[Mono-bugs] [Bug 76075][Nor] New - Cannot write to named pipe using FileStream

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Mon Sep 12 18:49:55 EDT 2005

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Changed by fcantelmi at bloomberg.net.


--- shadow/76075	2005-09-12 18:49:55.000000000 -0400
+++ shadow/76075.tmp.28909	2005-09-12 18:49:55.000000000 -0400
@@ -0,0 +1,66 @@
+Bug#: 76075
+Product: Mono: Runtime
+Version: 1.1
+OS: Debian Woody
+OS Details: Debian Sid
+Status: NEW   
+Priority: Normal
+Component: io-layer
+AssignedTo: dick at ximian.com                            
+ReportedBy: fcantelmi at bloomberg.net               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+Summary: Cannot write to named pipe using FileStream
+Description of Problem:
+Cannot write to named pipe using FileStream. 
+It looks like CanSeek is 'true' in System.IO.FileStream:FlushBuffer which
+leads to MonoIO.Seek throwing an exception.  CanSeek wraps an istance
+variable which is set in the constructor based upon the return value of
+Steps to reproduce the problem:
+1. run "mkfifo my_fifo" on the Linux command line
+2. run cat my_fifo in a separate window
+3. edit NamedPipe.cs as
+using System;
+using System.IO;
+public class NamedPipe {
+  public static void Main(string[] args) { 
+    try {
+      using(Stream s = new FileStream("my_fifo", System.IO.FileMode.Open)) {
+	TextWriter tw = new StreamWriter(s);
+	tw.WriteLine(DateTime.Now);
+	tw.Flush();
+      }
+    } catch (Exception ex){
+      Console.WriteLine(ex.StackTrace);
+    }
+  }
+4. run "mcs NamedPipe.cs -main:NamedPipe"
+4. run "mono NamedPipe.exe"
+Actual Results:
+in <0x00085> System.IO.FileStream:FlushBuffer ()
+in (wrapper remoting-invoke-with-check) System.IO.FileStream:FlushBuffer ()
+in <0x0002b> System.IO.FileStream:Dispose (Boolean disposing)
+in <0x00010> System.IO.FileStream:Close ()
+in <0x0000b> System.IO.Stream:System.IDisposable.Dispose ()
+in <0x000b3> NamedPipe:Main (System.String[] args)
+Expected Results:
+I expect the string returned by DateTime.Now.ToString() to appear in the
+window where I am catting my_fifo
+How often does this happen? 
+every time.
+Additional Information:
+thanks.  please let me know how I can help investigate.

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