[Python-checkins] bpo-41467: Fix asyncio recv_into() on Windows (GH-21720)

Miss Islington (bot) webhook-mailer at python.org
Mon Aug 3 20:58:10 EDT 2020

commit: b934d832d1e16bf235c536dcde3006faf29757fc
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2020-08-03T17:58:06-07:00

bpo-41467: Fix asyncio recv_into() on Windows (GH-21720)

On Windows, fix asyncio recv_into() return value when the socket/pipe
is closed (BrokenPipeError): return 0 rather than an empty byte
string (b'').
(cherry picked from commit 602a971a2af3a685d625c912c400cadd452718b1)

Co-authored-by: Victor Stinner <vstinner at python.org>

A Misc/NEWS.d/next/Library/2020-08-04-00-20-30.bpo-41467.Z8DgTL.rst
M Lib/asyncio/windows_events.py

diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index ac51109ff1a83..12e87abfbf2ea 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -469,7 +469,7 @@ def recv_into(self, conn, buf, flags=0):
                 ov.ReadFileInto(conn.fileno(), buf)
         except BrokenPipeError:
-            return self._result(b'')
+            return self._result(0)
         def finish_recv(trans, key, ov):
diff --git a/Misc/NEWS.d/next/Library/2020-08-04-00-20-30.bpo-41467.Z8DgTL.rst b/Misc/NEWS.d/next/Library/2020-08-04-00-20-30.bpo-41467.Z8DgTL.rst
new file mode 100644
index 0000000000000..f12693e117631
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-08-04-00-20-30.bpo-41467.Z8DgTL.rst
@@ -0,0 +1,3 @@
+On Windows, fix asyncio ``recv_into()`` return value when the socket/pipe is
+closed (:exc:`BrokenPipeError`): return ``0`` rather than an empty byte
+string (``b''``).

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