resets this IO stream back to the last &mark
$handle - the handle to reset the mark for
$buffer = allocate(); writeb($buffer, "this.is.an.example"); closef($buffer); println("Read: " . readb($buffer, 4)); mark($buffer); println("Read: " . readb($buffer, 4)); reset($buffer); println("Read: " . readb($buffer, -1));
Read: this Read: .is. Read: .is.an.example