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

Victor Stinner webhook-mailer at python.org
Mon Aug 3 20:40:14 EDT 2020

commit: 602a971a2af3a685d625c912c400cadd452718b1
branch: master
author: Victor Stinner <vstinner at python.org>
committer: GitHub <noreply at github.com>
date: 2020-08-04T02:40:10+02:00

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'').

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 c07fe3241c569..a6759b78bd801 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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