# Apache模块 mod_dav_lock | [说明](#calibre_link-11) | 为`mod_dav`锁定服务器上的文件提供支持 | | --- | --- | | [状态](#calibre_link-12) | 扩展(E) | | [模块名](#calibre_link-13) | dav_lock_module | | [源文件](#calibre_link-14) | mod_dav_lock.c | | [兼容性](#calibre_link-58) | 仅在 Apache 2.1 及以后的版本中可用 | ### 概述 This module implements a generic locking API which can be used by any backend provider of `mod_dav`. It _requires_ at least the service of `mod_dav`. 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 `mod_dav_lock`, is [mod_dav_svn](http://subversion.tigris.org/), the subversion provider module. Note that `mod_dav_fs` does _not_ need this generic locking module, because it uses it's own more specialized version. In order to make `mod_dav_lock` functional, you just have to specify the location of the lock database using the `DavGenericLockDB` directive described below. ### Developer's Note In order to retrieve the pointer to the locking provider function, you have to use the `ap_lookup_provider` API with the arguments `dav-lock`, `generic`和`0`. ## DavGenericLockDB 指令 | [说明](#calibre_link-18) | Location of the DAV lock database | | --- | --- | | [语法](#calibre_link-19) | `DavGenericLockDB file-path` | | [作用域](#calibre_link-20) | server config, virtual host, directory | | [状态](#calibre_link-21) | 扩展(E) | | [模块](#calibre_link-22) | mod_dav_lock | Use the `DavGenericLockDB` directive to specify the full path to the lock database, excluding an extension. If the path is not absolute, it will be taken relative to `ServerRoot`. The implementation of `mod_dav_lock` uses a SDBM database to track user locks. ### 示例 ``` DavGenericLockDB var/DavLock ``` The directory containing the lock database file must be writable by the `User`和`Group` 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 `var/` directory under the `ServerRoot` with the base filename `DavLock` and extension name chosen by the server.