Ned Deily <n...@acm.org> added the comment:

If you call ioctl with the mutate_flag True, you need to pass "an object 
supporting the read-write buffer protocol" as the arg parameter for the results 
of ioctl to be returned in.  In your example, you pass a bytes object which is 
immutable.  Try using a bytearray object instead, which is mutable, or, for 
instance, an array object as shown in the documentation.

http://docs.python.org/py3k/library/fcntl.html#fcntl.ioctl

http://docs.python.org/py3k/library/stdtypes.html#bytes-and-byte-array-methods

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10345>
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