/usr/lib/python3.7/test/mp_preload.py is in libpython3.7-testsuite 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | import multiprocessing
multiprocessing.Lock()
def f():
print("ok")
if __name__ == "__main__":
ctx = multiprocessing.get_context("forkserver")
modname = "test.mp_preload"
# Make sure it's importable
__import__(modname)
ctx.set_forkserver_preload([modname])
proc = ctx.Process(target=f)
proc.start()
proc.join()
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