Ensure sync SSL shutdown remaps error::eof as async_shutdown does.

include/boost/asio/ssl/detail/buffered_handshake_op.hpp

@@ -52,6 +52,10 @@ public:
         boost::asio::buffer_sequence_end(buffers_));
   }
 
+  void complete_sync(boost::system::error_code&) const
+  {
+  }
+
   template <typename Handler>
   void call_handler(Handler& handler,
       const boost::system::error_code& ec,

include/boost/asio/ssl/detail/handshake_op.hpp

@@ -47,6 +47,10 @@ public:
     return eng.handshake(type_, ec);
   }
 
+  void complete_sync(boost::system::error_code&) const
+  {
+  }
+
   template <typename Handler>
   void call_handler(Handler& handler,
       const boost::system::error_code& ec,

include/boost/asio/ssl/detail/io.hpp

@@ -79,18 +79,21 @@ std::size_t io(Stream& next_layer, stream_core& core,
 
     // Operation is complete. Return result to caller.
     core.engine_.map_error_code(ec);
+    op.complete_sync(ec);
     return bytes_transferred;
 
   default:
 
     // Operation is complete. Return result to caller.
     core.engine_.map_error_code(ec);
+    op.complete_sync(ec);
     return bytes_transferred;
 
   } while (!ec);
 
   // Operation failed. Return result to caller.
   core.engine_.map_error_code(ec);
+  op.complete_sync(ec);
   return 0;
 }
 

include/boost/asio/ssl/detail/read_op.hpp

@@ -52,6 +52,10 @@ public:
     return eng.read(buffer, ec, bytes_transferred);
   }
 
+  void complete_sync(boost::system::error_code&) const
+  {
+  }
+
   template <typename Handler>
   void call_handler(Handler& handler,
       const boost::system::error_code& ec,

include/boost/asio/ssl/detail/shutdown_op.hpp

@@ -42,6 +42,17 @@ public:
     return eng.shutdown(ec);
   }
 
+  void complete_sync(boost::system::error_code& ec) const
+  {
+    if (ec == boost::asio::error::eof)
+    {
+      // The engine only generates an eof when the shutdown notification has
+      // been received from the peer. This indicates that the shutdown has
+      // completed successfully, and thus need not be returned to the caller.
+      ec = boost::system::error_code();
+    }
+  }
+
   template <typename Handler>
   void call_handler(Handler& handler,
       const boost::system::error_code& ec,

include/boost/asio/ssl/detail/write_op.hpp

@@ -56,6 +56,10 @@ public:
     return eng.write(buffer, ec, bytes_transferred);
   }
 
+  void complete_sync(boost::system::error_code&) const
+  {
+  }
+
   template <typename Handler>
   void call_handler(Handler& handler,
       const boost::system::error_code& ec,