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After testing is_valid_fd() (from Python/pylifecycle.c) separately
(an `is_valid_fd.c' file will be attached to ease reproduction) I think
that also NetBSD is affected by bpo-30225.
Using dup(2) (at is currently done in NetBSD):
 % cc -o ivf is_valid_fd.c
 % sleep 5 && ./ivf > /tmp/log & exit
 [... the terminal is closed via ^D ...]
 % cat /tmp/log
 0: 1
 1: 1
 2: 1
Using fstat(2):
 % cc -DUSE_FSTAT -o ivf is_valid_fd.c
 % sleep 5 && ./ivf > /tmp/log & exit
 [... the terminal is closed via ^D ...]
 % cat /tmp/log
 0: 0
 1: 1
 2: 0
The possible attached patch seems to fix the problem reported by Martin.