runtime/platform/mmap-protect.c

   1 void *GC_mmapAnon_safe_protect (void *start, size_t length, int prot,
   2                                 size_t dead_low, size_t dead_high) {
   3         void *base,*low,*result,*high;
   4
   5         base = GC_mmapAnon_safe (start, length + dead_low + dead_high);
   6         low = base;
   7         if (mprotect (low, dead_low, PROT_NONE))
   8                 diee ("mprotect failed");
   9         result = (void*)((pointer)low + dead_low);
  10         if (mprotect (result, length, prot))
  11                 diee ("mprotect failed");
  12         high = (void*)((pointer)result + length);
  13         if (mprotect (high, dead_high, PROT_NONE))
  14                 diee ("mprotect failed");
  15         return result;
  16 }