1 files changed, 169 insertions, 0 deletions
diff --git a/src/kernel/qsharedmemory_p.cpp b/src/kernel/qsharedmemory_p.cpp
new file mode 100644
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+++ b/src/kernel/qsharedmemory_p.cpp
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+/****************************************************************************
+**
+** Provides a standardised interface to shared memory
+**
+** Created : 020124
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the kernel module of the TQt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free TQt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing retquirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at [email protected].
+**
+** Licensees holding valid TQt Commercial licenses may use this file in
+** accordance with the TQt Commercial License Agreement provided with
+** the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qsharedmemory_p.h"
+
+#if !defined(QT_QWS_NO_SHM)
+
+#if defined(QT_POSIX_QSHM)
+#include <fcntl.h>
+#include <sys/mman.h>
+
+TQSharedMemory::TQSharedMemory (int size, TQString filename, char c )
+{
+  shmSize = size;
+  shmFile = filename;
+  character = c;
+  shmFile.append(c);
+}
+
+bool TQSharedMemory::create ()
+{
+  shmFD = shm_open (shmFile.latin1 (), O_RDWR | O_EXCL | O_CREAT, 0666);
+  if (shmFD == -1)
+    return FALSE;
+  else if (ftruncate (shmFD, shmSize) == -1)
+    {
+      close (shmFD);
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+void TQSharedMemory::destroy ()
+{
+  shm_unlink (shmFile.latin1 ());
+}
+
+bool TQSharedMemory::attach ()
+{
+  shmBase = mmap (0, shmSize, PROT_READ | PROT_WRITE, MAP_SHARED, shmFD, 0);
+
+  if (shmBase == MAP_FAILED)
+    return FALSE;
+
+  close (shmFD);
+  return TRUE;
+}
+
+void TQSharedMemory::detach ()
+{
+  munmap (shmBase, shmSize);
+}
+
+void TQSharedMemory::setPermissions (mode_t mode)
+{
+  mprotect (shmBase, shmSize, mode);	// Provide defines to make prot work properly
+}
+
+int TQSharedMemory::size()
+{
+    struct stat buf;
+    int rc = fstat (shmFD, &buf);
+    if (rc != -1)
+        return buf.st_size;
+    else
+        return rc;
+}
+
+#else // Assume SysV for backwards compat
+#include <sys/shm.h>
+
+TQSharedMemory::TQSharedMemory (int size, TQString filename, char c )
+{
+  shmSize = size;
+  shmFile = filename;
+  character = c;
+  key = ftok (shmFile.latin1 (), c);
+  idInitted = FALSE;
+  shmId = -1;
+}
+
+bool TQSharedMemory::create ()
+{
+  shmId = shmget (key, shmSize, IPC_CREAT | 0666);
+  if (shmId == -1)
+    return FALSE;
+  else
+    return TRUE;
+}
+
+void TQSharedMemory::destroy ()
+{
+    if (shmId != -1) {
+        struct shmid_ds shm;
+        shmctl (shmId, IPC_RMID, &shm);
+    }
+}
+
+bool TQSharedMemory::attach ()
+{
+  if (shmId == -1)
+    shmId = shmget (key, shmSize, 0);
+
+  shmBase = shmat (shmId, 0, 0);
+  if ((int) shmBase == -1 || shmBase == 0)
+    return FALSE;
+  else
+    return TRUE;
+}
+
+void TQSharedMemory::detach ()
+{
+  shmdt (shmBase);
+}
+
+void TQSharedMemory::setPermissions (mode_t mode)
+{
+  struct shmid_ds shm;
+  shmctl (shmId, IPC_STAT, &shm);
+  shm.shm_perm.mode = mode;
+  shmctl (shmId, IPC_SET, &shm);
+}
+
+int TQSharedMemory::size ()
+{
+    struct shmid_ds shm;
+    shmctl (shmId, IPC_STAT, &shm);
+    return shm.shm_segsz;
+}
+
+#endif
+
+#endif