Any equivalent of lwip_select() with Keil DS stack?

I am porting a modbus stack into my current project. The source code is using lwIP stack which I don't. I am using mdk-pro dual stack with BSD socket.

There are a few functions which I cannot find equivalent.

Here is the one I am looking for:

- lwip_select()
- lwip_selscan()
- get_socket()

Thank you

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