private static int ReceiveMessageAndFileDescriptor(
this Socket socket,
Span <byte> buffer,
out IntPtr fileDescriptor)
{
if (socket == null)
{
throw new ArgumentNullException(nameof(socket));
}
unsafe
{
fixed(byte *pinnedData = &buffer.GetPinnableReference())
{
// Message data.
//
IoVec ioVec = default;
ioVec.IovBase = new IntPtr(pinnedData);
ioVec.IovLength = (ulong)buffer.Length;
// #define SOL_SOCKET 1
ControlMessage <int> controlMessage = default;
controlMessage.Header.ControlMessageLength = (ulong)sizeof(ControlMessage <int>);
controlMessage.Header.ControlMessageLevel = 1;
controlMessage.Header.ControlMessageType = SocketLevelMessageType.ScmRights;
controlMessage.Value = 0;
// Construct the message.
//
MessageHeader message = default;
message.MessageName = IntPtr.Zero;
message.MessageNameLength = 0;
message.MessageIoVec = &ioVec;
message.MessageIoVecLength = 1;
message.MessageControl = &controlMessage.Header;
message.MessageControlLength = controlMessage.Header.ControlMessageLength;
// Receive the message.
//
ulong bytesRead = Native.ReceiveMessage(socket.Handle, ref message, 0);
if ((long)bytesRead == -1)
{
throw new SocketException(Marshal.GetLastWin32Error());
}
fileDescriptor = new IntPtr(controlMessage.Value);
int received = checked ((int)bytesRead);
return(received);
}
}
}
/// <summary>
/// Receives the message and passed file descriptor.
/// </summary>
/// <param name="socket"></param>
/// <param name="buffer"></param>
/// <param name="fileDescriptor"></param>
/// <returns></returns>
internal static int ReceiveMessageAndFileDescriptor(
this Socket socket,
out byte[] buffer,
out IntPtr fileDescriptor)
{
if (socket == null)
{
throw new ArgumentNullException(nameof(socket));
}
fileDescriptor = Native.InvalidPointer;
buffer = null;
unsafe
{
Span <byte> messageSpan = stackalloc byte[256];
fixed(byte *pinnedData = &messageSpan.GetPinnableReference())
{
// Message data.
//
IoVec ioVec = default;
ioVec.IovBase = new IntPtr(pinnedData);
ioVec.IovLength = (ulong)messageSpan.Length;
// #define SOL_SOCKET 1
ControlMessage <int> controlMessage = default;
controlMessage.Header.ControlMessageLength = (ulong)sizeof(ControlMessage <int>);
controlMessage.Header.ControlMessageLevel = 1;
controlMessage.Header.ControlMessageType = SocketLevelMessageType.ScmRights;
controlMessage.Value = 0;
// Construct the message.
//
MessageHeader message = default;
message.MessageName = IntPtr.Zero;
message.MessageNameLength = 0;
message.MessageIoVec = &ioVec;
message.MessageIoVecLength = 1;
message.MessageControl = &controlMessage.Header;
message.MessageControlLength = controlMessage.Header.ControlMessageLength;
ulong bytesRead = Native.ReceiveMessage(socket.Handle, ref message, 0);
if ((long)bytesRead == -1)
{
throw new SocketException(Marshal.GetLastWin32Error());
}
int messageSize = checked ((int)bytesRead);
if (messageSize != 0)
{
if (message.MessageControlLength != 0)
{
fileDescriptor = new IntPtr(controlMessage.Value);
}
buffer = messageSpan.Slice(0, messageSize).ToArray();
}
return(messageSize);
}
}
}