How do I clear Warning Message When Using SHM C to Python

multiprocessing.sharedmemory assumes Python is managing the shared memory, so its resourcetracker warns when it sees a segment that wasn't unlinked by Python. Since your C program owns the lifetime (shmunlink), the warning is expected.

shm = sharedmemory.SharedMemory(name=shmname, track=False)

On older Python versions (like 3.10), track=False isn't available, so there's no clean way to disable the warning. In that case, you can either ignore it or use a lower-level API such as posixipc/mmap instead of multiprocessing.shared_memory when C owns the shared memory