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- extern int copyin (const void *userbuf, void *kernelbuf, size_t cn);
- extern int copyinmsg (const void *userbuf, void *kernelbuf, size_t cn);
- extern int copyout (const void *kernelbuf, void *userbuf, size_t cn);
- extern int copyoutmsg (const void *kernelbuf, void *userbuf, size_t cn);
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