def readlines(self, sizehint=-1):
        '''This reads until EOF using readline() and returns a list containing
        the lines thus read. The optional 'sizehint' argument is ignored.
        Remember, because this reads until EOF that means the child
        process should have closed its stdout. If you run this method on
        a child that is still running with its stdout open then this
        method will block until it timesout.'''

        lines = []
        while True:
            line = self.readline()
            if not line:
                break
            lines.append(line)
        return lines