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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_IMPORTER_FIREFOX_PROFILE_LOCK_H__
#define CHROME_BROWSER_IMPORTER_FIREFOX_PROFILE_LOCK_H__
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#endif
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/gtest_prod_util.h"
// Firefox is designed to allow only one application to access its
// profile at the same time.
// Reference:
// http://kb.mozillazine.org/Profile_in_use
//
// This class is based on Firefox code in:
// profile/dirserviceprovider/src/nsProfileLock.cpp
// The license block is:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Conrad Carlen <ccarlen@netscape.com>
* Brendan Eich <brendan@mozilla.org>
* Colin Blake <colin@theblakes.com>
* Javier Pedemonte <pedemont@us.ibm.com>
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
class FirefoxProfileLock {
public:
explicit FirefoxProfileLock(const FilePath& path);
~FirefoxProfileLock();
// Locks and releases the profile.
void Lock();
void Unlock();
// Returns true if we lock the profile successfully.
bool HasAcquired();
private:
FRIEND_TEST_ALL_PREFIXES(FirefoxProfileLockTest, ProfileLock);
FRIEND_TEST_ALL_PREFIXES(FirefoxProfileLockTest, ProfileLockOrphaned);
static const FilePath::CharType* kLockFileName;
static const FilePath::CharType* kOldLockFileName;
void Init();
// Full path of the lock file in the profile folder.
FilePath lock_file_;
// The handle of the lock file.
#if defined(OS_WIN)
HANDLE lock_handle_;
#elif defined(OS_POSIX)
int lock_fd_;
// On Posix systems Firefox apparently first tries to put a fcntl lock
// on a file and if that fails, it does a regular exculsive open on another
// file. This variable contains the location of this other file.
FilePath old_lock_file_;
// Method that tries to put a fcntl lock on file specified by |lock_file_|.
// Returns false if lock is already held by another process. true in all
// other cases.
bool LockWithFcntl();
#endif
DISALLOW_COPY_AND_ASSIGN(FirefoxProfileLock);
};
#endif // CHROME_BROWSER_IMPORTER_FIREFOX_PROFILE_LOCK_H__
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