[Mono-bugs] [Bug 76149][Maj] New - Writing to /dev/ttyACM* fails

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Changed by gustav.petersson at karlskrona.net.

http://bugzilla.ximian.com/show_bug.cgi?id=76149

--- shadow/76149	2005-09-19 14:29:24.000000000 -0400
+++ shadow/76149.tmp.8812	2005-09-19 14:29:24.000000000 -0400
@@ -0,0 +1,170 @@
+Bug#: 76149
+Product: Mono: Class Libraries
+Version: unspecified
+OS: 
+OS Details: Debian 3.1/unstable kernel 2.6.13
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Major
+Component: System
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: gustav.petersson at karlskrona.net               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Writing to /dev/ttyACM* fails
+
+Description of Problem:
+Writing a string to /dev/ttyACM0 fails on FileStream.Flush(). If the
+Flush() call is left out the error shows itself when doing a read (implicit
+Flush())
+
+A small sample program is attached that shows this problem.
+
+Steps to reproduce the problem:
+// created on 9/19/2005 at 6:23 PM
+
+using System;
+using System.IO;
+using System.Text;
+
+/*
+public class NoSeekStream : FileStream
+{
+	public NoSeekStream(string name, FileMode mode, FileAccess access) :
+base(name, mode, access)
+	{
+	}
+	
+	public override bool CanSeek
+	{
+		get { return false; }
+	}
+}
+*/
+
+public class GsmDevice
+{
+	private string myDevicePort = "/dev/ttyACM0";
+	private FileStream myAtStream;
+	private ASCIIEncoding myCmdEncoder;
+	
+	public static void Main(string[] args)
+	{
+		GsmDevice d = new GsmDevice();
+		
+		d.Connect();
+		Console.WriteLine(d.GetModel());
+		d.Disconnect();
+	}
+	
+	public GsmDevice()
+	{
+		myCmdEncoder = new ASCIIEncoding();
+	}
+	
+	public void Connect()
+	{
+		try
+		{
+			myAtStream = new FileStream(myDevicePort, FileMode.Open,
+FileAccess.ReadWrite);
+		}
+		catch(FileNotFoundException ex)
+		{
+			Console.WriteLine("Connect: " + ex.Message);
+		}
+	}
+	
+	public void Disconnect()
+	{
+		try
+		{
+			myAtStream.Close();
+		}
+		catch(Exception ex)
+		{
+			Console.WriteLine("Disconnect: " + ex.Message);
+		}
+	}
+	
+	public string GetModel()
+	{
+		SendCommand("AT+CGMM\r\n");
+		string at = ReadAnswer();
+		
+		return at;
+	}
+	
+	public void SendCommand(string theCommand)
+	{
+		try
+		{
+			byte[] buf = myCmdEncoder.GetBytes(theCommand);
+			Console.Write("Command: " + myCmdEncoder.GetString(buf));
+			myAtStream.Write(buf, 0, buf.Length);
+			myAtStream.Flush();
+		}
+		catch(Exception ex)
+		{
+			Console.WriteLine("SendCommand: " + ex.Message);
+		}
+	}
+	
+	public string ReadAnswer()
+	{
+		string at = "";
+
+		try
+		{
+			byte[] buf = new byte[4096];
+			myAtStream.Read(buf, 0, buf.Length);
+			
+			at = myCmdEncoder.GetString(buf);
+		}
+		catch(Exception ex)
+		{
+			Console.WriteLine("ReadResponse: Exception: " + ex.Message);
+			Console.WriteLine(ex.StackTrace);
+		}
+		
+		return at;
+	}
+}
+
+
+Actual Results:
+Command: AT+CGMM
+SendCommand: Win32 IO returned 25. Path: /dev/ttyACM0
+ReadResponse: Exception: Win32 IO returned 25. Path: /dev/ttyACM0
+in [0x0005a] (at
+/tmp/scratch/BUILD/mono-1.1.9/mcs/class/corlib/System.IO/FileStream.cs:910)
+System.IO.FileStream:FlushBuffer ()
+in [0x00001] (at
+/tmp/scratch/BUILD/mono-1.1.9/mcs/class/corlib/System.IO/FileStream.cs:935)
+System.IO.FileStream:RefillBuffer ()
+in [0x00056] (at
+/tmp/scratch/BUILD/mono-1.1.9/mcs/class/corlib/System.IO/FileStream.cs:450)
+System.IO.FileStream:ReadInternal (System.Byte[] dest, Int32 dest_offset,
+Int32 count)
+in [0x000be] (at
+/tmp/scratch/BUILD/mono-1.1.9/mcs/class/corlib/System.IO/FileStream.cs:417)
+System.IO.FileStream:Read (System.Byte[] dest, Int32 dest_offset, Int32 count)
+in [0x0001c] (at /home/wilco/Projects/gnome-mobile/GsmDevice.cs:97)
+GsmDevice:ReadAnswer ()
+
+Disconnect: Win32 IO returned 25. Path: /dev/ttyACM0
+
+
+Expected Results:
+Command: AT+CGMM
+
+How often does this happen? 
+Every time.
+
+Additional Information:
+
+I've tried this with both the debian supplied mono packages (1.1.8) and the
+latest mono installer (1.1.9). Both are giving the same error.