Apply read_write_timeout to Unix socket connections.

src/Connection/StreamConnection.php

@@ -123,6 +123,14 @@ class StreamConnection extends AbstractConnection
             $this->onConnectionError(trim($errstr), $errno);
         }
 
+        if (isset($parameters->read_write_timeout)) {
+            $rwtimeout = (float) $parameters->read_write_timeout;
+            $rwtimeout = $rwtimeout > 0 ? $rwtimeout : -1;
+            $timeoutSeconds  = floor($rwtimeout);
+            $timeoutUSeconds = ($rwtimeout - $timeoutSeconds) * 1000000;
+            stream_set_timeout($resource, $timeoutSeconds, $timeoutUSeconds);
+        }
+
         return $resource;
     }