#4841: Fix FileIO constructor to honor closefd when called repeatedly

Patch by Victor Stinner.

Lib/test/test_io.py

@@ -634,6 +634,19 @@ class IOTest(unittest.TestCase):
         for obj in test:
             self.assertTrue(hasattr(obj, "__dict__"))
 
+    def test_fileio_closefd(self):
+        # Issue #4841
+        with self.open(__file__, 'rb') as f1, \
+             self.open(__file__, 'rb') as f2:
+            fileio = self.FileIO(f1.fileno(), closefd=False)
+            # .__init__() must not close f1
+            fileio.__init__(f2.fileno(), closefd=False)
+            f1.readline()
+            # .close() must not close f2
+            fileio.close()
+            f2.readline()
+
+
 class CIOTest(IOTest):
 
     def test_IOBase_finalize(self):

Modules/_io/fileio.c

@@ -227,10 +227,14 @@ fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
 
     assert(PyFileIO_Check(oself));
     if (self->fd >= 0) {
+        if (self->closefd) {
             /* Have to close the existing file first. */
             if (internal_close(self) < 0)
                 return -1;
         }
+        else
+            self->fd = -1;
+    }
 
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|si:fileio",
                                      kwlist, &nameobj, &mode, &closefd))