SO_REUSEPORT is deleted to make the example work on macOS.
Socket programming - setsockopt: Protocol not available?
But man setsockopt on macOS clearly document the option SO_REUSEPORT.
SO_REUSEPORT enables duplicate address and port bindings
Why SO_REUSEPORT has to be removed to make the example? Is there a bug in setsockopt() on macOS? Where is the source code of setsockopt() on macOS?
