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//
// SharedMemoryImpl.cpp
//
// Library: Foundation
// Package: Processes
// Module: SharedMemoryImpl
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/SharedMemory_WIN32.h"
#include "Poco/Error.h"
#include "Poco/Exception.h"
#include "Poco/File.h"
#include "Poco/Format.h"
#if defined (POCO_WIN32_UTF8)
#include "Poco/UnicodeConverter.h"
#endif
#include "Poco/UnWindows.h"
namespace Poco {
SharedMemoryImpl::SharedMemoryImpl(const std::string& name, std::size_t size, SharedMemory::AccessMode mode, const void*, bool):
_name(name),
_memHandle(INVALID_HANDLE_VALUE),
_fileHandle(INVALID_HANDLE_VALUE),
_size(static_cast<DWORD>(size)),
_mode(PAGE_READONLY),
_address(0)
{
if (mode == SharedMemory::AM_WRITE)
_mode = PAGE_READWRITE;
#if defined (POCO_WIN32_UTF8)
std::wstring utf16name;
UnicodeConverter::toUTF16(_name, utf16name);
_memHandle = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL, _mode, 0, _size, utf16name.c_str());
#else
_memHandle = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL, _mode, 0, _size, _name.c_str());
#endif
if (!_memHandle)
{
DWORD dwRetVal = GetLastError();
#if defined (_WIN32_WCE)
throw SystemException(format("Cannot create shared memory object %s [Error %d: %s]", _name, static_cast<int>(dwRetVal), Error::getMessage(dwRetVal)));
#else
if (_mode != PAGE_READONLY || dwRetVal != 5)
throw SystemException(format("Cannot create shared memory object %s [Error %d: %s]", _name, static_cast<int>(dwRetVal), Error::getMessage(dwRetVal)));
#if defined (POCO_WIN32_UTF8)
_memHandle = OpenFileMappingW(PAGE_READONLY, FALSE, utf16name.c_str());
#else
_memHandle = OpenFileMappingA(PAGE_READONLY, FALSE, _name.c_str());
#endif
if (!_memHandle)
{
dwRetVal = GetLastError();
throw SystemException(format("Cannot open shared memory object %s [Error %d: %s]", _name, static_cast<int>(dwRetVal), Error::getMessage(dwRetVal)));
}
#endif
}
map();
}
SharedMemoryImpl::SharedMemoryImpl(const Poco::File& file, SharedMemory::AccessMode mode, const void*):
_name(file.path()),
_memHandle(INVALID_HANDLE_VALUE),
_fileHandle(INVALID_HANDLE_VALUE),
_size(0),
_mode(PAGE_READONLY),
_address(0)
{
if (!file.exists() || !file.isFile())
throw FileNotFoundException(_name);
_size = static_cast<DWORD>(file.getSize());
DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
DWORD fileMode = GENERIC_READ;
if (mode == SharedMemory::AM_WRITE)
{
_mode = PAGE_READWRITE;
fileMode |= GENERIC_WRITE;
}
#if defined (POCO_WIN32_UTF8)
std::wstring utf16name;
UnicodeConverter::toUTF16(_name, utf16name);
_fileHandle = CreateFileW(utf16name.c_str(), fileMode, shareMode, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
#else
_fileHandle = CreateFileA(_name.c_str(), fileMode, shareMode, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
#endif
if (_fileHandle == INVALID_HANDLE_VALUE)
throw OpenFileException("Cannot open memory mapped file", _name);
_memHandle = CreateFileMapping(_fileHandle, NULL, _mode, 0, 0, NULL);
if (!_memHandle)
{
DWORD dwRetVal = GetLastError();
CloseHandle(_fileHandle);
_fileHandle = INVALID_HANDLE_VALUE;
throw SystemException(format("Cannot map file into shared memory %s [Error %d: %s]", _name, (int)dwRetVal, Error::getMessage(dwRetVal)));
}
map();
}
SharedMemoryImpl::~SharedMemoryImpl()
{
unmap();
close();
}
void SharedMemoryImpl::map()
{
DWORD access = FILE_MAP_READ;
if (_mode == PAGE_READWRITE)
access = FILE_MAP_WRITE;
LPVOID addr = MapViewOfFile(_memHandle, access, 0, 0, _size);
if (!addr)
{
DWORD dwRetVal = GetLastError();
throw SystemException(format("Cannot map shared memory object %s [Error %d: %s]", _name, (int)dwRetVal, Error::getMessage(dwRetVal)));
}
_address = static_cast<char*>(addr);
}
void SharedMemoryImpl::unmap()
{
if (_address)
{
UnmapViewOfFile(_address);
_address = 0;
return;
}
}
void SharedMemoryImpl::close()
{
if (_memHandle != INVALID_HANDLE_VALUE)
{
CloseHandle(_memHandle);
_memHandle = INVALID_HANDLE_VALUE;
}
if (_fileHandle != INVALID_HANDLE_VALUE)
{
CloseHandle(_fileHandle);
_fileHandle = INVALID_HANDLE_VALUE;
}
}
} // namespace Poco
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