8634 epoll fails to wake on certain edge-triggered conditions
8635 epoll should not emit POLLNVAL
8636 recursive epoll should emit EPOLLRDNORM
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>

*** 19,29 ****
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
!  * Copyright (c) 2015, Joyent, Inc.
   */
  
  /*
   * This file implements the interfaces that the /dev/random
   * driver uses for read(2), write(2) and poll(2) on /dev/random or
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
!  * Copyright 2017 Joyent, Inc.
   */
  
  /*
   * This file implements the interfaces that the /dev/random
   * driver uses for read(2), write(2) and poll(2) on /dev/random or
*** 920,930 ****
                   */
                  if (rnbyte_cnt >= MINEXTRACTBYTES)
                          *reventsp |= (events & (POLLIN | POLLRDNORM));
          }
  
!         if (*reventsp == 0 && !anyyet)
                  *phpp = &rnd_pollhead;
  }
  
  /*ARGSUSED*/
  static void
--- 920,930 ----
                   */
                  if (rnbyte_cnt >= MINEXTRACTBYTES)
                          *reventsp |= (events & (POLLIN | POLLRDNORM));
          }
  
!         if ((*reventsp == 0 && !anyyet) || (events & POLLET))
                  *phpp = &rnd_pollhead;
  }
  
  /*ARGSUSED*/
  static void