Question

I have a particular hardware driver which requires me to call _write(fd, 0, 0) on its file descriptor in order to trigger some particular behaviour.

I’d like to be able to do this from Python – please can anyone suggest a way of achieving this?

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EDIT (should’ve put this in at the beginning, sorry!):

Things that have been tried and don’t work:

f.write("")
os.write(fd, "")
os.fdsync(fd)

Answer 1

If you really need to have a null pointer (what a terrible driver design – a ioctl would have been by far better), you’ll have to go via ctypes.

At least,

import ctypes
ctypes.cdll.msvcrt._write(1, 0, 0)

seems to work.