Fix the fork_exec() calls. tests pass.

Lib/subprocess.py

@@ -1778,8 +1778,8 @@ class Popen(object):
                             errread, errwrite,
                             errpipe_read, errpipe_write,
                             restore_signals, start_new_session,
-                            gid, gids, uid, umask,
-                            preexec_fn, setpgid)
+                            setpgid, gid, gids, uid, umask,
+                            preexec_fn)
                     self._child_created = True
                 finally:
                     # be sure the FD is closed no matter what

Lib/test/test_subprocess.py

@@ -3105,7 +3105,7 @@ class POSIXProcessTestCase(BaseTestCase):
                         True, (), cwd, env_list,
                         -1, -1, -1, -1,
                         1, 2, 3, 4,
-                        True, True,
+                        True, True, 0,
                         False, [], 0, -1,
                         func)
                 # Attempt to prevent
@@ -3154,7 +3154,7 @@ class POSIXProcessTestCase(BaseTestCase):
                         True, fds_to_keep, None, [b"env"],
                         -1, -1, -1, -1,
                         1, 2, 3, 4,
-                        True, True,
+                        True, True, 0,
                         None, None, None, -1,
                         None)
                 self.assertIn('fds_to_keep', str(c.exception))