src/java.base/share/classes/sun/nio/ch/PollerProvider.java

*** 87,6 ***
--- 87,22 ---
      /**
       * Creates a Poller for POLLOUT polling.
       * @param subPoller true to create a sub-poller
       */
      abstract Poller writePoller(boolean subPoller) throws IOException;
+ 
+     /**
+      * Returns true if read pollers support read ops in addition to POLLIN polling.
+      * @implSpec The default implementation returns false.
+      */
+     boolean supportReadOps() {
+         return false;
+     }
+ 
+     /**
+      * Returns true if write pollers support write ops in addition to POLLOUT polling.
+      * @implSpec The default implementation returns false.
+      */
+     boolean supportWriteOps() {
+         return false;
+     }
  }