bpo-38109: Add missing constants to Lib/stat.py (GH-16665)

Add missing stat.S_IFDOOR, stat.S_IFPORT, stat.S_IFWHT,
stat.S_ISDOOR, stat.S_ISPORT, and stat.S_ISWHT values to
the Python implementation of the stat module.

Lib/stat.py

@@ -40,6 +40,10 @@ S_IFREG  = 0o100000  # regular file
 S_IFIFO  = 0o010000  # fifo (named pipe)
 S_IFLNK  = 0o120000  # symbolic link
 S_IFSOCK = 0o140000  # socket file
+# Fallbacks for uncommon platform-specific constants
+S_IFDOOR = 0
+S_IFPORT = 0
+S_IFWHT = 0
 
 # Functions to test for each file type
 
@@ -71,6 +75,18 @@ def S_ISSOCK(mode):
     """Return True if mode is from a socket."""
     return S_IFMT(mode) == S_IFSOCK
 
+def S_ISDOOR(mode):
+    """Return True if mode is from a door."""
+    return False
+
+def S_ISPORT(mode):
+    """Return True if mode is from an event port."""
+    return False
+
+def S_ISWHT(mode):
+    """Return True if mode is from a whiteout."""
+    return False
+
 # Names for permission bits
 
 S_ISUID = 0o4000  # set UID bit

Lib/test/test_stat.py

@@ -16,10 +16,10 @@ class TestFilemode:
                   'UF_IMMUTABLE', 'UF_NODUMP', 'UF_NOUNLINK', 'UF_OPAQUE'}
 
     formats = {'S_IFBLK', 'S_IFCHR', 'S_IFDIR', 'S_IFIFO', 'S_IFLNK',
-               'S_IFREG', 'S_IFSOCK'}
+               'S_IFREG', 'S_IFSOCK', 'S_IFDOOR', 'S_IFPORT', 'S_IFWHT'}
 
     format_funcs = {'S_ISBLK', 'S_ISCHR', 'S_ISDIR', 'S_ISFIFO', 'S_ISLNK',
-                    'S_ISREG', 'S_ISSOCK'}
+                    'S_ISREG', 'S_ISSOCK', 'S_ISDOOR', 'S_ISPORT', 'S_ISWHT'}
 
     stat_struct = {
         'ST_MODE': 0,
@@ -231,10 +231,6 @@ class TestFilemode:
 class TestFilemodeCStat(TestFilemode, unittest.TestCase):
     statmod = c_stat
 
-    formats = TestFilemode.formats | {'S_IFDOOR', 'S_IFPORT', 'S_IFWHT'}
-    format_funcs = TestFilemode.format_funcs | {'S_ISDOOR', 'S_ISPORT',
-                                                'S_ISWHT'}
-
 
 class TestFilemodePyStat(TestFilemode, unittest.TestCase):
     statmod = py_stat

Misc/NEWS.d/next/Library/2019-10-10-00-25-28.bpo-38109.9w-IGF.rst

@@ -0,0 +1,3 @@
+Add missing :data:`stat.S_IFDOOR`, :data:`stat.S_IFPORT`, :data:`stat.S_IFWHT`,
+:func:`stat.S_ISDOOR`, :func:`stat.S_ISPORT`, and :func:`stat.S_ISWHT` values to
+the Python implementation of :mod:`stat`.