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<div id="preamble"><h1>Apache Module mod_dav_lock</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_dav_lock.html" title="English"> en </a> |
<a href="../fr/mod/mod_dav_lock.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Generic locking module for <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code></td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>dav_lock_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_dav_lock.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.1 and later</td></tr></table>
<h3>Summary</h3>
<p>This module implements a generic locking API which can be used by any
backend provider of <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code>. It <em>requires</em> at least
the service of <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code>. But without a backend provider
which makes use of it, it's useless and should not be loaded into the
server. A sample backend module which actually utilizes
<code class="module"><a href="../mod/mod_dav_lock.html">mod_dav_lock</a></code> is <a href="http://subversion.apache.org/">mod_dav_svn</a>, the subversion provider module.</p>
<p>Note that <code class="module"><a href="../mod/mod_dav_fs.html">mod_dav_fs</a></code> does <em>not</em> need this
generic locking module, because it uses its own more specialized
version.</p>
<p>In order to make <code class="module"><a href="../mod/mod_dav_lock.html">mod_dav_lock</a></code> functional, you just have
to specify the location of the lock database using the <code class="directive"><a href="#davgenericlockdb">DavGenericLockDB</a></code> directive described
below.</p>
<div class="note"><h3>Developer's Note</h3>
<p>In order to retrieve the pointer to the locking provider function, you
have to use the <code>ap_lookup_provider</code> API with the arguments
<code>dav-lock</code>, <code>generic</code>, and <code>0</code>.</p>
</div>
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<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#davgenericlockdb">DavGenericLockDB</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_dav_lock">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_dav_lock">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code></li>
<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="directive-section"><h2><a name="DavGenericLockDB" id="DavGenericLockDB">DavGenericLockDB</a> <a name="davgenericlockdb" id="davgenericlockdb">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the DAV lock database</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DavGenericLockDB <var>file-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_dav_lock</td></tr>
</table>
<p>Use the <code class="directive">DavGenericLockDB</code> directive to specify
the full path to the lock database, excluding an extension. If
the path is not absolute, it will be interpreted relative to <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>. The implementation of
<code class="module"><a href="../mod/mod_dav_lock.html">mod_dav_lock</a></code> uses a SDBM database to track user
locks.</p>
<div class="example"><h3>Example</h3><pre class="prettyprint lang-config">DavGenericLockDB var/DavLock</pre>
</div>
<p>The directory containing the lock database file must be
writable by the <code class="directive"><a href="../mod/mod_unixd.html#user">User</a></code>
and <code class="directive"><a href="../mod/mod_unixd.html#group">Group</a></code> under which
Apache is running. For security reasons, you should create a
directory for this purpose rather than changing the permissions on
an existing directory. In the above example, Apache will create
files in the <code>var/</code> directory under the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> with the base filename
<code>DavLock</code> and an extension added by the server.</p>
</div>
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