[3.8] closes bpo-27805: Ignore ESPIPE in initializing seek of append-mode files. (GH-17136)

This change, which follows the behavior of C stdio's fdopen and Python 2's file object, allows pipes to be opened in append mode..
(cherry picked from commit 74fa9f723f700a342e582b5ad4b51a2c4801cd1c)

1 files changed, 11 insertions, 0 deletions

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index fc474c9..50459e0 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -3907,6 +3907,17 @@ class MiscIOTest(unittest.TestCase):
         f.close()
         g.close()
 
+    def test_open_pipe_with_append(self):
+        # bpo-27805: Ignore ESPIPE from lseek() in open().
+        r, w = os.pipe()
+        self.addCleanup(os.close, r)
+        f = self.open(w, 'a')
+        self.addCleanup(f.close)
+        # Check that the file is marked non-seekable. On Windows, however, lseek
+        # somehow succeeds on pipes.
+        if sys.platform != 'win32':
+            self.assertFalse(f.seekable())
+
     def test_io_after_close(self):
         for kwargs in [
                 {"mode": "w"},