[Mono-bugs] [Bug 77423][Nor] New - Locked file can be wiped out by a StreamWriter

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Changed by lluis at ximian.com.

http://bugzilla.ximian.com/show_bug.cgi?id=77423

--- shadow/77423	2006-01-31 15:53:43.000000000 -0500
+++ shadow/77423.tmp.17555	2006-01-31 15:53:43.000000000 -0500
@@ -0,0 +1,61 @@
+Bug#: 77423
+Product: Mono: Runtime
+Version: 1.1
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: io-layer
+AssignedTo: dick at ximian.com                            
+ReportedBy: lluis at ximian.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Locked file can be wiped out by a StreamWriter
+
+The following test case opens a file with FileShare.None access, so in
+theory it can't be modified by another writer. However, when a StreamWriter
+tries to rewrite the file, although it fails with an exception, the file is
+wiped out.
+
+using System;
+using System.IO;
+using System.Threading;
+
+public class Test
+{
+	static string TheFile = "/tmp/somefile.txt";
+	
+	public static void Main (string[] args)
+	{
+		// Write some file
+		StreamWriter sw = new StreamWriter (TheFile);
+		sw.WriteLine ("Hello!");
+		sw.Close ();
+	
+		// Open and lock the file
+		FileStream s = File.Open (TheFile, FileMode.Open, FileAccess.Read,
+FileShare.None);
+		
+		// Try to modify the locked file
+		try {
+			StreamWriter w = new StreamWriter (TheFile, false);
+			w.Write ("Bye!");
+			w.Close ();
+		} catch {
+			Console.WriteLine ("File was locked!");
+		}
+		
+		s.Close ();
+		
+		// Show the contents
+		StreamReader sr = new StreamReader (TheFile);
+		Console.WriteLine ("Contents: " + sr.ReadToEnd ());
+		sr.Close ();
+
+		File.Delete (TheFile);
+	}
+}