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_WINPHONE)
Q_UNIMPLEMENTED();
Q_UNUSED(mode)
memory = 0;
#elif 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;
}
void*
mono_file_map (size_t length, int flags, int fd, guint64 offset, void **ret_handle)
{
void *ptr;
int mflags = 0;
HANDLE file, mapping;
int prot = mono_mmap_win_prot_from_flags (flags);
mflags = FILE_MAP_READ;
if (flags & MONO_MMAP_WRITE)
mflags = FILE_MAP_COPY;
file = (HANDLE) _get_osfhandle (fd);
mapping = CreateFileMappingFromApp (file, NULL, prot, length, NULL);
if (mapping == NULL)
return NULL;
ptr = MapViewOfFileFromApp (mapping, mflags, offset, length);
if (ptr == NULL) {
CloseHandle (mapping);
return NULL;
}
*ret_handle = (void*)mapping;
return ptr;
}
