/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "ProcessLauncher.h"

#include "Connection.h"
#include "RunLoop.h"
#include "WebProcess.h"
#include <QApplication>
#include <QDebug>
#include <QFile>
#include <QLocalServer>
#include <QMetaType>
#include <QProcess>
#include <QString>
#include <QtCore/qglobal.h>
#include <WebCore/NotImplemented.h>
#include <errno.h>
#include <fcntl.h>
#include <runtime/InitializeThreading.h>
#include <string>
#include <sys/resource.h>
#include <sys/socket.h>
#include <unistd.h>
#include <wtf/HashSet.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Threading.h>
#include <wtf/text/WTFString.h>
#if defined Q_OS_LINUX
#include <sys/prctl.h>
#include <signal.h>
#endif

using namespace WebCore;

namespace WebKit {

class QtWebProcess : public QProcess
{
    Q_OBJECT
public:
    QtWebProcess(QObject* parent = 0)
        : QProcess(parent)
    {
    }

protected:
    virtual void setupChildProcess();
};

void QtWebProcess::setupChildProcess()
{
#if defined Q_OS_LINUX
#ifndef NDEBUG
    if (getenv("QT_WEBKIT_KEEP_ALIVE_WEB_PROCESS"))
        return;
#endif
    prctl(PR_SET_PDEATHSIG, SIGKILL);
#endif
}

#if OS(SYMBIAN)
// FIXME: Symbian's POSIX layer doesn't have a socketpair(), so
// the following is just to fix the build until a pure Symbian
// IPC implementation lands on trunk
static int socketpair(int, int, int , int[2])
{
    return -1;
}
#endif

void ProcessLauncher::launchProcess()
{
    QString applicationPath = QLatin1String("%1 %2");

    if (QFile::exists(QCoreApplication::applicationDirPath() + QLatin1String("/QtWebProcess"))) {
        applicationPath = applicationPath.arg(QCoreApplication::applicationDirPath() + QLatin1String("/QtWebProcess"));
    } else {
        applicationPath = applicationPath.arg(QLatin1String("QtWebProcess"));
    }

    int sockets[2];
    if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sockets) == -1) {
        qDebug() << "Creation of socket failed with errno:" << errno;
        ASSERT_NOT_REACHED();
        return;
    }

    // Don't expose the ui socket to the web process
    while (fcntl(sockets[1], F_SETFD, FD_CLOEXEC)  == -1) {
        if (errno != EINTR) {
            ASSERT_NOT_REACHED();
            while (close(sockets[0]) == -1 && errno == EINTR) { }
            while (close(sockets[1]) == -1 && errno == EINTR) { }
            return;
        }
    }

    QString program(applicationPath.arg(sockets[0]));

    QProcess* webProcess = new QtWebProcess();
    webProcess->setProcessChannelMode(QProcess::ForwardedChannels);
    webProcess->start(program);

    // Don't expose the web socket to possible future web processes
    while (fcntl(sockets[0], F_SETFD, FD_CLOEXEC) == -1) {
        if (errno != EINTR) {
            ASSERT_NOT_REACHED();
            delete webProcess;
            return;
        }
    }

    if (!webProcess->waitForStarted()) {
        qDebug() << "Failed to start" << program;
        ASSERT_NOT_REACHED();
        delete webProcess;
        return;
    }

    setpriority(PRIO_PROCESS, webProcess->pid(), 10);

    RunLoop::main()->scheduleWork(WorkItem::create(this, &WebKit::ProcessLauncher::didFinishLaunchingProcess, webProcess, sockets[1]));
}

void ProcessLauncher::terminateProcess()
{
    if (!m_processIdentifier)
        return;

    QObject::connect(m_processIdentifier, SIGNAL(finished(int)), m_processIdentifier, SLOT(deleteLater()), Qt::QueuedConnection);
    m_processIdentifier->terminate();
}

void ProcessLauncher::platformInvalidate()
{

}

} // namespace WebKit

#include "ProcessLauncherQt.moc"