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nsProfileLock.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2002
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Conrad Carlen <ccarlen@netscape.com>
00024  *   Brendan Eich <brendan@mozilla.org>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
00028  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
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00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #ifndef __nsProfileLock_h___
00041 #define __nsProfileLock_h___
00042 
00043 #include "nsILocalFile.h"
00044 
00045 class nsIProfileUnlocker;
00046 
00047 #if defined (XP_WIN)
00048 #include <windows.h>
00049 #endif
00050 
00051 #if defined (XP_OS2)
00052 #define INCL_DOSERRORS
00053 #define INCL_DOSFILEMGR
00054 #include <os2.h>
00055 #endif
00056 
00057 #if defined (XP_UNIX)
00058 #include "prclist.h"
00059 #endif
00060 
00061 class nsProfileLock
00062 #if defined (XP_UNIX)
00063   : public PRCList
00064 #endif
00065 {
00066 public:
00067                             nsProfileLock();
00068                             nsProfileLock(nsProfileLock& src);
00069 
00070                             ~nsProfileLock();
00071  
00072     nsProfileLock&          operator=(nsProfileLock& rhs);
00073                        
00083     nsresult                Lock(nsILocalFile* aProfileDir, nsIProfileUnlocker* *aUnlocker);
00084     nsresult                Unlock();
00085         
00086 private:
00087     PRPackedBool            mHaveLock;
00088 
00089 #if defined (XP_WIN)
00090     HANDLE                  mLockFileHandle;
00091 #elif defined (XP_OS2)
00092     LHANDLE                 mLockFileHandle;
00093 #elif defined (XP_UNIX)
00094     static void             RemovePidLockFiles();
00095     static void             FatalSignalHandler(int signo);
00096     static PRCList          mPidLockList;
00097 
00098     nsresult                LockWithFcntl(const nsACString& lockFilePath);
00099 
00104     nsresult                LockWithSymlink(const nsACString& lockFilePath, PRBool aHaveFcntlLock);
00105 
00106     char*                   mPidLockFileName;
00107     int                     mLockFileDesc;
00108 #endif
00109 
00110 };
00111 
00112 #endif /* __nsProfileLock_h___ */