/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qwssignalhandler_p.h"

#ifndef QT_NO_QWS_SIGNALHANDLER

#include <sys/types.h>

#ifndef QT_NO_QWS_MULTIPROCESS

#  include <sys/ipc.h>

#  include <sys/sem.h>

#endif

#include <signal.h>

QT_BEGIN_NAMESPACE

#ifndef Q_OS_BSD4

union semun {

    int val;

    struct semid_ds *buf;

    unsigned short *array;

    struct seminfo  *__buf;

};

#endif

class QWSSignalHandlerPrivate : public QWSSignalHandler

{

public:

    QWSSignalHandlerPrivate() : QWSSignalHandler() {}

};

Q_GLOBAL_STATIC(QWSSignalHandlerPrivate, signalHandlerInstance);

QWSSignalHandler* QWSSignalHandler::instance()

{

    return signalHandlerInstance();

}

QWSSignalHandler::QWSSignalHandler()

{

    const int signums[] = { SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE,

                            SIGSEGV, SIGTERM, SIGBUS };

    const int n = sizeof(signums)/sizeof(int);

    for (int i = 0; i < n; ++i) {

        const int signum = signums[i];

        qt_sighandler_t old = signal(signum, handleSignal);

        if (old == SIG_IGN) // don't remove shm and semaphores when ignored

            signal(signum, old);

        else

            oldHandlers[signum] = (old == SIG_ERR ? SIG_DFL : old);

    }

}

QWSSignalHandler::~QWSSignalHandler()

{

#ifndef QT_NO_QWS_MULTIPROCESS

    while (!semaphores.isEmpty())

        removeSemaphore(semaphores.last());

#endif

}

#ifndef QT_NO_QWS_MULTIPROCESS

void QWSSignalHandler::removeSemaphore(int semno)

{

    const int index = semaphores.lastIndexOf(semno);

    if (index != -1) {

        semun semval;

        semval.val = 0;

        semctl(semaphores.at(index), 0, IPC_RMID, semval);

        semaphores.remove(index);

    }

}

#endif // QT_NO_QWS_MULTIPROCESS

void QWSSignalHandler::handleSignal(int signum)

{

    QWSSignalHandler *h = instance();

    signal(signum, h->oldHandlers[signum]);

#ifndef QT_NO_QWS_MULTIPROCESS

    semun semval;

    semval.val = 0;

    for (int i = 0; i < h->semaphores.size(); ++i)

        semctl(h->semaphores.at(i), 0, IPC_RMID, semval);

#endif

    h->objects.clear();

    raise(signum);

}

QT_END_NAMESPACE

#endif // QT_QWS_NO_SIGNALHANDLER