* check if the device path is already known first.

* check the path is NOT a directory or a symlink to a directory.
  regular or char/block device are considered both valid path to read 
  from and write to. 


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33257 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/midi/DeviceWatcher.cpp

@@ -181,19 +181,25 @@ DeviceWatcher::_AddDevice(const char* path)
 {
 	// printf("DeviceWatcher::_AddDevice(\"%s\");\n", path);
 
-	BEntry entry(path);
-	if (! entry.IsFile())
-		// Invalid path !
-		return;
-
 	if ( fDeviceEndpointsMap.ContainsKey(path) )
 		// Already known
 		return;
 		
-	int fd = open(path, O_RDWR | O_EXCL);
-	if (fd < 0)
+	BEntry entry(path);
+	if (entry.IsDirectory())
+		// Invalid path !
 		return;
 		
+	if (entry.IsSymLink()) {
+		BEntry symlink(path, true);
+		if (symlink.IsDirectory())
+			// Invalid path!
+			return;
+	}
+
+	int fd = open(path, O_RDWR | O_EXCL);
+	if (fd < 0)
+		return;	
 	
 	MidiPortConsumer* consumer = new MidiPortConsumer(fd, path);
 	_SetIcons(consumer);