DB Application Space Static Functions" />
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<link rel="prev" href="db_env_set_func_ftruncate.html" title="db_env_set_func_ftruncate" />
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<link rel="next" href="db_env_set_func_malloc.html" title="db_env_set_func_malloc" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">db_env_set_func_ioinfo</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="db_env_set_func_ftruncate.html">Prev</a> </td>
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<th width="60%" align="center">Appendix C.
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Berkeley DB Application Space Static Functions
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="db_env_set_func_malloc.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="db_env_set_func_ioinfo"></a>db_env_set_func_ioinfo</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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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)); </pre>
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<p>
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The Berkeley DB library requires the ability to determine the size and
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I/O characteristics of a file.
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</p>
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<p>
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The <code class="function">db_env_set_func_ioinfo()</code> function configures all operations performed
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by a process and all of its threads of control, not operations
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confined to a single database environment.
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</p>
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<p>
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Although the <code class="function">db_env_set_func_ioinfo()</code> function may be called at any time
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during the life of the application, it should normally be called
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before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or
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<a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods.
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</p>
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<p>
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The <code class="function">db_env_set_func_ioinfo()</code> <span>
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function returns a non-zero error value on failure and 0 on success.
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3953982"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3953985"></a>func_ioinfo</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>func_ioinfo</strong></span> parameter is the
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function which returns the size and I/O characteristics of a file.
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</p>
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<p>
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The <span class="bold"><strong>path</strong></span> parameter is the pathname of
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the file to be checked, and the <span class="bold"><strong>fd</strong></span>
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parameter is an open file descriptor on the file.
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</p>
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<p>
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If the <span class="bold"><strong>mbytesp</strong></span> and <span class="bold"><strong>bytesp</strong></span> parameters are non-NULL, the <span class="bold"><strong>ioinfo</strong></span> function must return in them the size of
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the file: the number of megabytes in the file into the memory location
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to which the <span class="bold"><strong>mbytesp</strong></span> parameter
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refers, and the number of bytes over and above that number of
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megabytes into the memory location to which the <span class="bold"><strong>bytesp</strong></span> parameter refers.
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</p>
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<p>
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In addition, if the <span class="bold"><strong>iosizep</strong></span> parameter
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is non-NULL, the <span class="bold"><strong>ioinfo</strong></span> function must
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return the optimum granularity for I/O operations to the file into the
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memory location to which it refers.
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</p>
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<p>
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The <span class="bold"><strong>func_ioinfo</strong></span> function must return
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the value of <span class="bold"><strong>errno</strong></span> on failure and 0
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on success.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3953895"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a href="../../programmer_reference/program_runtime.html" class="olink">Run-time configuration</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="db_env_set_func_ftruncate.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="setfunc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="db_env_set_func_malloc.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">db_env_set_func_ftruncate </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> db_env_set_func_malloc</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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