public static extern int settimeofday (ref Timeval tv, ref Timezone tz);
private static extern int gettimeofday (IntPtr ignore, out Timezone tz);
public static int gettimeofday (out Timezone tz) { return gettimeofday (IntPtr.Zero, out tz); }
public static extern int gettimeofday (out Timeval tv, out Timezone tz);