* dtable.cc (dtable::build_fhandler): Accept an optional path_conv argument.

If available, use this to calculate path name and device number.
* dtable.h (dtable): Reflect above change.
* fhandler.h (fhandler_base): Declare virtual method which accepts path_conv
rather than path string as first argument.
* fhandler.cc (fhandler_base::open): Define above new method.
* syscalls.cc (_open): Set aside a path_conv variable for use in build_fhandler
and subsequent call to open.

winsup/cygwin/fhandler.cc

@@ -289,6 +289,12 @@ fhandler_base::get_default_fmode (int flags)
   return __fmode;
 }
 
+int
+fhandler_base::open (path_conv& real_path, int flags, mode_t mode)
+{
+  return open ((char *) real_path, flags, mode);
+}
+
 /* Open system call handler function.
    Path is now already checked for symlinks */
 int