mirror of https://github.com/qt/qtbase.git
223 lines
7.3 KiB
C++
223 lines
7.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qsharedmemory.h"
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#include "qsharedmemory_p.h"
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#include "qsystemsemaphore.h"
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#include <qdebug.h>
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#include <qt_windows.h>
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QT_BEGIN_NAMESPACE
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#ifndef QT_NO_SHAREDMEMORY
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QSharedMemoryPrivate::QSharedMemoryPrivate() : QObjectPrivate(),
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memory(0), size(0), error(QSharedMemory::NoError),
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systemSemaphore(QString()), lockedByMe(false), hand(0)
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{
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}
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void QSharedMemoryPrivate::setErrorString(const QString &function)
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{
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BOOL windowsError = GetLastError();
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if (windowsError == 0)
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return;
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switch (windowsError) {
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case ERROR_ALREADY_EXISTS:
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error = QSharedMemory::AlreadyExists;
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errorString = QSharedMemory::tr("%1: already exists").arg(function);
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break;
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case ERROR_FILE_NOT_FOUND:
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#ifdef Q_OS_WINCE
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// This happens on CE only if no file is present as CreateFileMappingW
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// bails out with this error code
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case ERROR_INVALID_PARAMETER:
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#endif
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error = QSharedMemory::NotFound;
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errorString = QSharedMemory::tr("%1: doesn't exist").arg(function);
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break;
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case ERROR_COMMITMENT_LIMIT:
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error = QSharedMemory::InvalidSize;
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errorString = QSharedMemory::tr("%1: invalid size").arg(function);
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break;
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case ERROR_NO_SYSTEM_RESOURCES:
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case ERROR_NOT_ENOUGH_MEMORY:
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error = QSharedMemory::OutOfResources;
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errorString = QSharedMemory::tr("%1: out of resources").arg(function);
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break;
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case ERROR_ACCESS_DENIED:
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error = QSharedMemory::PermissionDenied;
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errorString = QSharedMemory::tr("%1: permission denied").arg(function);
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break;
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default:
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errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(windowsError);
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error = QSharedMemory::UnknownError;
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#if defined QSHAREDMEMORY_DEBUG
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qDebug() << errorString << "key" << key;
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#endif
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}
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}
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HANDLE QSharedMemoryPrivate::handle()
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{
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if (!hand) {
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QString function = QLatin1String("QSharedMemory::handle");
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if (nativeKey.isEmpty()) {
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error = QSharedMemory::KeyError;
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errorString = QSharedMemory::tr("%1: unable to make key").arg(function);
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return 0;
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}
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#if defined(Q_OS_WINPHONE)
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Q_UNIMPLEMENTED();
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hand = 0;
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#elif defined(Q_OS_WINRT)
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hand = CreateFileMappingFromApp(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, (PCWSTR)nativeKey.utf16());
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#elif defined(Q_OS_WINCE)
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// This works for opening a mapping too, but always opens it with read/write access in
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// attach as it seems.
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hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, 0, (wchar_t*)nativeKey.utf16());
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#else
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hand = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, (wchar_t*)nativeKey.utf16());
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#endif
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if (!hand) {
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setErrorString(function);
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return 0;
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}
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}
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return hand;
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}
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bool QSharedMemoryPrivate::cleanHandle()
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{
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if (hand != 0 && !CloseHandle(hand)) {
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hand = 0;
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setErrorString(QLatin1String("QSharedMemory::cleanHandle"));
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return false;
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}
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hand = 0;
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return true;
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}
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bool QSharedMemoryPrivate::create(int size)
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{
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QString function = QLatin1String("QSharedMemory::create");
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if (nativeKey.isEmpty()) {
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error = QSharedMemory::KeyError;
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errorString = QSharedMemory::tr("%1: key error").arg(function);
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return false;
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}
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// Create the file mapping.
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#if defined(Q_OS_WINPHONE)
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Q_UNIMPLEMENTED();
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Q_UNUSED(size)
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hand = 0;
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#elif defined(Q_OS_WINRT)
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hand = CreateFileMappingFromApp(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, size, (PCWSTR)nativeKey.utf16());
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#else
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hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, size, (wchar_t*)nativeKey.utf16());
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#endif
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setErrorString(function);
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// hand is valid when it already exists unlike unix so explicitly check
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if (error == QSharedMemory::AlreadyExists || !hand)
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return false;
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return true;
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}
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bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode)
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{
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// Grab a pointer to the memory block
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int permissions = (mode == QSharedMemory::ReadOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS);
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#if defined(Q_OS_WINPHONE)
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Q_UNIMPLEMENTED();
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Q_UNUSED(mode)
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memory = 0;
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#elif defined(Q_OS_WINRT)
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memory = (void *)MapViewOfFileFromApp(handle(), permissions, 0, 0);
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#else
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memory = (void *)MapViewOfFile(handle(), permissions, 0, 0, 0);
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#endif
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if (0 == memory) {
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setErrorString(QLatin1String("QSharedMemory::attach"));
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cleanHandle();
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return false;
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}
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// Grab the size of the memory we have been given (a multiple of 4K on windows)
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MEMORY_BASIC_INFORMATION info;
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if (!VirtualQuery(memory, &info, sizeof(info))) {
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// Windows doesn't set an error code on this one,
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// it should only be a kernel memory error.
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error = QSharedMemory::UnknownError;
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errorString = QSharedMemory::tr("%1: size query failed").arg(QLatin1String("QSharedMemory::attach: "));
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return false;
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}
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size = info.RegionSize;
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return true;
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}
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bool QSharedMemoryPrivate::detach()
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{
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// umap memory
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#if defined(Q_OS_WINPHONE)
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Q_UNIMPLEMENTED();
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return false;
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#else
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if (!UnmapViewOfFile(memory)) {
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setErrorString(QLatin1String("QSharedMemory::detach"));
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return false;
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}
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#endif
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memory = 0;
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size = 0;
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// close handle
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return cleanHandle();
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}
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#endif //QT_NO_SHAREDMEMORY
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QT_END_NAMESPACE
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