STINNER Victor added the comment:
"the parent can know precisely which FD was opened by
the preexec hook, and check it's closed in the child process."
Oh ok, I see:
+ self.assertNotIn(fd, remaining_fds)
You might also add a check:
self.assertLessEqual(remaining_fds, {0, 1, 2})
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<http://bugs.python.org/issue18763>
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