5026 intra-node/inter-zone networking doesn't always deliver SIGPOLL

*** 20,29 ****
--- 20,32 ----
   */
  
  /*
   * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   */
+ /*
+  * Copyright 2014, OmniTI Computer Consulting, Inc. All rights reserved.
+  */
  
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/signal.h>
  #include <sys/cmn_err.h>
*** 394,404 ****
                   * XXX This unfortunately still generates
                   * a signal when a fd is closed but
                   * the proc is active.
                   */
                  mutex_enter(&pidlock);
!                 proc = prfind(so->so_pgrp);
                  if (proc == NULL) {
                          mutex_exit(&pidlock);
                          return;
                  }
                  mutex_enter(&proc->p_lock);
--- 397,412 ----
                   * XXX This unfortunately still generates
                   * a signal when a fd is closed but
                   * the proc is active.
                   */
                  mutex_enter(&pidlock);
!                 /*
!                  * Even if the thread started in another zone, we're receiving
!                  * on behalf of this socket's zone, so find the proc using the
!                  * socket's zone ID.
!                  */
!                 proc = prfind_zone(so->so_pgrp, so->so_zoneid);
                  if (proc == NULL) {
                          mutex_exit(&pidlock);
                          return;
                  }
                  mutex_enter(&proc->p_lock);
*** 411,421 ****
                   * calls to socket_sigproc().
                   */
                  pid_t pgrp = -so->so_pgrp;
  
                  mutex_enter(&pidlock);
!                 proc = pgfind(pgrp);
                  while (proc != NULL) {
                          mutex_enter(&proc->p_lock);
                          socket_sigproc(proc, event);
                          mutex_exit(&proc->p_lock);
                          proc = proc->p_pglink;
--- 419,434 ----
                   * calls to socket_sigproc().
                   */
                  pid_t pgrp = -so->so_pgrp;
  
                  mutex_enter(&pidlock);
!                 /*
!                  * Even if the thread started in another zone, we're receiving
!                  * on behalf of this socket's zone, so find the pgrp using the
!                  * socket's zone ID.
!                  */
!                 proc = pgfind_zone(pgrp, so->so_zoneid);
                  while (proc != NULL) {
                          mutex_enter(&proc->p_lock);
                          socket_sigproc(proc, event);
                          mutex_exit(&proc->p_lock);
                          proc = proc->p_pglink;