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4.2 KiB
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<!--$Id: set_func_ioinfo.so,v 10.6 2000/05/31 15:10:00 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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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,b+tree,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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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>db_env_set_func_ioinfo</h1>
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</td>
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<td width="1%">
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<a href="../api_c/c_index.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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<hr size=1 noshade>
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<tt>
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<h3><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></h3>
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<h1>Description</h1>
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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. The <b>func_ioinfo</b> argument must conform
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to the following interface:
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<p><blockquote><pre>int ioinfo(const char *path, int fd,
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u_int32_t *mbytesp, u_int32_t *bytesp, u_int32_t *iosizep);</pre></blockquote>
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<p>The <b>path</b> argument is the pathname of the file to be checked, and the
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<b>fd</b> argument is an open file descriptor on the file.
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<p>If the <b>mbytesp</b> and <b>bytesp</b> arguments 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 referenced by
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the <b>mbytesp</b> argument, and the number of bytes over and above that
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number of megabytes into the memory location referenced by the
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<b>bytesp</b> argument.
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<p>In addition, if the <b>iosizep</b> argument 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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in the memory location referenced by it.
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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.
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<p>The db_env_set_func_ioinfo interface affects the entire application, not a single
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database or database environment.
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<p>While the db_env_set_func_ioinfo interface may be used to configure Berkeley DB at any time
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during the life of the application, it should normally be called before
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making any calls to the <a href="../api_c/env_create.html">db_env_create</a> or <a href="../api_c/db_create.html">db_create</a> functions.
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<p>The db_env_set_func_ioinfo function returns a non-zero error value on failure and 0 on success.
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<h1>Errors</h1>
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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</dl>
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<h1>See Also</h1>
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<a href="../api_c/set_func_close.html">db_env_set_func_close</a>,
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<a href="../api_c/set_func_dirfree.html">db_env_set_func_dirfree</a>,
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<a href="../api_c/set_func_dirlist.html">db_env_set_func_dirlist</a>,
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<a href="../api_c/set_func_exists.html">db_env_set_func_exists</a>,
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<a href="../api_c/set_func_free.html">db_env_set_func_free</a>,
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<a href="../api_c/set_func_fsync.html">db_env_set_func_fsync</a>,
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<a href="../api_c/set_func_ioinfo.html">db_env_set_func_ioinfo</a>,
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<a href="../api_c/set_func_malloc.html">db_env_set_func_malloc</a>,
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<a href="../api_c/set_func_map.html">db_env_set_func_map</a>,
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<a href="../api_c/set_func_open.html">db_env_set_func_open</a>,
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<a href="../api_c/set_func_read.html">db_env_set_func_read</a>,
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<a href="../api_c/set_func_realloc.html">db_env_set_func_realloc</a>,
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<a href="../api_c/set_func_seek.html">db_env_set_func_seek</a>,
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<a href="../api_c/set_func_sleep.html">db_env_set_func_sleep</a>,
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<a href="../api_c/set_func_unlink.html">db_env_set_func_unlink</a>,
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<a href="../api_c/set_func_unmap.html">db_env_set_func_unmap</a>,
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<a href="../api_c/set_func_write.html">db_env_set_func_write</a>
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and
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<a href="../api_c/set_func_yield.html">db_env_set_func_yield</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_c/c_index.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><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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