text: //
  // Copyright (c) Microsoft. All rights reserved.
  // Licensed under the MIT license. See LICENSE file in the project root for full license information. 
  //
  
  /*============================================================
  **
  ** Source: test2.c
  **
  ** Purpose: 
  ** Create three consecuative pages, NOACCES, READWRITE and
  ** NOACCESS.  Check to ensure that the READWRITE page returns 0, to 
  ** ensure that IsBadWritePtr isn't overflowing.  Also check the other two
  ** pages to see that they return non-zero.
  **
  **
  **=========================================================*/
  
  #include <palsuite.h>
  #define PAGE_SIZE 4096
  
  int __cdecl main(int argc, char *argv[]) {
      
      LPVOID PageOne, PageTwo, PageThree;
  
      if(0 != (PAL_Initialize(argc, argv)))
      {
  	return FAIL;
      }
      
      /* Reserve enough space for four pages.  We'll commit this memory
         and set the correct access for each page below.
      */
      
      PageOne = VirtualAlloc(NULL, 
  			   PAGE_SIZE*4, 
  			   MEM_RESERVE, 
  			   PAGE_NOACCESS);
  
      if(PageOne == NULL)
      {
  	Fail("ERROR: VirtualAlloc failed to reserve the required memory.\n");
      }
  
      /* Set the first Page to PAGE_NOACCESS */
      
      PageOne = VirtualAlloc(PageOne,
  			   PAGE_SIZE,
  			   MEM_COMMIT,
  			   PAGE_NOACCESS);
  
      if(PageOne == NULL)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: VirtualAlloc failed to commit the required memory "
  	     "for the first page.\n");
      }
  
      /* Set the second Page to PAGE_READWRITE */
  
      PageTwo = VirtualAlloc(((BYTE*)PageOne)+PAGE_SIZE,
  			   PAGE_SIZE,
  			   MEM_COMMIT,
  			   PAGE_READWRITE);
      if(PageTwo == NULL)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: VirtualAlloc failed to allocate the required memory "
  	     "for the second page. %d\n",GetLastError());
      }
      
      /* Set the third Page to PAGE_NOACCESS */
  
      PageThree = VirtualAlloc(((BYTE*)PageTwo) + (2 * PAGE_SIZE),
  			     PAGE_SIZE,
  			     MEM_COMMIT,
  			     PAGE_NOACCESS);
        
      if(PageThree == NULL)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: VirtualAlloc failed to allocate the required memory. "
  	     "For the third page.\n");
      }
      
      
  /* Check that calling IsBadWritePtr on the first page returns non-zero */
      
      if(IsBadWritePtr(PageThree,PAGE_SIZE) == 0)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: Called IsBadWritePtr on a page which was set NOACCESS "
  	     "but the return value was 0, indicating that the memory is "
  	     "writable.\n");
      }
  
      /* Check that calling IsBadWritePtr on the middle page returns 0 */
  
      if(IsBadWritePtr(PageTwo,PAGE_SIZE) != 0)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: IsBadWritePtr didn't return 0 when called on a "
  	     "page which should have been writable.\n");
      }
  
      /* Check that calling IsBadWritePtr on the third page returns non-zero */
      
      if(IsBadWritePtr(PageThree,PAGE_SIZE) == 0)
      {
  	VirtualFree(PageOne,0,MEM_RELEASE);
  
  	Fail("ERROR: Called IsBadWritePtr on a page which was set NOACCESS "
  	     "but the return value was 0, indicating that the memory is "
  	     "writable.\n");
      }
      VirtualFree(PageOne,0,MEM_RELEASE);
      PAL_Terminate();
      return PASS;
  }
  
  
  
  
  
  