compiler-rt/test/msan/Linux/mincore.cpp

   1 // RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t
   2
   3 #include <assert.h>
   4 #include <unistd.h>
   5 #include <sys/mman.h>
   6 #include <sanitizer/msan_interface.h>
   7
   8 int main(void) {
   9   unsigned char vec[20];
  10   int res;
  11   size_t PS = sysconf(_SC_PAGESIZE);
  12   void *addr = mmap(nullptr, 20 * PS, PROT_READ | PROT_WRITE,
  13                     MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
  14
  15   __msan_poison(&vec, sizeof(vec));
  16   res = mincore(addr, 10 * PS, vec);
  17   assert(res == 0);
  18   assert(__msan_test_shadow(vec, sizeof(vec)) == 10);
  19
  20   __msan_poison(&vec, sizeof(vec));
  21   res = mincore(addr, 10 * PS + 42, vec);
  22   assert(res == 0);
  23   assert(__msan_test_shadow(vec, sizeof(vec)) == 11);
  24
  25   __msan_poison(&vec, sizeof(vec));
  26   res = mincore(addr, 10 * PS - 1, vec);
  27   assert(res == 0);
  28   assert(__msan_test_shadow(vec, sizeof(vec)) == 10);
  29
  30   __msan_poison(&vec, sizeof(vec));
  31   res = mincore(addr, 1, vec);
  32   assert(res == 0);
  33   assert(__msan_test_shadow(vec, sizeof(vec)) == 1);
  34
  35   return 0;
  36 }