bpo-30329: Catch Windows error 10022 on shutdown() (#1538) (#1621)

vstinner · web-flow · commit c9ba45d1b71d · 2017-05-16T16:02:35.000-07:00
Catch the Windows socket WSAEINVAL error (code 10022) in imaplib and poplib on shutdown(SHUT_RDWR): An invalid operation was attempted This error occurs sometimes on SSL connections. (cherry picked from commit 83a2c28)
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
@@ -310,9 +310,12 @@ def shutdown(self):
         self.file.close()
         try:
             self.sock.shutdown(socket.SHUT_RDWR)
-        except OSError as e:
-            # The server might already have closed the connection
-            if e.errno != errno.ENOTCONN:
+        except OSError as exc:
+            # The server might already have closed the connection.
+            # On Windows, this may result in WSAEINVAL (error 10022):
+            # An invalid operation was attempted.
+            if (exc.errno != errno.ENOTCONN
+               and getattr(exc, 'winerror', 0) != 10022):
                 raise
         finally:
             self.sock.close()
diff --git a/Lib/poplib.py b/Lib/poplib.py
@@ -288,9 +288,12 @@ def close(self):
             if sock is not None:
                 try:
                     sock.shutdown(socket.SHUT_RDWR)
-                except OSError as e:
-                    # The server might already have closed the connection
-                    if e.errno != errno.ENOTCONN:
+                except OSError as exc:
+                    # The server might already have closed the connection.
+                    # On Windows, this may result in WSAEINVAL (error 10022):
+                    # An invalid operation was attempted.
+                    if (exc.errno != errno.ENOTCONN
+                       and getattr(exc, 'winerror', 0) != 10022):
                         raise
                 finally:
                     sock.close()
diff --git a/Misc/NEWS b/Misc/NEWS
@@ -49,6 +49,10 @@ Extension Modules
 Library
 -------
 
+- bpo-30329: imaplib and poplib now catch the Windows socket WSAEINVAL error
+  (code 10022) on shutdown(SHUT_RDWR): An invalid operation was attempted.
+  This error occurs sometimes on SSL connections.
+
 - bpo-30375: Warnings emitted when compile a regular expression now always
   point to the line in the user code.  Previously they could point into inners
   of the re module if emitted from inside of groups or conditionals.
