[Mono-dev] question on the Socket class

[Dmitry Key]

Hi, all!

In the C# code below I try to check during given timeout whether host is 
available or not. This code is working fine under .Net with the following 
output:

10035
Time: 5,040425 seconds

For the Mono 1.1.13/Debian

10035
Test Failed:   1,660835 seconds

Could somebody explain what I did wrong in my code?
Ignoring of the socket errors #10035 and #10035 is under suspicion, but I 
have read in the documentation that these errors can be skipped.

using System;
using System.Net;
using System.Net.Sockets;
using System.Collections;

namespace ConsoleApplication1
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	///

	class Class1
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			//
			// TODO: Add code to start application here
			//

			DateTime start = DateTime.Now;

			try
			{//host 1.1.1.1:8080, timeout 5 seconds
				CheckConnection("1.1.1.1", 8080, 5);
			}
			catch(Exception)
			{
				Console.Out.WriteLine("Time: " + 
DateTime.Now.Subtract(start).TotalSeconds.ToString() + " seconds");
				return;
			}

			Console.Out.WriteLine("Test failed: " + 
DateTime.Now.Subtract(start).TotalSeconds.ToString() + " seconds");
			return;
		}

		public static void CheckConnection(string host, int port, int timeout)
		{
			Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, 
ProtocolType.Tcp);
			bool isConnected = false;

			IPHostEntry entries = Dns.GetHostByName(host);
			foreach (IPAddress ipAddr in entries.AddressList)
			{
				sock.Blocking = false;
				try
				{
					sock.Connect(new IPEndPoint(ipAddr, port));
				}
				catch (SocketException ex)
				{
					Console.Out.WriteLine(ex.ErrorCode.ToString());
					// ignore errors:
					// Resource temporarily unavailable.
					// Operation now in progress.
					if (ex.ErrorCode != 10035 && ex.ErrorCode != 10036)
						throw;
				}

				ArrayList checkWrite = new ArrayList();
				checkWrite.Add(sock);
				ArrayList checkError = new ArrayList();
				checkError.Add(sock);

				Socket.Select(null, checkWrite, checkError, timeout * 1000000);
				sock.Blocking = true;
				sock.Close();

				isConnected = checkWrite.Count > 0;

				if (isConnected)
					break;
			}

			if (!isConnected)
				throw new Exception();
		}
	}
}

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