/// <summary>
/// Creates shared memory object.
/// </summary>
public void LowLevel_CreateSharedMemory()
{
if (WindowsAPI.FailureReason != null)
{
throw OperationException.WrapException(WindowsAPI.FailureReason);
}
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string fileMappingName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName, parameters);
this._mapHandle = WindowsAPI.CreateFileMapping((IntPtr)(int)-1, WindowsAPI.AttributesWithNullDACL, WindowsAPI.PAGE_READWRITE, 0, (uint)this._shareSize, fileMappingName);
if (this._mapHandle == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_CanNotCreateOrOpenSharedMemory(Marshal.GetLastWin32Error());
}
this._pointer = WindowsAPI.MapViewOfFile(this._mapHandle, WindowsAPI.SECTION_MAP_READ | WindowsAPI.SECTION_MAP_WRITE, 0, 0, 0);
if (this._pointer == IntPtr.Zero)
{
int lastWinError = Marshal.GetLastWin32Error();
WindowsAPI.CloseHandle(this._mapHandle);
throw GenuineExceptions.Get_Windows_SharedMemoryError(lastWinError);
}
}
// /// <summary>
// /// Creates a new mutex with NULL DACL.
// /// </summary>
// /// <param name="mutex">The mutex.</param>
// /// <param name="name">The name of the mutex.</param>
// static internal void UpgrageMutexSecurity(Mutex mutex, string name)
// {
// CloseHandle(mutex.Handle);
// mutex.Handle = CreateMutex(AttributesWithNullDACL, false, name);
// }
/// <summary>
/// Opens an existent mutex.
/// </summary>
/// <param name="name">The name of the mutex.</param>
/// <returns>The opened mutex.</returns>
static internal Mutex OpenMutex(string name)
{
IntPtr result = OpenMutex(MUTEX_ALL_ACCESS, false, name);
if (result == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_SharedMemoryError(Marshal.GetLastWin32Error());
}
Mutex mutex = new Mutex();
mutex.SafeWaitHandle = new SafeWaitHandle(result, true);
return(mutex);
}
static internal Mutex CreateMutex(string name)
{
IntPtr result = CreateMutex(AttributesWithNullDACL, false, name);
if (result == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_SharedMemoryError(Marshal.GetLastWin32Error());
}
if (Marshal.GetLastWin32Error() == ERROR_ALREADY_EXISTS)
{
throw GenuineExceptions.Get_Windows_SharedMemoryError(Marshal.GetLastWin32Error());
}
Mutex mutex = new Mutex();
mutex.SafeWaitHandle = new SafeWaitHandle(result, true);
return(mutex);
}
/// <summary>
/// Opens the handle of an existent share.
/// </summary>
public void OpenSharedMemory()
{
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string fileMappingName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName, parameters);
this._mapHandle = WindowsAPI.OpenFileMapping(WindowsAPI.FILE_MAP_ALL_ACCESS, 0, fileMappingName);
if (this._mapHandle == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_CanNotCreateOrOpenSharedMemory(Marshal.GetLastWin32Error());
}
this._pointer = WindowsAPI.MapViewOfFile(this._mapHandle, WindowsAPI.SECTION_MAP_READ | WindowsAPI.SECTION_MAP_WRITE, 0, 0, 0);
if (this._pointer == IntPtr.Zero)
{
int lastWinError = Marshal.GetLastWin32Error();
WindowsAPI.CloseHandle(this._mapHandle);
throw GenuineExceptions.Get_Windows_SharedMemoryError(lastWinError);
}
}
static WindowsAPI()
{
NullAttribute = Marshal.AllocHGlobal(SECURITY_DESCRIPTOR_MIN_LENGTH);
if (NullAttribute == IntPtr.Zero)
{
return;
}
try
{
if (!InitializeSecurityDescriptor(NullAttribute, SECURITY_DESCRIPTOR_REVISION))
{
throw GenuineExceptions.Get_Windows_SharedMemoryError(Marshal.GetLastWin32Error());
}
if (!SetSecurityDescriptorDacl(NullAttribute, true, IntPtr.Zero, false))
{
throw GenuineExceptions.Get_Windows_SharedMemoryError(Marshal.GetLastWin32Error());
}
AttributesWithNullDACL = new _SECURITY_ATTRIBUTES();
AttributesWithNullDACL.nLength = 12;
AttributesWithNullDACL.lpSecurityDescriptor = NullAttribute;
AttributesWithNullDACL.bInheritHandle = 1;
}
catch (Exception ex)
{
FailureReason = ex;
try
{
Marshal.FreeHGlobal(NullAttribute);
}
catch (Exception)
{
}
NullAttribute = IntPtr.Zero;
}
}