Add select interface support #899
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Added select function support to partially implement the select interface. This requires modifying the ff_kernel_max_fd value to ensure TCP/UDP sockets using the userspace protocol stack don't start from FD 1024, since select has FD number limitations due to its bitmask implementation.we implemented a fast bit polling approach that.
2.Calls their respective select interfaces
3.Merges the results before returning to userspace
The current first version only guarantees basic functionality works. We observe memcpy operations being used in the process, and will investigate potential optimizations for this part later.