server/change.c

   1 /*
   2  * Server-side change notification management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <assert.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include "windef.h"
  26
  27 #include "handle.h"
  28 #include "thread.h"
  29 #include "request.h"
  30
  31 struct change
  32 {
  33     struct object  obj;      /* object header */
  34     int            subtree;  /* watch all the subtree */
  35     int            filter;   /* notification filter */
  36 };
  37
  38 static void change_dump( struct object *obj, int verbose );
  39 static int change_signaled( struct object *obj, struct thread *thread );
  40
  41 static const struct object_ops change_ops =
  42 {
  43     sizeof(struct change),    /* size */
  44     change_dump,              /* dump */
  45     add_queue,                /* add_queue */
  46     remove_queue,             /* remove_queue */
  47     change_signaled,          /* signaled */
  48     no_satisfied,             /* satisfied */
  49     no_get_fd,                /* get_fd */
  50     no_destroy                /* destroy */
  51 };
  52
  53
  54 static struct change *create_change_notification( int subtree, int filter )
  55 {
  56     struct change *change;
  57     if ((change = alloc_object( &change_ops )))
  58     {
  59         change->subtree = subtree;
  60         change->filter  = filter;
  61     }
  62     return change;
  63 }
  64
  65 static void change_dump( struct object *obj, int verbose )
  66 {
  67     struct change *change = (struct change *)obj;
  68     assert( obj->ops == &change_ops );
  69     fprintf( stderr, "Change notification sub=%d filter=%08x\n",
  70              change->subtree, change->filter );
  71 }
  72
  73 static int change_signaled( struct object *obj, struct thread *thread )
  74 {
  75 /*    struct change *change = (struct change *)obj;*/
  76     assert( obj->ops == &change_ops );
  77     return 0;  /* never signaled for now */
  78 }
  79
  80 /* create a change notification */
  81 DECL_HANDLER(create_change_notification)
  82 {
  83     struct change *change;
  84
  85     reply->handle = 0;
  86     if ((change = create_change_notification( req->subtree, req->filter )))
  87     {
  88         reply->handle = alloc_handle( current->process, change,
  89                                       STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE, 0 );
  90         release_object( change );
  91     }
  92 }