pintos-os.org Git - pintos-anon/blob - grading/vm/mmap-overlap.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #ifdef PINTOS
   4 #include <syscall.h>
   5 #else
   6 #include "posix-compat.h"
   7 #endif
   8 #include "sample.inc"
   9
  10 int
  11 main (void)
  12 {
  13   char *start = (char *) 0x10000000;
  14   size_t i;
  15   int fd[2];
  16
  17 #ifndef PINTOS
  18   printf ("Sorry, this test won't work on POSIX,\n"
  19           "because POSIX will accept overlapping mmaps.\n");
  20   abort ();
  21 #endif
  22
  23   printf ("(mmap-overlap) begin\n");
  24
  25   for (i = 0; i < 2; i++)
  26     {
  27       fd[i] = open ("zeros");
  28       if (fd[i] < 0)
  29         {
  30           printf ("(mmap-overlap) open() failed\n");
  31           return 1;
  32         }
  33       if (mmap (fd[i], start) == MAP_FAILED)
  34         {
  35           if (i == 1)
  36             return 0;
  37           else
  38             {
  39               printf ("(mmap-overlap) mmap() failed\n");
  40               return 1;
  41             }
  42         }
  43       start += 4096;
  44     }
  45
  46   printf ("(mmap-overlap) fail: mmap of overlapped blocks succeeded\n");
  47
  48   /* Done. */
  49   printf ("(mmap-overlap) end\n");
  50
  51   return 0;
  52 }