From aa1b8a168d8b8dc1dfc426364b7b664501302958 Mon Sep 17 00:00:00 2001
From: pxinwr <peixing.xin@windriver.com>
Date: Sun, 29 Nov 2020 04:21:30 +0800
Subject: [PATCH] bpo-31904: Fix test_os.test_getcwd_long_path() failure for
 VxWorks (GH-20256)

---
 Lib/test/test_os.py                                           | 4 ++++
 .../next/Tests/2020-05-20-17-28-46.bpo-31904.yt83Ge.rst       | 1 +
 2 files changed, 5 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Tests/2020-05-20-17-28-46.bpo-31904.yt83Ge.rst

diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index f127cb199bb..dbb2975c0ee 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -116,6 +116,10 @@ class MiscTests(unittest.TestCase):
         # than MAX_PATH if long paths support is disabled:
         # see RtlAreLongPathsEnabled().
         min_len = 2000   # characters
+        # On VxWorks, PATH_MAX is defined as 1024 bytes. Creating a path
+        # longer than PATH_MAX will fail.
+        if sys.platform == 'vxworks':
+            min_len = 1000
         dirlen = 200     # characters
         dirname = 'python_test_dir_'
         dirname = dirname + ('a' * (dirlen - len(dirname)))
diff --git a/Misc/NEWS.d/next/Tests/2020-05-20-17-28-46.bpo-31904.yt83Ge.rst b/Misc/NEWS.d/next/Tests/2020-05-20-17-28-46.bpo-31904.yt83Ge.rst
new file mode 100644
index 00000000000..1679801a111
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2020-05-20-17-28-46.bpo-31904.yt83Ge.rst
@@ -0,0 +1 @@
+Fix os module failures for VxWorks RTOS.