Bug #1565150: Fix subsecond processing for os.utime on Windows.

Lib/test/test_os.py

@@ -223,6 +223,14 @@ class StatAttributeTests(unittest.TestCase):
         except TypeError:
             pass
 
+    # Restrict test to Win32, since there is no guarantee other
+    # systems support centiseconds
+    if sys.platform == 'win32':
+        def test_1565150(self):
+            t1 = 1159195039.25
+            os.utime(self.fname, (t1, t1))
+            self.assertEquals(os.stat(self.fname).st_mtime, t1)
+
 from test import mapping_tests
 
 class EnvironTests(mapping_tests.BasicTestMappingProtocol):

Misc/NEWS

@@ -49,6 +49,8 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Bug #1565150: Fix subsecond processing for os.utime on Windows.
+
 - Patch #1572724: fix typo ('=' instead of '==') in _msi.c.
 
 - Bug #1572832: fix a bug in ISO-2022 codecs which may cause segfault

Modules/posixmodule.c

@@ -792,7 +792,7 @@ time_t_to_FILE_TIME(int time_in, int nsec_in, FILETIME *out_ptr)
 	/* XXX endianness */
 	__int64 out;
 	out = time_in + secs_between_epochs;
-	out = out * 10000000 + nsec_in;
+	out = out * 10000000 + nsec_in / 100;
 	memcpy(out_ptr, &out, sizeof(out));
 }
 
@@ -2501,11 +2501,11 @@ posix_utime(PyObject *self, PyObject *args)
 		if (extract_time(PyTuple_GET_ITEM(arg, 0),
 				 &atimesec, &ausec) == -1)
 			goto done;
-		time_t_to_FILE_TIME(atimesec, ausec, &atime);
+		time_t_to_FILE_TIME(atimesec, 1000*ausec, &atime);
 		if (extract_time(PyTuple_GET_ITEM(arg, 1),
 				 &mtimesec, &musec) == -1)
 			goto done;
-		time_t_to_FILE_TIME(mtimesec, musec, &mtime);
+		time_t_to_FILE_TIME(mtimesec, 1000*musec, &mtime);
 	}
 	if (!SetFileTime(hFile, NULL, &atime, &mtime)) {
 		/* Avoid putting the file name into the error here,