Martin Panter added the comment:
It looks like some of these do make the file descriptor accessible to the
Python user. The following are from the RST documentation:
oss_audio_device.fileno()
oss_mixer_device.fileno()
epoll.fileno()
kqueue.fileno()
audio device.fileno()
I did not find any documentation for the “linuxaudiodev” module, but it also
seems to supply a public fileno() method:
$ sudo modprobe snd-pcm-oss
$ python2
Python 2.7.11 (default, Dec 6 2015, 15:43:46)
[GCC 5.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import linuxaudiodev
>>> a = linuxaudiodev.open("w")
>>> a.fileno()
3
Unless there is demand for making these cases non-inheritable, it might be
safest to leave them be. However it looks like the mmap file descriptor could
be internal (though I’m not an expert on that module to be sure). So you might
be okay with the mmap change.
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<http://bugs.python.org/issue26769>
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