mirror of
https://github.com/MariaDB/server.git
synced 2025-11-09 11:41:36 +03:00
57 lines
3.7 KiB
HTML
57 lines
3.7 KiB
HTML
<!--$Id: notes.so,v 10.17 2000/11/02 16:46:11 bostic Exp $-->
|
|
<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
|
|
<!--All rights reserved.-->
|
|
<html>
|
|
<head>
|
|
<title>Berkeley DB Reference Guide: Windows notes</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><tr valign=top>
|
|
<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Building Berkeley DB for Windows systems</dl></h3></td>
|
|
<td width="1%"><a href="../../ref/build_win/test.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/build_win/faq.html"><img src="../../images/next.gif" alt="Next"></a>
|
|
</td></tr></table>
|
|
<p>
|
|
<h1 align=center>Windows notes</h1>
|
|
<ul type=disc>
|
|
<li>Various Berkeley DB interfaces take a <b>mode</b> argument, intended to specify
|
|
the underlying file permissions for created files. Berkeley DB currently ignores
|
|
this argument on Windows systems.
|
|
<p>It would be possible to construct a set of security attributes to pass to
|
|
<b>CreateFile</b> that accurately represents the mode. In the worst
|
|
case, this would involve looking up user and all group names and creating
|
|
an entry for each. Alternatively, we could call the <b>_chmod</b>
|
|
(partial emulation) function after file creation, although this leaves us
|
|
with an obvious race.
|
|
<p>Practically speaking, however, these efforts would be largely meaningless
|
|
on FAT, the most common file system, which only has a "readable" and
|
|
"writeable" flag, applying to all users.
|
|
<li>When using the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a> flag, Berkeley DB shared regions are
|
|
created without ACLs, which means that the regions are only accessible
|
|
to a single user. If wider sharing is appropriate (e.g., both user
|
|
applications and Windows/NT service applications need to access the
|
|
Berkeley DB regions), the Berkeley DB code will need to be modified to create the
|
|
shared regions with the correct ACLs. Alternatively, by not specifying
|
|
the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a> flag, file-system backed regions will be
|
|
created instead, and the permissions on those files may be directly
|
|
specified through the <a href="../../api_c/env_open.html">DBENV->open</a> interface.
|
|
<li>On Windows/9X, files opened by multiple processes do not share data
|
|
correctly. For this reason, the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a> flag is implied
|
|
for any application that does not specify the <a href="../../api_c/env_open.html#DB_PRIVATE">DB_PRIVATE</a> flag,
|
|
causing the system paging file to be used for sharing data. However,
|
|
paging file memory is freed on last close, implying that multiple
|
|
processes sharing an environment must arrange for at least one process
|
|
to always have the environment open, or, alternatively, that any process
|
|
joining the environment be prepared to re-create it. If a shared
|
|
environment is closed by all processes, a subsequent open without
|
|
specifying the <a href="../../api_c/env_open.html#DB_CREATE">DB_CREATE</a> flag will result in the return of a
|
|
system EAGAIN error code.
|
|
</ul>
|
|
<table><tr><td><br></td><td width="1%"><a href="../../ref/build_win/test.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/build_win/faq.html"><img src="../../images/next.gif" alt="Next"></a>
|
|
</td></tr></table>
|
|
<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
|
|
</body>
|
|
</html>
|