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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsharedmemory.h"
#include "qsharedmemory_p.h"
#include "qsystemsemaphore.h"
#include <qdebug.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
#ifndef QT_NO_SHAREDMEMORY
QSharedMemoryPrivate::QSharedMemoryPrivate() :
#ifndef QT_NO_QOBJECT
QObjectPrivate(),
#endif
memory(0), size(0), error(QSharedMemory::NoError),
systemSemaphore(QString()), lockedByMe(false), hand(0)
{
}
void QSharedMemoryPrivate::setErrorString(QLatin1String function)
{
DWORD 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:
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) {
const QLatin1String function("QSharedMemory::handle");
if (nativeKey.isEmpty()) {
error = QSharedMemory::KeyError;
errorString = QSharedMemory::tr("%1: unable to make key").arg(function);
return 0;
}
#if defined(Q_OS_WINRT)
hand = OpenFileMappingFromApp(FILE_MAP_ALL_ACCESS, FALSE, reinterpret_cast<PCWSTR>(nativeKey.utf16()));
#else
hand = OpenFileMapping(FILE_MAP_ALL_ACCESS, false,
reinterpret_cast<const wchar_t*>(nativeKey.utf16()));
#endif
if (!hand) {
setErrorString(function);
return 0;
}
}
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)
{
const QLatin1String function("QSharedMemory::create");
if (nativeKey.isEmpty()) {
error = QSharedMemory::KeyError;
errorString = QSharedMemory::tr("%1: key error").arg(function);
return false;
}
// Create the file mapping.
#if defined(Q_OS_WINRT)
hand = CreateFileMappingFromApp(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, size,
reinterpret_cast<PCWSTR>(nativeKey.utf16()));
#else
hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, size,
reinterpret_cast<const wchar_t*>(nativeKey.utf16()));
#endif
setErrorString(function);
// hand is valid when it already exists unlike unix so explicitly check
return error != QSharedMemory::AlreadyExists && hand;
}
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);
#if defined(Q_OS_WINRT)
memory = (void *)MapViewOfFileFromApp(handle(), permissions, 0, 0);
#else
memory = (void *)MapViewOfFile(handle(), permissions, 0, 0, 0);
#endif
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
|
