1  void
       2  xnanosleep (_Bool overflow)
       3  {
       4    struct { int tv_nsec; } ts_sleep;
       5    if (0 <= ts_sleep.tv_nsec)
       6      overflow |= 1;
       7  
       8    for (;;)
       9      {
      10        if (overflow)
      11          ts_sleep.tv_nsec = 0;
      12        if (foo (ts_sleep))
      13          break;
      14      }
      15  }