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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 195 insertions, 0 deletions

diff --git a/src/corelib/kernel/qsharedmemory_win.cpp b/src/corelib/kernel/qsharedmemory_win.cpp
new file mode 100644
index 0000000000..bc13e338bd
--- /dev/null
+++ b/src/corelib/kernel/qsharedmemory_win.cpp
@@ -0,0 +1,195 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore 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 "qsharedmemory.h"
+#include "qsharedmemory_p.h"
+#include "qsystemsemaphore.h"
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_SHAREDMEMORY
+
+QSharedMemoryPrivate::QSharedMemoryPrivate() : QObjectPrivate(),
+        memory(0), size(0), error(QSharedMemory::NoError),
+           systemSemaphore(QString()), lockedByMe(false), hand(0)
+{
+}
+
+void QSharedMemoryPrivate::setErrorString(const QString &function)
+{
+    BOOL windowsError = GetLastError();
+    if (windowsError == 0)
+        return;
+    switch (windowsError) {
+    case ERROR_ALREADY_EXISTS:
+        error = QSharedMemory::AlreadyExists;
+        errorString = QSharedMemory::tr("%1: already exists").arg(function);
+    break;
+    case ERROR_FILE_NOT_FOUND:
+#ifdef Q_OS_WINCE
+        // This happens on CE only if no file is present as CreateFileMappingW
+        // bails out with this error code
+    case ERROR_INVALID_PARAMETER:
+#endif
+        error = QSharedMemory::NotFound;
+        errorString = QSharedMemory::tr("%1: doesn't exist").arg(function);
+        break;
+    case ERROR_COMMITMENT_LIMIT:
+        error = QSharedMemory::InvalidSize;
+        errorString = QSharedMemory::tr("%1: invalid size").arg(function);
+        break;
+    case ERROR_NO_SYSTEM_RESOURCES:
+    case ERROR_NOT_ENOUGH_MEMORY:
+        error = QSharedMemory::OutOfResources;
+        errorString = QSharedMemory::tr("%1: out of resources").arg(function);
+        break;
+    case ERROR_ACCESS_DENIED:
+        error = QSharedMemory::PermissionDenied;
+        errorString = QSharedMemory::tr("%1: permission denied").arg(function);
+        break;
+    default:
+        errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(windowsError);
+        error = QSharedMemory::UnknownError;
+#if defined QSHAREDMEMORY_DEBUG
+        qDebug() << errorString << "key" << key;
+#endif
+    }
+}
+
+HANDLE QSharedMemoryPrivate::handle()
+{
+    if (!hand) {
+        QString function = QLatin1String("QSharedMemory::handle");
+        if (nativeKey.isEmpty()) {
+            error = QSharedMemory::KeyError;
+            errorString = QSharedMemory::tr("%1: unable to make key").arg(function);
+            return false;
+        }
+#ifndef Q_OS_WINCE
+        hand = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, (wchar_t*)nativeKey.utf16());
+#else
+        // This works for opening a mapping too, but always opens it with read/write access in
+        // attach as it seems.
+        hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, 0, (wchar_t*)nativeKey.utf16());
+#endif
+        if (!hand) {
+            setErrorString(function);
+            return false;
+        }
+    }
+    return hand;
+}
+
+bool QSharedMemoryPrivate::cleanHandle()
+{
+    if (hand != 0 && !CloseHandle(hand)) {
+        hand = 0;
+        setErrorString(QLatin1String("QSharedMemory::cleanHandle"));
+        return false;
+    }
+    hand = 0;
+    return true;
+}
+
+bool QSharedMemoryPrivate::create(int size)
+{
+    QString function = QLatin1String("QSharedMemory::create");
+    if (nativeKey.isEmpty()) {
+        error = QSharedMemory::KeyError;
+        errorString = QSharedMemory::tr("%1: key error").arg(function);
+        return false;
+    }
+
+    // Create the file mapping.
+    hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, size, (wchar_t*)nativeKey.utf16());
+    setErrorString(function);
+
+    // hand is valid when it already exists unlike unix so explicitly check
+    if (error == QSharedMemory::AlreadyExists || !hand)
+        return false;
+
+    return true;
+}
+
+bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode)
+{
+    // Grab a pointer to the memory block
+    int permissions = (mode == QSharedMemory::ReadOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS);
+    memory = (void *)MapViewOfFile(handle(), permissions, 0, 0, 0);
+    if (0 == memory) {
+        setErrorString(QLatin1String("QSharedMemory::attach"));
+        cleanHandle();
+        return false;
+    }
+
+    // Grab the size of the memory we have been given (a multiple of 4K on windows)
+    MEMORY_BASIC_INFORMATION info;
+    if (!VirtualQuery(memory, &info, sizeof(info))) {
+        // Windows doesn't set an error code on this one,
+        // it should only be a kernel memory error.
+        error = QSharedMemory::UnknownError;
+        errorString = QSharedMemory::tr("%1: size query failed").arg(QLatin1String("QSharedMemory::attach: "));
+        return false;
+    }
+    size = info.RegionSize;
+
+    return true;
+}
+
+bool QSharedMemoryPrivate::detach()
+{
+    // umap memory
+    if (!UnmapViewOfFile(memory)) {
+        setErrorString(QLatin1String("QSharedMemory::detach"));
+        return false;
+    }
+    memory = 0;
+    size = 0;
+
+    // close handle
+    return cleanHandle();
+}
+
+#endif //QT_NO_SHAREDMEMORY
+
+
+QT_END_NAMESPACE