implement POSIX dirfd()

add unit tests
update doc
python · giampaolo · giampaolo · giampaolo · Dec 19, 2019 · giampaolo
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
+    fd = dirfd(self->dirp);
+    if (fd == -1)
+        return path_error(&self->path);
+    return Py_BuildValue("i", fd);
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
+        PyErr_SetString(PyExc_ValueError, "I/O operation on closed directory");
+        return NULL;
+    }
+    fd = dirfd(self->dirp);
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
@@ -169,6 +169,9 @@ Exposed the Linux-specific :func:`os.pidfd_open` (:issue:`38692`) and
 :data:`os.P_PIDFD` (:issue:`38713`) for process management with file
 descriptors.

+Added :meth:`~os.scandir.dirfd` method.
diff --git a/Misc/NEWS.d/next/Library/2019-12-19-19-37-01.bpo-39099.bZ8tpO.rst b/Misc/NEWS.d/next/Library/2019-12-19-19-37-01.bpo-39099.bZ8tpO.rst
@@ -0,0 +1,2 @@
+os.scandir() object has a new dirfd() method.  (patch contributed by