public static void ioctl(int handle, uint cmd, ref uint arg)
{
if (!_isInitialized)
{
Initialize();
}
switch (cmd)
{
case FIONREAD:
{
UInt32 bytesToRead = 0;
CC3100.CC3100SocketInfo socketInfo = _cc3100.GetSocketInfo(handle);
if (poll(handle, 0 /* SelectRead */, 0))
{
/* if data is available, read it into a buffer in the background and return the actual # of available bytes to read */
lock (socketInfo.SocketReceiveBufferLockObject)
{
Int32 RX_BUFFER_SIZE = 1500;
if (socketInfo.SocketReceiveBuffer == null)
{
socketInfo.SocketReceiveBuffer = new byte[RX_BUFFER_SIZE]; // maximum rx buffer size
}
Int32 bytesRead = _cc3100.sl_Recv(handle, socketInfo.SocketReceiveBuffer, socketInfo.SocketReceiveBufferFirstAvailableIndex,
RX_BUFFER_SIZE - socketInfo.SocketReceiveBufferFirstAvailableIndex, 0);
if (bytesRead >= 0)
{
socketInfo.SocketReceiveBufferFirstAvailableIndex += bytesRead;
}
}
}
// whether or not we retrieved more data into the cached managed-code buffer, return the number of bytes now available.
lock (socketInfo.SocketReceiveBufferLockObject)
{
bytesToRead = (UInt32)socketInfo.SocketReceiveBufferFirstAvailableIndex;
}
arg = bytesToRead;
}
break;
default:
{
throw new NotImplementedException();
}
}
}
public static int recv(int handle, byte[] buf, int offset, int count, int flags, int timeout_ms)
{
if (!_isInitialized)
{
Initialize();
}
/* TODO: enable flags */
if (flags != 0)
{
throw new ArgumentException("flags");
}
/* TODO: enable receive timeout */
//if (timeout_ms != System.Threading.Timeout.Infinite)
// throw new ArgumentOutOfRangeException("timeout_ms");
/* if data is buffered locally, use the local buffer; if not, then read from the CC3100's buffers */
CC3100.CC3100SocketInfo socketInfo = _cc3100.GetSocketInfo(handle);
lock (socketInfo.SocketReceiveBufferLockObject)
{
if (socketInfo.SocketReceiveBuffer != null && socketInfo.SocketReceiveBufferFirstAvailableIndex > 0)
{
Int32 bytesRead = System.Math.Min(count, socketInfo.SocketReceiveBufferFirstAvailableIndex);
Array.Copy(socketInfo.SocketReceiveBuffer, 0, buf, offset, bytesRead);
Array.Copy(socketInfo.SocketReceiveBuffer, bytesRead,
socketInfo.SocketReceiveBuffer, 0, socketInfo.SocketReceiveBufferFirstAvailableIndex - bytesRead);
socketInfo.SocketReceiveBufferFirstAvailableIndex -= bytesRead;
return(bytesRead);
}
}
/* if no data was buffered locally, read from the CC3100's buffers */
Int32 retVal = _cc3100.sl_Recv(handle, buf, offset, count, 0);
if (retVal < 0)
{
throw new CC3100SimpleLinkException(retVal); /* TODO: determine the best exception, based on retVal */
}
return(retVal); // positive value indicates # of bytes received
}
