10052 "dladm show-ether" should pick one kstat snapshot and stick with it
Reviewed by: Rob Johnston <rob.johnston@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Gergo Doma <domag02@gmail.com>
Reviewed by: Andy Fiddaman <andy@omniosce.org>

*** 20,29 ****
--- 20,33 ----
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  
+ /*
+  * Copyright 2019 OmniOS Community Edition (OmniOSce) Association.
+  */
+ 
  #include <unistd.h>
  #include <errno.h>
  #include <ctype.h>
  #include <fcntl.h>
  #include <strings.h>
*** 119,128 ****
--- 123,133 ----
                  return (DLADM_STATUS_NOMEM);
          }
  
          (*handle)->dld_fd = dld_fd;
          (*handle)->door_fd = -1;
+         (*handle)->dld_kcp = NULL;
  
          return (DLADM_STATUS_OK);
  }
  
  void
*** 130,139 ****
--- 135,146 ----
  {
          if (handle != NULL) {
                  (void) close(handle->dld_fd);
                  if (handle->door_fd != -1)
                          (void) close(handle->door_fd);
+                 if (handle->dld_kcp != NULL)
+                         (void) kstat_close(handle->dld_kcp);
                  free(handle);
          }
  }
  
  int
*** 140,149 ****
--- 147,164 ----
  dladm_dld_fd(dladm_handle_t handle)
  {
          return (handle->dld_fd);
  }
  
+ kstat_ctl_t *
+ dladm_dld_kcp(dladm_handle_t handle)
+ {
+         if (handle->dld_kcp == NULL)
+                 handle->dld_kcp = kstat_open();
+         return (handle->dld_kcp);
+ }
+ 
  /*
   * If DLMGMT_DOOR hasn't been opened in the handle yet, open it.
   */
  dladm_status_t
  dladm_door_fd(dladm_handle_t handle, int *door_fd)