--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/embedded/qwssharedmemory.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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 "qwssharedmemory_p.h"
+
+#if !defined(QT_NO_QWS_MULTIPROCESS)
+
+#include <sys/shm.h>
+
+QT_BEGIN_NAMESPACE
+
+QWSSharedMemory::QWSSharedMemory()
+    : shmBase(0), shmSize(0), character(0),  shmId(-1), key(-1)
+{
+}
+
+
+QWSSharedMemory::~QWSSharedMemory()
+{
+    detach();
+}
+
+/*
+  man page says:
+    On  Linux,  it is possible to attach a shared memory segment even if it
+    is already marked to be deleted.  However, POSIX.1-2001 does not  spec-
+    ify this behaviour and many other implementations do not support it.
+*/
+
+bool QWSSharedMemory::create(int size)
+{
+    if (shmId != -1)
+        detach();
+    shmId = shmget(IPC_PRIVATE, size, IPC_CREAT|0600);
+
+    if (shmId == -1) {
+#ifdef QT_SHM_DEBUG
+        perror("QWSSharedMemory::create allocating shared memory");
+        qWarning("Error allocating shared memory of size %d", size);
+#endif
+        return false;
+    }
+    shmBase = shmat(shmId,0,0);
+    shmctl(shmId, IPC_RMID, 0);
+    if (shmBase == (void*)-1) {
+#ifdef QT_SHM_DEBUG
+        perror("QWSSharedMemory::create attaching to shared memory");
+        qWarning("Error attaching to shared memory id %d", shmId);
+#endif
+        shmBase = 0;
+        return false;
+    }
+    return true;
+}
+
+bool QWSSharedMemory::attach(int id)
+{
+    if (shmId == id)
+        return id != -1;
+    if (shmId != -1)
+        detach();
+
+    shmBase = shmat(id,0,0);
+    if (shmBase == (void*)-1) {
+#ifdef QT_SHM_DEBUG
+        perror("QWSSharedMemory::attach attaching to shared memory");
+        qWarning("Error attaching to shared memory 0x%x of size %d",
+                 id, size());
+#endif
+        shmBase = 0;
+        return false;
+    }
+    shmId = id;
+    return true;
+}
+
+
+void QWSSharedMemory::detach ()
+{
+    if (!shmBase)
+        return;
+    shmdt (shmBase);
+    shmBase = 0;
+    shmSize = 0;
+    shmId = -1;
+}
+
+void QWSSharedMemory::setPermissions (mode_t mode)
+{
+  struct shmid_ds shm;
+  shmctl (shmId, IPC_STAT, &shm);
+  shm.shm_perm.mode = mode;
+  shmctl (shmId, IPC_SET, &shm);
+}
+
+int QWSSharedMemory::size () const
+{
+    struct shmid_ds shm;
+    shmctl (shmId, IPC_STAT, &shm);
+    return shm.shm_segsz;
+}
+
+
+// old API
+
+
+
+QWSSharedMemory::QWSSharedMemory (int size, const QString &filename, char c)
+{
+  shmSize = size;
+  shmFile = filename;
+  shmBase = 0;
+  shmId = -1;
+  character = c;
+  key = ftok (shmFile.toLatin1().constData(), c);
+}
+
+
+
+bool QWSSharedMemory::create ()
+{
+  shmId = shmget (key, shmSize, IPC_CREAT | 0666);
+  return (shmId != -1);
+}
+
+void QWSSharedMemory::destroy ()
+{
+    if (shmId != -1)
+        shmctl(shmId, IPC_RMID, 0);
+}
+
+bool QWSSharedMemory::attach ()
+{
+  if (shmId == -1)
+    shmId = shmget (key, shmSize, 0);
+
+  shmBase = shmat (shmId, 0, 0);
+  if ((long)shmBase == -1)
+      shmBase = 0;
+
+  return (long)shmBase != 0;
+}
+
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_QWS_MULTIPROCESS