/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * 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/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .

 */

#include <sal/config.h>

#include <stdlib.h>

#include <signalshared.hxx>

#include <mutex>

namespace

{

oslSignalHandlerImpl* SignalList;

bool bInitSignal = false;

std::mutex& getSignalMutex()

{

    static std::mutex aMutex;

    return aMutex;

}

}

oslSignalAction callSignalHandler(oslSignalInfo* pInfo)

{

    oslSignalHandlerImpl* pHandler = SignalList;

    oslSignalAction Action = osl_Signal_ActCallNextHdl;

    while (pHandler)

    {

        if ((Action = pHandler->Handler(pHandler->pData, pInfo)) != osl_Signal_ActCallNextHdl)

            break;

        pHandler = pHandler->pNext;

    }

    return Action;

}

oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler, void* pData)

{

    if (!handler)

        return nullptr;

    oslSignalHandlerImpl* pHandler

        = static_cast<oslSignalHandlerImpl*>(calloc(1, sizeof(oslSignalHandlerImpl)));

    std::scoped_lock aGuard(getSignalMutex());

    if (!bInitSignal)

        bInitSignal = onInitSignal();

    if (pHandler)

    {

        pHandler->Handler = handler;

        pHandler->pData = pData;

        pHandler->pNext = SignalList;

        SignalList = pHandler;

        return pHandler;

    }

    return nullptr;

}

sal_Bool SAL_CALL osl_removeSignalHandler(oslSignalHandler handler)

{

    std::scoped_lock aGuard(getSignalMutex());

    if (!bInitSignal)

        bInitSignal = onInitSignal();

    oslSignalHandlerImpl* pHandler = SignalList;

    oslSignalHandlerImpl* pPrevious = nullptr;

    while (pHandler)

    {

        if (pHandler == handler)

        {

            if (pPrevious)

                pPrevious->pNext = pHandler->pNext;

            else

                SignalList = pHandler->pNext;

            if (SignalList == nullptr)

                bInitSignal = onDeInitSignal();

            free(pHandler);

            return true;

        }

        pPrevious = pHandler;

        pHandler = pHandler->pNext;

    }

    return false;

}

oslSignalAction SAL_CALL osl_raiseSignal(sal_Int32 userSignal, void* userData)

{

    std::scoped_lock aGuard(getSignalMutex());

    if (!bInitSignal)

        bInitSignal = onInitSignal();

    oslSignalInfo info;

    info.Signal = osl_Signal_User;

    info.UserSignal = userSignal;

    info.UserData = userData;

    oslSignalAction action = callSignalHandler(&info);

    return action;

}

sal_Bool SAL_CALL osl_setErrorReporting(sal_Bool /*bEnable*/)

{

    // this is part of the stable API

    return false;

}

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