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     NULL,                     /* get_poll_events */
  50     NULL,                     /* poll_event */
  51     no_get_fd,                /* get_fd */
  52     no_flush,                 /* flush */
  53     no_get_file_info,         /* get_file_info */
  54     NULL,                     /* queue_async */
  55     no_destroy                /* destroy */
  56 };
  57
  58
  59 static struct change *create_change_notification( int subtree, int filter )
  60 {
  61     struct change *change;
  62     if ((change = alloc_object( &change_ops, -1 )))
  63     {
  64         change->subtree = subtree;
  65         change->filter  = filter;
  66     }
  67     return change;
  68 }
  69
  70 static void change_dump( struct object *obj, int verbose )
  71 {
  72     struct change *change = (struct change *)obj;
  73     assert( obj->ops == &change_ops );
  74     fprintf( stderr, "Change notification sub=%d filter=%08x\n",
  75              change->subtree, change->filter );
  76 }
  77
  78 static int change_signaled( struct object *obj, struct thread *thread )
  79 {
  80 /*    struct change *change = (struct change *)obj;*/
  81     assert( obj->ops == &change_ops );
  82     return 0;  /* never signaled for now */
  83 }
  84
  85 /* create a change notification */
  86 DECL_HANDLER(create_change_notification)
  87 {
  88     struct change *change;
  89
  90     reply->handle = 0;
  91     if ((change = create_change_notification( req->subtree, req->filter )))
  92     {
  93         reply->handle = alloc_handle( current->process, change,
  94                                       STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE, 0 );
  95         release_object( change );
  96     }
  97 }