private void CreateMemoryMap(ulong sharedMemorySize)
{
if (Native.FileTruncate(sharedMemoryHandle, (long)sharedMemorySize) == -1)
{
int errno = Marshal.GetLastWin32Error();
throw new FileNotFoundException(
$"Failed to ftruncate {sharedMemoryMapName} {sharedMemoryHandle}",
innerException: new Win32Exception(errno));
}
Buffer = Native.MapMemory(
address: IntPtr.Zero,
length: sharedMemorySize,
protFlags: Native.ProtFlags.PROT_READ | Native.ProtFlags.PROT_WRITE,
mapFlags: Native.MapFlags.MAP_SHARED,
handle: sharedMemoryHandle,
offset: 0);
if (Buffer == Native.InvalidPointer)
{
int errno = Marshal.GetLastWin32Error();
throw new InvalidOperationException(
$"Failed to mmap {sharedMemoryMapName} {sharedMemoryHandle}",
innerException: new Win32Exception(errno));
}
MemSize = sharedMemorySize;
}
private SharedMemoryMapView(string sharedMemoryMapName, ulong sharedMemorySize, Native.OpenFlags openFlags)
{
this.sharedMemoryMapName = sharedMemoryMapName;
// Create shared memory view.
//
sharedMemoryHandle = Native.SharedMemoryOpen(
sharedMemoryMapName,
openFlags,
Native.ModeFlags.S_IRUSR | Native.ModeFlags.S_IWUSR);
if (sharedMemoryHandle.IsInvalid)
{
int errno = Marshal.GetLastWin32Error();
throw new FileNotFoundException(
$"Failed to shm_open {sharedMemoryMapName}",
innerException: new Win32Exception(errno));
}
if (Native.FileTruncate(sharedMemoryHandle, (long)sharedMemorySize) == -1)
{
int errno = Marshal.GetLastWin32Error();
throw new FileNotFoundException(
$"Failed to ftruncate {sharedMemoryMapName} {sharedMemoryHandle}",
innerException: new Win32Exception(errno));
}
Buffer = Native.MapMemory(
address: IntPtr.Zero,
length: sharedMemorySize,
protFlags: Native.ProtFlags.PROT_READ | Native.ProtFlags.PROT_WRITE,
mapFlags: Native.MapFlags.MAP_SHARED,
handle: sharedMemoryHandle,
offset: 0);
if (Buffer == Native.InvalidPointer)
{
int errno = Marshal.GetLastWin32Error();
throw new InvalidOperationException(
$"Failed to mmap {sharedMemoryMapName} {sharedMemoryHandle}",
innerException: new Win32Exception(errno));
}
MemSize = sharedMemorySize;
}
