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 #include "winuser.h"
  33
  34 struct clipboard
  35 {
  36     struct object  obj;              /* object header */
  37     struct thread *open_thread;      /* thread id that has clipboard open */
  38     user_handle_t  open_win;         /* window that has clipboard open */
  39     struct thread *owner_thread;     /* thread id that owns the clipboard */
  40     user_handle_t  owner_win;        /* window that owns the clipboard data */
  41     user_handle_t  viewer;           /* first window in clipboard viewer list */
  42     unsigned int   seqno;            /* clipboard change sequence number */
  43     time_t         seqno_timestamp;  /* time stamp of last seqno increment */
  44 };
  45
  46 static void clipboard_dump( struct object *obj, int verbose );
  47
  48 static const struct object_ops clipboard_ops =
  49 {
  50     sizeof(struct clipboard),     /* size */
  51     clipboard_dump,               /* dump */
  52     no_add_queue,                 /* add_queue */
  53     NULL,                         /* remove_queue */
  54     NULL,                         /* signaled */
  55     NULL,                         /* satisfied */
  56     no_signal,                    /* signal */
  57     no_get_fd,                    /* get_fd */
  58     no_close_handle,              /* close_handle */
  59     no_destroy                    /* destroy */
  60 };
  61
  62
  63 #define MINUPDATELAPSE 2
  64
  65 /* dump a clipboard object */
  66 static void clipboard_dump( struct object *obj, int verbose )
  67 {
  68     struct clipboard *clipboard = (struct clipboard *)obj;
  69
  70     fprintf( stderr, "Clipboard open_thread=%p open_win=%p owner_thread=%p owner_win=%p viewer=%p seq=%u\n",
  71              clipboard->open_thread, clipboard->open_win, clipboard->owner_thread,
  72              clipboard->owner_win, clipboard->viewer, clipboard->seqno );
  73 }
  74
  75 /* retrieve the clipboard info for the current process, allocating it if needed */
  76 static struct clipboard *get_process_clipboard(void)
  77 {
  78     struct clipboard *clipboard;
  79     struct winstation *winstation = get_process_winstation( current->process, WINSTA_ACCESSCLIPBOARD );
  80
  81     if (!winstation) return NULL;
  82
  83     if (!(clipboard = winstation->clipboard))
  84     {
  85         if ((clipboard = alloc_object( &clipboard_ops )))
  86         {
  87             clipboard->open_thread = NULL;
  88             clipboard->open_win = 0;
  89             clipboard->owner_thread = NULL;
  90             clipboard->owner_win = 0;
  91             clipboard->viewer = 0;
  92             clipboard->seqno = 0;
  93             clipboard->seqno_timestamp = 0;
  94             winstation->clipboard = clipboard;
  95         }
  96     }
  97     release_object( winstation );
  98     return clipboard;
  99 }
 100
 101
 102 /* Called when thread terminates to allow release of clipboard */
 103 void cleanup_clipboard_thread(struct thread *thread)
 104 {
 105     struct clipboard *clipboard;
 106     struct winstation *winstation = get_process_winstation( thread->process, WINSTA_ACCESSCLIPBOARD );
 107
 108     if (!winstation) return;
 109
 110     if ((clipboard = winstation->clipboard))
 111     {
 112         if (thread == clipboard->open_thread)
 113         {
 114             clipboard->open_win = 0;
 115             clipboard->open_thread = NULL;
 116         }
 117         if (thread == clipboard->owner_thread)
 118         {
 119             clipboard->owner_win = 0;
 120             clipboard->owner_thread = NULL;
 121         }
 122     }
 123     release_object( winstation );
 124 }
 125
 126 static int set_clipboard_window( struct clipboard *clipboard, user_handle_t win, int clear )
 127 {
 128     if (clipboard->open_thread && clipboard->open_thread != current)
 129     {
 130         set_error(STATUS_WAS_LOCKED);
 131         return 0;
 132     }
 133     else if (!clear)
 134     {
 135         clipboard->open_win = win;
 136         clipboard->open_thread = current;
 137     }
 138     else
 139     {
 140         clipboard->open_thread = NULL;
 141         clipboard->open_win = 0;
 142     }
 143     return 1;
 144 }
 145
 146
 147 static int set_clipboard_owner( struct clipboard *clipboard, user_handle_t win, int clear )
 148 {
 149     if (clipboard->open_thread && clipboard->open_thread->process != current->process)
 150     {
 151         set_error(STATUS_WAS_LOCKED);
 152         return 0;
 153     }
 154     else if (!clear)
 155     {
 156         clipboard->owner_win = win;
 157         clipboard->owner_thread = current;
 158     }
 159     else
 160     {
 161         clipboard->owner_win = 0;
 162         clipboard->owner_thread = NULL;
 163     }
 164     return 1;
 165 }
 166
 167
 168 static int get_seqno( struct clipboard *clipboard )
 169 {
 170     time_t tm = time(NULL);
 171
 172     if (!clipboard->owner_thread && (tm > (clipboard->seqno_timestamp + MINUPDATELAPSE)))
 173     {
 174         clipboard->seqno_timestamp = tm;
 175         clipboard->seqno++;
 176     }
 177     return clipboard->seqno;
 178 }
 179
 180
 181 DECL_HANDLER(set_clipboard_info)
 182 {
 183     struct clipboard *clipboard = get_process_clipboard();
 184
 185     if (!clipboard) return;
 186
 187     reply->old_clipboard = clipboard->open_win;
 188     reply->old_owner     = clipboard->owner_win;
 189     reply->old_viewer    = clipboard->viewer;
 190
 191     if (req->flags & SET_CB_OPEN)
 192     {
 193         if (clipboard->open_thread)
 194         {
 195             /* clipboard already opened */
 196             set_error(STATUS_WAS_LOCKED);
 197             return;
 198         }
 199
 200         if (!set_clipboard_window( clipboard, req->clipboard, 0 )) return;
 201     }
 202     else if (req->flags & SET_CB_CLOSE)
 203     {
 204         if (clipboard->open_thread != current)
 205         {
 206             set_win32_error(ERROR_CLIPBOARD_NOT_OPEN);
 207             return;
 208         }
 209
 210         if (!set_clipboard_window( clipboard, 0, 1 )) return;
 211     }
 212
 213     if (req->flags & SET_CB_OWNER)
 214     {
 215         if (!set_clipboard_owner( clipboard, req->owner, 0 )) return;
 216     }
 217     else if (req->flags & SET_CB_RELOWNER)
 218     {
 219         if (!set_clipboard_owner( clipboard, 0, 1 )) return;
 220     }
 221
 222     if (req->flags & SET_CB_VIEWER) clipboard->viewer = req->viewer;
 223
 224     if (req->flags & SET_CB_SEQNO) clipboard->seqno++;
 225
 226     reply->seqno = get_seqno( clipboard );
 227
 228     if (clipboard->open_thread == current) reply->flags |= CB_OPEN;
 229     if (clipboard->owner_thread == current) reply->flags |= CB_OWNER;
 230     if (clipboard->owner_thread && clipboard->owner_thread->process == current->process)
 231         reply->flags |= CB_PROCESS;
 232 }