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OK, that would seem to be easy enough to implement (well,
the handling of writeable buffers, not all the optional
hair).  I like this:

>>> buf = array.array('h', [0]*4)
[19139 refs]
>>> fcntl.ioctl(0, termios.TIOCGWINSZ, buf)
0
[19139 refs]
>>> buf
array('h', [47, 137, 841, 615])
[19139 refs]

I like this less:

>>> import array, fcntl
[19089 refs]
>>> buf = array.array('h', [0]*3)
[19093 refs]
>>> fcntl.ioctl(0, termios.TIOCGWINSZ, buf)
0
[19095 refs]
>>> del buf
Debug memory block at address p=0x401c3cb8:
    6 bytes originally requested
    The 4 pad bytes at p-4 are FORBIDDENBYTE, as expected.
    The 4 pad bytes at tail=0x401c3cbe are not all
FORBIDDENBYTE (0xfb):
        at tail+0: 0x67 *** OUCH
        at tail+1: 0x02 *** OUCH
        at tail+2: 0xfb
        at tail+3: 0xfb
    The block was made by call #16015 to debug malloc/realloc.
    Data at p: 2f 00 89 00 49 03
Fatal Python error: bad trailing pad byte
Aborted

I'm not sure what we can possibly do about this?  Copy into
a fixed buffer like we do today, then copy out again after
the ioctl?  Probably the best option.