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.Net Socket keep-alive extension

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Sets the keep-alive interval for the socket.

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  1. namespace System.Net.Sockets
  2. {
  3. 	public static class SocketExtensions
  4. 	{
  5. 		private const int BytesPerLong = 4; // 32 / 8
  6. 		private const int BitsPerByte = 8;
  7.  
  8. 		/// <summary>
  9. 		/// Sets the keep-alive interval for the socket.
  10. 		/// </summary>
  11. 		/// <param name="socket">The socket.</param>
  12. 		/// <param name="time">Time between two keep alive "pings".</param>
  13. 		/// <param name="interval">Time between two keep alive "pings" when first one fails.</param>
  14. 		/// <returns>If the keep alive infos were succefully modified.</returns>
  15. 		public static bool SetKeepAlive(this Socket socket, ulong time, ulong interval)
  16. 		{
  17. 			try
  18. 			{
  19. 				// Array to hold input values.
  20. 				var input = new[]
  21.             	{
  22.             		(time == 0 || interval == 0) ? 0UL : 1UL, // on or off
  23. 					time,
  24. 					interval
  25. 				};
  26.  
  27. 				// Pack input into byte struct.
  28. 				byte[] inValue = new byte[3 * BytesPerLong];
  29. 				for (int i = 0; i < input.Length; i++)
  30. 				{
  31. 					inValue[i * BytesPerLong + 3] = (byte)(input[i] >> ((BytesPerLong - 1) * BitsPerByte) & 0xff);
  32. 					inValue[i * BytesPerLong + 2] = (byte)(input[i] >> ((BytesPerLong - 2) * BitsPerByte) & 0xff);
  33. 					inValue[i * BytesPerLong + 1] = (byte)(input[i] >> ((BytesPerLong - 3) * BitsPerByte) & 0xff);
  34. 					inValue[i * BytesPerLong + 0] = (byte)(input[i] >> ((BytesPerLong - 4) * BitsPerByte) & 0xff);
  35. 				}
  36.  
  37. 				// Create bytestruct for result (bytes pending on server socket).
  38. 				byte[] outValue = BitConverter.GetBytes(0);
  39.  
  40. 				// Write SIO_VALS to Socket IOControl.
  41. 				socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.KeepAlive, true);
  42. 				socket.IOControl(IOControlCode.KeepAliveValues, inValue, outValue);
  43. 			}
  44. 			catch (SocketException e)
  45. 			{
  46. 				Console.WriteLine("Failed to set keep-alive: {0} {1}", e.ErrorCode, e);
  47. 				return false;
  48. 			}
  49.  
  50. 			return true;
  51. 		}
  52. 	}
  53. }

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