Define the required fields in FuseStruct derivatives to None if there is no explicit default value.

This helps users to know what fields are there to be assigned,
and makes it possible to iterate over the fields.

Author: dzsekijo

fuse.py

@@ -378,7 +378,17 @@ class Stat(FuseStruct):
     The attributes are undefined by default.
     """
 
-    pass
+    def __init__(self, **kw):
+        self.st_mode  = None
+        self.st_ino   = None
+        self.st_dev   = None
+        self.st_nlink = None
+        self.st_uid   = None
+        self.st_gid   = None
+        self.st_size  = None
+        self.st_atime = None
+        self.st_mtime = None
+        self.st_ctime = None
 
 
 class StatVfs(FuseStruct):
@@ -389,15 +399,15 @@ class StatVfs(FuseStruct):
 
     def __init__(self, **kw):
 
-        self.f_bsize = 0
-        self.f_frsize = 0
-        self.f_blocks = 0
-        self.f_bfree = 0
-        self.f_bavail = 0
-        self.f_files = 0
-        self.f_ffree = 0
-        self.f_favail = 0
-        self.f_flag = 0
+        self.f_bsize   = 0
+        self.f_frsize  = 0
+        self.f_blocks  = 0
+        self.f_bfree   = 0
+        self.f_bavail  = 0
+        self.f_files   = 0
+        self.f_ffree   = 0
+        self.f_favail  = 0
+        self.f_flag    = 0
         self.f_namemax = 0
 
         FuseStruct.__init__(self, **kw)
@@ -430,10 +440,10 @@ class Direntry(FuseStruct):
 
     def __init__(self, name, **kw):
 
-        self.name = name
+        self.name   = name
         self.offset = 0
-        self.type = 0
-        self.ino = 0
+        self.type   = 0
+        self.ino    = 0
 
         FuseStruct.__init__(self, **kw)
 
@@ -446,24 +456,36 @@ class Flock(FuseStruct):
     `l_len`, `l_pid` attributes (`l_whence` is not used by
     FUSE, see ``fuse.h``).
     """
+
+    def __init__(self, name, **kw):
+    
+        self.l_type  = None
+        self.l_start = None
+        self.l_len   = None
+        self.l_pid   = None
 
-    pass
- 
+        FuseStruct.__init__(self, **kw)
+
 
 class Timespec(FuseStruct):
     """
     Cf. struct timespec in time.h:
     http://www.opengroup.org/onlinepubs/009695399/basedefs/time.h.html
     """
 
-    pass
+    def __init__(self, name, **kw):
+    
+        self.tv_sec  = None
+        self.tv_nsec = None
+ 
+        FuseStruct.__init__(self, **kw)
 
 
 class FuseFileInfo(FuseStruct):
 
     def __init__(self, **kw):
 
-        self.keep = False
+        self.keep      = False
         self.direct_io = False
 
         FuseStruct.__init__(self, **kw)