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 }
37