compiler-rt/test/asan/TestCases/Linux/mincore.cpp

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