old-autovect-branch/libmudflap/testsuite/libmudflap.c/pass51-frag.c

   1 /* Test object-spanning accesses.  This is most conveniently done with
   2    mmap, thus the config.h specificity here.  */
   3 #include "../config.h"
   4
   5 #include <unistd.h>
   6 #include <string.h>
   7 #ifdef HAVE_SYS_MMAN_H
   8 #include <sys/mman.h>
   9 #endif
  10
  11 int main ()
  12 {
  13 #ifndef MAP_ANONYMOUS
  14 #define MAP_ANONYMOUS MAP_ANON
  15 #endif
  16 #ifdef HAVE_MMAP
  17   void *p;
  18   unsigned pg = getpagesize ();
  19   int rc;
  20
  21   p = mmap (NULL, 4 * pg, PROT_READ|PROT_WRITE,
  22             MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
  23   if (p == NULL)
  24     return 1;
  25
  26   memset (p, 0, 4*pg);
  27   rc = munmap (p, pg);
  28   if (rc < 0) return 1;
  29   memset (p+pg, 0, 3*pg);
  30   rc = munmap (p+pg, pg);
  31   if (rc < 0) return 1;
  32   memset (p+2*pg, 0, 2*pg);
  33   rc = munmap (p+2*pg, pg);
  34   if (rc < 0) return 1;
  35   memset (p+3*pg, 0, pg);
  36   rc = munmap (p+3*pg, pg);
  37   if (rc < 0) return 1;
  38 #endif
  39
  40   return 0;
  41 }