Serhiy Storchaka added the comment:

Third argument of ioctl should be not "    ", but a bytes object with platform 
dependent length sizeof(pid_t).

Beside this, the code at the top of the module checks the same condition and 
skip the tests if it is wrong. Race condition happened -- the process has been 
put into the background between executing these two codes. What command line 
you run the test?

----------
nosy: +serhiy.storchaka
status: pending -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14771>
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