1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsharedmemory.h"
#include "qsharedmemory_p.h"
#include "qsystemsemaphore.h"
#include "qcore_symbian_p.h"
#include <qdebug.h>
QT_BEGIN_NAMESPACE
#ifndef QT_NO_SHAREDMEMORY
#define QSHAREDMEMORY_DEBUG
QSharedMemoryPrivate::QSharedMemoryPrivate() : QObjectPrivate(),
memory(0), size(0), error(QSharedMemory::NoError),
systemSemaphore(QString()), lockedByMe(false)
{
}
void QSharedMemoryPrivate::setErrorString(const QString &function, TInt errorCode)
{
if (errorCode == KErrNone)
return;
switch (errorCode) {
case KErrAlreadyExists:
error = QSharedMemory::AlreadyExists;
errorString = QSharedMemory::tr("%1: already exists").arg(function);
break;
case KErrNotFound:
error = QSharedMemory::NotFound;
errorString = QSharedMemory::tr("%1: doesn't exists").arg(function);
break;
case KErrArgument:
error = QSharedMemory::InvalidSize;
errorString = QSharedMemory::tr("%1: invalid size").arg(function);
break;
case KErrNoMemory:
error = QSharedMemory::OutOfResources;
errorString = QSharedMemory::tr("%1: out of resources").arg(function);
break;
case KErrPermissionDenied:
error = QSharedMemory::PermissionDenied;
errorString = QSharedMemory::tr("%1: permission denied").arg(function);
break;
default:
errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(errorCode);
error = QSharedMemory::UnknownError;
#if defined QSHAREDMEMORY_DEBUG
qDebug() << errorString << "key" << key;
#endif
}
}
key_t QSharedMemoryPrivate::handle()
{
// Not really cost effective to check here if shared memory is attachable, as it requires
// exactly the same call as attaching, so always assume handle is valid and return failure
// from attach.
return 1;
}
bool QSharedMemoryPrivate::cleanHandle()
{
chunk.Close();
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;
}
TPtrC ptr(qt_QString2TPtrC(nativeKey));
TInt err = chunk.CreateGlobal(ptr, size, size);
setErrorString(function, err);
if (err != KErrNone)
return false;
// Zero out the created chunk
Mem::FillZ(chunk.Base(), chunk.Size());
return true;
}
bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode /* mode */)
{
// Grab a pointer to the memory block
if (!chunk.Handle()) {
QString function = QLatin1String("QSharedMemory::handle");
if (nativeKey.isEmpty()) {
error = QSharedMemory::KeyError;
errorString = QSharedMemory::tr("%1: unable to make key").arg(function);
return false;
}
TPtrC ptr(qt_QString2TPtrC(nativeKey));
TInt err = KErrNoMemory;
err = chunk.OpenGlobal(ptr, false);
if (err != KErrNone) {
setErrorString(function, err);
return false;
}
}
size = chunk.Size();
memory = chunk.Base();
return true;
}
bool QSharedMemoryPrivate::detach()
{
chunk.Close();
memory = 0;
size = 0;
return true;
}
#endif //QT_NO_SHAREDMEMORY
QT_END_NAMESPACE
|
