profile/dirserviceprovider/src/nsProfileLock.h
author smontagu@smontagu.org
Tue, 08 Apr 2008 23:36:22 -0700
changeset 14125 fac98ff79f04c09dd7569721a9e603d072ecf6e4
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 35720 4354c4d85277168e35e819f8a956c960672bbf99
permissions -rw-r--r--
Use universal charset detector with filters instead of the old language-specific parallel state machines. Bug 426271, r+sr=dbaron, b=vladimir

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
 * 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>
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#ifndef __nsProfileLock_h___
#define __nsProfileLock_h___

#include "nsILocalFile.h"

class nsIProfileUnlocker;

#if defined (XP_WIN)
#include <windows.h>
#endif

#if defined (XP_OS2)
#define INCL_DOSERRORS
#define INCL_DOSFILEMGR
#include <os2.h>
#endif

#if defined (XP_UNIX)
#include "prclist.h"
#endif

class nsProfileLock
#if defined (XP_UNIX)
  : public PRCList
#endif
{
public:
                            nsProfileLock();
                            nsProfileLock(nsProfileLock& src);

                            ~nsProfileLock();
 
    nsProfileLock&          operator=(nsProfileLock& rhs);
                       
    /**
     * Attempt to lock a profile directory.
     *
     * @param aProfileDir  [in] The profile directory to lock.
     * @param aUnlocker    [out] Optional. This is only returned when locking
     *                     fails with NS_ERROR_FILE_ACCESS_DENIED, and may not
     *                     be returned at all.
     * @throws NS_ERROR_FILE_ACCESS_DENIED if the profile is locked.
     */
    nsresult                Lock(nsILocalFile* aProfileDir, nsIProfileUnlocker* *aUnlocker);
    nsresult                Unlock();
        
private:
    PRPackedBool            mHaveLock;

#if defined (XP_WIN)
    HANDLE                  mLockFileHandle;
#elif defined (XP_OS2)
    LHANDLE                 mLockFileHandle;
#elif defined (XP_UNIX)
    static void             RemovePidLockFiles();
    static void             FatalSignalHandler(int signo);
    static PRCList          mPidLockList;

    nsresult                LockWithFcntl(const nsACString& lockFilePath);

    /**
     * @param aHaveFcntlLock if true, we've already acquired an fcntl lock so this
     * lock is merely an "obsolete" lock to keep out old Firefoxes
     */
    nsresult                LockWithSymlink(const nsACString& lockFilePath, PRBool aHaveFcntlLock);

    char*                   mPidLockFileName;
    int                     mLockFileDesc;
#endif

};

#endif /* __nsProfileLock_h___ */