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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __nsProfileLock_h___
#define __nsProfileLock_h___
#include "nsIFile.h"
class nsIProfileUnlocker;
#if defined(XP_WIN)
# include <windows.h>
#endif
#if defined(XP_UNIX)
# include <signal.h>
# 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(nsIFile* aProfileDir, nsIProfileUnlocker** aUnlocker);
/**
* Unlock a profile directory. If you're unlocking the directory because
* the application is in the process of shutting down because of a fatal
* signal, set aFatalSignal to true.
*/
nsresult Unlock(bool aFatalSignal = false);
/**
* Checks, if the given file has a name that matches potential lock file
* names. It does not check, if it actually is the currently active lock.
*/
static bool IsMaybeLockFile(nsIFile* aFile);
/**
* Clean up any left over files in the directory.
*/
nsresult Cleanup();
/**
* Get the modification time of a replaced profile lock, otherwise 0.
*/
nsresult GetReplacedLockTime(PRTime* aResult);
private:
bool mHaveLock;
PRTime mReplacedLockTime;
nsCOMPtr<nsIFile> mLockFile;
#if defined(XP_WIN)
HANDLE mLockFileHandle;
#elif defined(XP_UNIX)
struct RemovePidLockFilesExiting {
RemovePidLockFilesExiting() = default;
~RemovePidLockFilesExiting() { RemovePidLockFiles(false); }
};
static void RemovePidLockFiles(bool aFatalSignal);
static void FatalSignalHandler(int signo
# ifdef SA_SIGINFO
,
siginfo_t* info, void* context
# endif
);
static PRCList mPidLockList;
nsresult LockWithFcntl(nsIFile* aLockFile,
nsIProfileUnlocker** aUnlocker = nullptr);
/**
* @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(nsIFile* aLockFile, bool aHaveFcntlLock);
char* mPidLockFileName;
int mLockFileDesc;
#endif
};
#endif /* __nsProfileLock_h___ */
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