server/clipboard.c

   1 /*
   2  * Server-side clipboard management
   3  *
   4  * Copyright (C) 2002 Ulrich Czekalla
   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 "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "request.h"
  30 #include "object.h"
  31 #include "user.h"
  32
  33 static struct thread *cbthread; /* thread id that has clipboard open */
  34 static user_handle_t clipboard; /* window that has clipboard open */
  35
  36 static struct thread *cbowner;  /* thread id that owns the clipboard */
  37 static user_handle_t owner;     /* window that owns the clipboard data */
  38
  39 static user_handle_t viewer;    /* first window in clipboard viewer list */
  40 static unsigned int seqno;      /* clipboard change sequence number */
  41 static time_t seqnots;          /* time stamp of last seqno increment */
  42
  43 #define MINUPDATELAPSE 2
  44
  45 /* Called when thread terminates to allow release of clipboard */
  46 void cleanup_clipboard_thread(struct thread *thread)
  47 {
  48     if (thread == cbthread)
  49     {
  50         clipboard = 0;
  51         cbthread = NULL;
  52     }
  53     if (thread == cbowner)
  54     {
  55         owner = 0;
  56         cbowner = NULL;
  57     }
  58 }
  59
  60 static int set_clipboard_window(user_handle_t win, int clear)
  61 {
  62     if (cbthread && cbthread != current)
  63     {
  64         set_error(STATUS_WAS_LOCKED);
  65         return 0;
  66     }
  67     else if (!clear)
  68     {
  69         clipboard = win;
  70         cbthread = current;
  71     }
  72     else
  73     {
  74         cbthread = NULL;
  75         clipboard = 0;
  76     }
  77     return 1;
  78 }
  79
  80
  81 static int set_clipboard_owner(user_handle_t win, int clear)
  82 {
  83     if (cbowner && cbowner != current)
  84     {
  85         set_error(STATUS_WAS_LOCKED);
  86         return 0;
  87     }
  88     else if (!clear)
  89     {
  90         owner = win;
  91         cbowner = current;
  92     }
  93     else
  94     {
  95         owner = 0;
  96         cbowner = NULL;
  97     }
  98     return 1;
  99 }
 100
 101
 102 static int get_seqno(void)
 103 {
 104     time_t tm = time(NULL);
 105
 106     if (!cbowner && (tm > (seqnots + MINUPDATELAPSE)))
 107     {
 108         seqnots = tm;
 109         seqno++;
 110     }
 111     return seqno;
 112 }
 113
 114
 115 DECL_HANDLER(set_clipboard_info)
 116 {
 117     reply->old_clipboard = clipboard;
 118     reply->old_owner = owner;
 119     reply->old_viewer = viewer;
 120
 121     if (req->flags & SET_CB_OPEN)
 122     {
 123         if (cbthread)
 124         {
 125             /* clipboard already opened */
 126             set_error(STATUS_WAS_LOCKED);
 127             return;
 128         }
 129
 130         if (!set_clipboard_window(req->clipboard, 0))
 131             return;
 132     }
 133     else if (req->flags & SET_CB_CLOSE)
 134     {
 135         if (cbthread != current)
 136         {
 137             set_win32_error(ERROR_CLIPBOARD_NOT_OPEN);
 138             return;
 139         }
 140
 141         if (!set_clipboard_window(0, 1))
 142             return;
 143     }
 144
 145     if (req->flags & SET_CB_OWNER)
 146     {
 147         if (!set_clipboard_owner(req->owner, 0))
 148             return;
 149     }
 150     else if (req->flags & SET_CB_RELOWNER)
 151     {
 152         if (!set_clipboard_owner(0, 1))
 153             return;
 154     }
 155
 156     if (req->flags & SET_CB_VIEWER)
 157         viewer = req->viewer;
 158
 159     if (req->flags & SET_CB_SEQNO)
 160         seqno++;
 161
 162     reply->seqno = get_seqno();
 163
 164     if (cbthread == current)
 165         reply->flags |= CB_OPEN;
 166
 167     if (cbowner == current)
 168         reply->flags |= CB_OWNER;
 169 }