We should retry shutdown on EINPROGRESS error. Fixes #3168. (#4433)

akzhan · ysbaddaden · commit 503fc04b6429 · 2017-05-21T19:18:29.000+02:00
Just like EAGAIN handling behavior but due to another reason.
diff --git a/src/openssl/ssl/socket.cr b/src/openssl/ssl/socket.cr
@@ -145,7 +145,9 @@ abstract class OpenSSL::SSL::Socket
             # assume we're done
             break
           when Errno::EAGAIN
-            # Ignore, shutdown did not complete yet
+            # Ignore/retry, shutdown did not complete yet
+          when Errno::EINPROGRESS
+            # Ignore/retry, another operation not complete yet
           else
             raise e
           end
