private static int SendMessageAndFileDescriptor(
this Socket socket,
ReadOnlySpan <byte> messageData,
IntPtr fileDescriptor)
{
if (socket == null)
{
throw new ArgumentNullException(nameof(socket));
}
if (fileDescriptor == null)
{
throw new ArgumentNullException(nameof(fileDescriptor));
}
unsafe
{
fixed(byte *pinnedData = &messageData.GetPinnableReference())
{
// Message data.
//
IoVec ioVec = default;
ioVec.IovBase = new IntPtr(pinnedData);
ioVec.IovLength = (ulong)messageData.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 = fileDescriptor.ToInt32();
// 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;
// Send the message.
//
ulong bytesSent = Native.SendMessage(socket.Handle, ref message, 0);
if ((long)bytesSent == -1)
{
throw new SocketException(Marshal.GetLastWin32Error());
}
int sent = checked ((int)bytesSent);
return(sent);
}
}
}