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d72367b6f3
This adds EEXIST to distinguish between the following return values: 0: nobody was registered, registration successful EEXIST: the exact same handler was already registered, no registration required EBUSY: somebody else is registered, registration unsuccessful. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>