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lock, err = lfs.lock_dir(path, [seconds_stale]) Creates a lockfile (called lockfile.lfs) in <path> if it does not exist and returns the lock. If the lock already exists checks it it's stale, using the second parameter (default for the second parameter is INT_MAX, which in practice means the lock will never be stale. To free the the lock call lock:free(). In case of any errors it returns nil and the error message. In particular, if the lock exists and is not stale it returns the "File exists" message.
LuaFileSystem - File System Library for Lua
Copyright 2003 Kepler Project
http://www.keplerproject.org/luafilesystem
Description
-----------
LuaFileSystem is a Lua library developed to complement the set of functions
related to file systems offered by the standard Lua distribution.
LuaFileSystem offers a portable way to access the underlying directory structure and file attributes.
LuaFileSystem is free software and uses the same license as Lua 5.1
LuaRocks Installation
---------------------
luarocks install luafilesystem
Unix Installation
-----------------
To install on Linux/OSX/BSD, please edit the config file and then call
make
make install
The last step may require root privileges.
Windows Installation
--------------------
To install on Windows, please copy lfs.dll to your package.cpath directory
Documentation
-------------
Please check the documentation at /doc/us/ for more information.
History
-------
Version 1.4.2 [03/Feb/2009]
* fixed bug [#13198] lfs.attributes(filename, 'size') overflow on files > 2 Gb again (bug report and patch by KUBO Takehiro).
* fixed bug [#39794] Compile error on Solaris 10 (bug report and patch by Aaron B).
* fixed compilation problems with Borland C.
Version 1.4.1 [07/May/2008]
* documentation review
* fixed Windows compilation issues
* fixed bug in the Windows tests (patch by Shmuel Zeigerman)
* fixed bug [#2185] lfs.attributes(filename, 'size') overflow on files > 2 Gb
Version 1.4.0 [13/Feb/2008]
* added function lfs.setmode (works only in Windows systems).
* lfs.attributes raises an error if attribute does not exist
Version 1.3.0 [26/Oct/2007]
* added function lfs.symlinkattributes (works only in non Windows systems).
Version 1.2.1 [08/May/2007]
* compatible only with Lua 5.1 (Lua 5.0 support was dropped)
Version 1.2 [15/Mar/2006]
* added optional argument to lfs.attributes
* added function lfs.rmdir
* bug correction on lfs.dir
Version 1.1 [30/May/2005]
* added function lfs.touch.
Version 1.0 [21/Jan/2005]
Version 1.0 Beta [10/Nov/2004]