IABSD.fr/xenocara/xserver/glx/swap_interval.c

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• Author : matthieu
  Date : 2014-12-09 17:58:52
  Hash : 797ed933
  Message : Protocol handling issues in X Window System servers One year after Ilja van Sprundel, discovered and reported a large number of issues in the way the X server code base handles requests from X clients, they have been fixed.

• xserver/glx/swap_interval.c

• /*
   * (C) Copyright IBM Corporation 2006
   * All Rights Reserved.
   *
   * 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
   * on the rights to use, copy, modify, merge, publish, distribute, sub
   * license, 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 (including the next
   * paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
   * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS 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.
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include "glxserver.h"
  #include "glxutil.h"
  #include "glxext.h"
  #include "singlesize.h"
  #include "unpack.h"
  #include "indirect_size_get.h"
  #include "indirect_dispatch.h"
  #include "glxbyteorder.h"
  
  static int DoSwapInterval(__GLXclientState * cl, GLbyte * pc, int do_swap);
  
  int
  DoSwapInterval(__GLXclientState * cl, GLbyte * pc, int do_swap)
  {
      xGLXVendorPrivateReq *const req = (xGLXVendorPrivateReq *) pc;
      ClientPtr client = cl->client;
      const GLXContextTag tag = req->contextTag;
      __GLXcontext *cx;
      GLint interval;
  
      REQUEST_FIXED_SIZE(xGLXVendorPrivateReq, 4);
  
      cx = __glXLookupContextByTag(cl, tag);
  
      if ((cx == NULL) || (cx->pGlxScreen == NULL)) {
          client->errorValue = tag;
          return __glXError(GLXBadContext);
      }
  
      if (cx->pGlxScreen->swapInterval == NULL) {
          LogMessage(X_ERROR, "AIGLX: cx->pGlxScreen->swapInterval == NULL\n");
          client->errorValue = tag;
          return __glXError(GLXUnsupportedPrivateRequest);
      }
  
      if (cx->drawPriv == NULL) {
          client->errorValue = tag;
          return BadValue;
      }
  
      pc += __GLX_VENDPRIV_HDR_SIZE;
      interval = (do_swap)
          ? bswap_32(*(int *) (pc + 0))
          : *(int *) (pc + 0);
  
      if (interval <= 0)
          return BadValue;
  
      (void) (*cx->pGlxScreen->swapInterval) (cx->drawPriv, interval);
      return Success;
  }
  
  int
  __glXDisp_SwapIntervalSGI(__GLXclientState * cl, GLbyte * pc)
  {
      return DoSwapInterval(cl, pc, 0);
  }
  
  int
  __glXDispSwap_SwapIntervalSGI(__GLXclientState * cl, GLbyte * pc)
  {
      return DoSwapInterval(cl, pc, 1);
  }