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4.1 KiB
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<!--$Id: set_func_seek.so,v 10.7 2000/05/31 15:10:01 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_seek</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_seek</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_seek(int (*func_seek)(int fd, size_t pgsize,
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db_pgno_t pageno, u_int32_t relative, int rewind, int whence));
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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 specify that a subsequent read
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from or write to a file will occur at a specific location in that file.
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The <b>func_seek</b> argument must conform to the following interface:
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<p><blockquote><pre>int seek(int fd, size_t pgsize, db_pgno_t pageno,
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u_int32_t relative, int rewind, int whence);</pre></blockquote>
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<p>The <b>fd</b> argument is an open file descriptor on the file.
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<p>The <b>seek</b> function must cause a subsequent read from or write to
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the file to occur at a byte offset specified by the calculation:
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<p><blockquote><pre>(pgsize * pageno) + relative</pre></blockquote>
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<p>If <b>rewind</b> is non-zero, the byte offset is treated as a backwards
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seek, not a forwards one.
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<p>The <b>whence</b> argument specifies where in the file the byte offset
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is relative to, as described by the IEEE/ANSI Std 1003.1 (POSIX) <b>lseek</b> system
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call.
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<p>The <b>func_seek</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_seek 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_seek 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_seek 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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