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d d � Z d d � Z e e d d � Z e e d d � Z d S)zPseudo terminal utilities.� )�selectN�openpty�fork�spawn� � c C sN y t j � SWn t t f k
r( Yn Xt � \ } } t | � } | | f S)zdopenpty() -> (master_fd, slave_fd)
Open a pty master/slave pair, using os.openpty() if possible.)�osr �AttributeError�OSError�_open_terminal�
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Open a pty master and return the fd, and the filename of the slave end.
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rX w Yn X| d | | f SWq Wt d � � d S)z1Open pty master and return (master_fd, tty_name).ZpqrstuvwxyzPQRSTZ0123456789abcdefz/dev/ptyz/dev/ttyzout of pty devicesN)r �open�O_RDWRr
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Open the pty slave and acquire the controlling terminal, returning
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