main.cpp

#include <iostream>
#include <fcntl.h>

int main()
{
  mode_t perms = S_IRWXU;
  int fd = open("log", O_CREAT | O_EXCL, perms);
  if (fd >= 0) {
    std::cout << "[OK] CreateFileA\n";
  } else {
    std::cout << "[FAIL] CreateFileA\n";
  }
  return 0;
}