Method getErrorMsg

src/modules/keyboard_state.cpp:28–44

 private:
  static auto getErrorMsg(int err, const char* msg) -> std::string {
    std::string error_msg{msg};
    error_msg += ": ";

#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 32)
    // strerrorname_np gets the error code's name; it's nice to have, but it's a recent GNU
    // extension
    const auto errno_name = strerrorname_np(err);
    error_msg += errno_name;
    error_msg += " ";
#endif

    const auto errno_str = strerror(err);
    error_msg += errno_str;

    return error_msg;
  }
};

auto openFile(const std::string& path, int flags) -> int {