IABSD.fr/xenocara/xserver/hw/xwin/winclipboardwrappers.c

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• Author : matthieu
  Date : 2015-09-16 19:10:19
  Hash : 86ea9f12
  Message : Update to xserver 1.17.2. tested by dcoppa@, jsg@, jasper@ & naddy@

• xserver/hw/xwin/winclipboardwrappers.c

• /*
   *Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
   *Copyright (C) Colin Harrison 2005-2008
   *
   *Permission is hereby granted, free of charge, to any person obtaining
   * a copy of this software and associated documentation files (the
   *"Software"), to deal in the Software without restriction, including
   *without limitation the rights to use, copy, modify, merge, publish,
   *distribute, sublicense, and/or sell copies of the Software, and to
   *permit persons to whom the Software is furnished to do so, subject to
   *the following conditions:
   *
   *The above copyright notice and this permission notice shall be
   *included in all copies or substantial portions of the Software.
   *
   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
   *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
   *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   *Except as contained in this notice, the name of the copyright holder(s)
   *and author(s) shall not be used in advertising or otherwise to promote
   *the sale, use or other dealings in this Software without prior written
   *authorization from the copyright holder(s) and author(s).
   *
   * Authors:	Harold L Hunt II
   *              Colin Harrison
   */
  
  #ifdef HAVE_XWIN_CONFIG_H
  #include <xwin-config.h>
  #endif
  
  #include "win.h"
  #include "dixstruct.h"
  
  /*
   * Local function prototypes
   */
  
  DISPATCH_PROC(winProcEstablishConnection);
  
  /*
   * Wrapper for internal EstablishConnection function.
   * Initializes internal clients that must not be started until
   * an external client has connected.
   */
  
  int
  winProcEstablishConnection(ClientPtr client)
  {
      int iReturn;
      static int s_iCallCount = 0;
      static unsigned long s_ulServerGeneration = 0;
  
      if (s_iCallCount == 0)
          winDebug("winProcEstablishConnection - Hello\n");
  
      /* Do nothing if clipboard is not enabled */
      if (!g_fClipboard) {
          ErrorF("winProcEstablishConnection - Clipboard is not enabled, "
                 "returning.\n");
  
          /* Unwrap the original function, call it, and return */
          InitialVector[2] = winProcEstablishConnectionOrig;
          iReturn = (*winProcEstablishConnectionOrig) (client);
          winProcEstablishConnectionOrig = NULL;
          return iReturn;
      }
  
      /* Watch for server reset */
      if (s_ulServerGeneration != serverGeneration) {
          /* Save new generation number */
          s_ulServerGeneration = serverGeneration;
  
          /* Reset call count */
          s_iCallCount = 0;
      }
  
      /* Increment call count */
      ++s_iCallCount;
  
      /*
       * This procedure is only used for initialization.
       * We can unwrap the original procedure at this point
       * so that this function is no longer called until the
       * server resets and the function is wrapped again.
       */
      InitialVector[2] = winProcEstablishConnectionOrig;
  
      /*
       * Call original function and bail if it fails.
       * NOTE: We must do this first, since we need XdmcpOpenDisplay
       * to be called before we initialize our clipboard client.
       */
      iReturn = (*winProcEstablishConnectionOrig) (client);
      if (iReturn != 0) {
          ErrorF("winProcEstablishConnection - ProcEstablishConnection "
                 "failed, bailing.\n");
          return iReturn;
      }
  
      /* Clear original function pointer */
      winProcEstablishConnectionOrig = NULL;
  
      /* Startup the clipboard client if clipboard mode is being used */
      if (g_fClipboard) {
          /*
           * NOTE: The clipboard client is started here for a reason:
           * 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
           * 2) If the clipboard client attaches during X Server startup,
           *    then it becomes the "magic client" that causes the X Server
           *    to reset if it exits.
           * 3) XDMCP calls KillAllClients when it starts up.
           * 4) The clipboard client is a client, so it is killed.
           * 5) The clipboard client is the "magic client", so the X Server
           *    resets itself.
           * 6) This repeats ad infinitum.
           * 7) We avoid this by waiting until at least one client (could
           *    be XDM, could be another client) connects, which makes it
           *    almost certain that the clipboard client will not connect
           *    until after XDM when using XDMCP.
           */
  
          /* Create the clipboard client thread */
          if (!winInitClipboard()) {
              ErrorF("winProcEstablishConnection - winClipboardInit "
                     "failed.\n");
              return iReturn;
          }
  
          ErrorF("winProcEstablishConnection - winInitClipboard returned.\n");
      }
  
      return iReturn;
  }