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| ****************************************************************************/ |
| |
| #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 |