/usr/lib/python3/dist-packages/Cython/Includes/posix/ioctl.pxd is in cython3 0.25.2-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 | cdef extern from "<sys/ioctl.h>" nogil:
enum: FIONBIO
int ioctl(int fd, int request, ...)
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