[Mono-bugs] [Bug 354090] New: Socket.Select throws exception for read-only ILists

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Jan 16 00:54:05 EST 2008


           Summary: Socket.Select throws exception for read-only ILists
           Product: Mono: Class Libraries
           Version: 1.2.4
          Platform: x86
        OS/Version: Kubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: gavin at hexillion.com
         QAContact: mono-bugs at lists.ximian.com
                CC: gavin at hexillion.com
          Found By: Third Party Developer/Partner

The sample code in the Socket.Select documentation passes ArrayLists in as
parameters. However, the method prototype actually specifies ILists, which are
not necessarily mutable. One could argue that mutable ILists should be
required, but the documentation doesn't say that and Microsoft's implementation
accepts read-only ILists (which are replaced during the course of the method

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

class SelectTest {

  public static void Main() {

    Socket socket1 =
      new Socket(AddressFamily.InterNetwork,

    Socket[] writeList = new Socket[1];
    writeList[0] = socket1;

    Socket.Select(null, writeList, null, 10);

    Console.WriteLine( "Writeable sockets: {0}",
                        writeList.Length );

This code yields "Writeable sockets: 1" on Windows .NET 1.1 but results in the
following on Mono 1.2.4 on (K)Ubuntu:

Unhandled Exception: System.NotSupportedException: Operation is not supported.
  at System.Array.System.Collections.IList.Add (System.Object value) [0x00000]
  at System.Net.Sockets.Socket.Select (IList checkRead, IList checkWrite, IList
checkError, Int32 microSeconds) [0x00000]
  at SelectTest.Main () [0x00000]

For callers, this is easy to work around if they can modify their source code.
It's a stopper if only .NET binaries are available.

Found while testing .NET binaries on Mono.

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