Undo supposed fix for Issue #15798 until I understand why this is

causing test_multiprocessing_forkserver and test_multiprocessing_spawn
failures on head (3.4).

2 files changed, 1 insertions, 25 deletions

diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index a659087..c3a2788 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -1368,10 +1368,7 @@ class Popen(object):
                         executable_list = tuple(
                             os.path.join(os.fsencode(dir), executable)
                             for dir in os.get_exec_path(env))
-                    # Never close stdin, stdout and stderr for the child.
-                    fds_to_keep = {0,1,2}
-                    fds_to_keep.update(pass_fds)
-                    # Our child uses this one to signal error before exec().
+                    fds_to_keep = set(pass_fds)
                     fds_to_keep.add(errpipe_write)
                     self.pid = _posixsubprocess.fork_exec(
                             args, executable_list,
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index f5a70a3..77f1ba3 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -1559,27 +1559,6 @@ class POSIXProcessTestCase(BaseTestCase):
         # all standard fds closed.
         self.check_close_std_fds([0, 1, 2])
 
-    def test_small_errpipe_write_fd(self):
-        """Issue #15798: Popen should work when stdio fds are available."""
-        new_stdin = os.dup(0)
-        new_stdout = os.dup(1)
-        try:
-            os.close(0)
-            os.close(1)
-
-            # Side test: if errpipe_write fails to have its CLOEXEC
-            # flag set this should cause the parent to think the exec
-            # failed.  Extremely unlikely: everyone supports CLOEXEC.
-            subprocess.Popen([
-                    sys.executable, "-c",
-                    "print('AssertionError:0:CLOEXEC failure.')"]).wait()
-        finally:
-            # Restore original stdin and stdout
-            os.dup2(new_stdin, 0)
-            os.dup2(new_stdout, 1)
-            os.close(new_stdin)
-            os.close(new_stdout)
-
     def test_remapping_std_fds(self):
         # open up some temporary files
         temps = [mkstemp() for i in range(3)]