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fixing lfs.lock_dir on windows to return "File exists" instead of looping, plus

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documenting lfs.lock_dir
This commit is contained in:
mascarenhas
2009-04-24 22:24:06 +00:00
parent b80d2baacc
commit c1eff3de6b
2 changed files with 20 additions and 5 deletions
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12
doc/us/manual.html
View File

@@ -172,6 +172,16 @@ LuaFileSystem offers the following functions:
Returns <code>true</code> in case of success or <code>nil</code> plus an
error string.</dd>
<dt><a name="chdir"></a><strong><code>lfs.lock_dir(path, [seconds_stale])</code></strong></dt>
<dd>Creates a lockfile (called lockfile.lfs) in <code>path</code> 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 <code>INT_MAX</code>, which in practice means the lock will never
be stale. To free the the lock call <code>lock:free()</code>. <br/>
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.</dd>
<dt><a name="getcwd"></a><strong><code>lfs.currentdir ()</code></strong></dt>
<dd>Returns a string with the current working directory or <code>nil</code>
plus an error string.</dd>
@@ -251,7 +261,7 @@ LuaFileSystem offers the following functions:
<div id="about">
<p><a href="http://validator.w3.org/check?uri=referer">Valid XHTML 1.0!</a></p>
<p><small>$Id: manual.html,v 1.43 2008/05/08 18:45:15 carregal Exp $</small></p>
<p><small>$Id: manual.html,v 1.44 2009/04/24 22:24:06 mascarenhas Exp $</small></p>
</div> <!-- id="about" -->
</div> <!-- id="container" -->

13
src/lfs.c
View File

@@ -9,6 +9,7 @@
** lfs.currentdir ()
** lfs.dir (path)
** lfs.lock (fh, mode)
** lfs.lock_dir (path)
** lfs.mkdir (path)
** lfs.rmdir (path)
** lfs.setmode (filepath, mode)
@@ -16,7 +17,7 @@
** lfs.touch (filepath [, atime [, mtime]])
** lfs.unlock (fh)
**
** $Id: lfs.c,v 1.58 2009/04/24 22:11:12 mascarenhas Exp $
** $Id: lfs.c,v 1.59 2009/04/24 22:24:07 mascarenhas Exp $
*/
#ifndef _WIN32
@@ -222,11 +223,15 @@ static int lfs_lock_dir(lua_State *L) {
lua_pushnil(L); lua_pushstring(L, strerror(errno)); return 2;
}
strcpy(ln, path); strcat(ln, lockfile);
while((fd = CreateFile(ln, GENERIC_WRITE, 0, NULL, CREATE_NEW,
if((fd = CreateFile(ln, GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, NULL)) == INVALID_HANDLE_VALUE) {
int en = GetLastError();
if(en == ERROR_FILE_EXISTS || en == ERROR_SHARING_VIOLATION) continue;
free(ln); lua_pushnil(L); lua_pushstring(L, strerror(errno)); return 2;
free(ln); lua_pushnil(L);
if(en == ERROR_FILE_EXISTS || en == ERROR_SHARING_VIOLATION)
lua_pushstring(L, "File exists");
else
lua_pushstring(L, strerror(en));
return 2;
}
free(ln);
lock = (lfs_Lock*)lua_newuserdata(L, sizeof(lfs_Lock));