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'').
diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index c07fe32..a6759b7 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -469,7 +469,7 @@
else:
ov.ReadFileInto(conn.fileno(), buf)
except BrokenPipeError:
- return self._result(b'')
+ return self._result(0)
def finish_recv(trans, key, ov):
try:
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 0000000..f12693e
--- /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''``).