Finding a free port

Does anyone know the best way to find a free port for listening on?

At present I just start at a base port number and attempt bind() until it succeeds, incrementing the port number on each attempt.
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alcockbaAsked:
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kejinCommented:
You only need set the binding port to 0 and let the system
to select a free port for you dynamically. Once the bind()
returned, you can use getsockname() on the socket to find
out what is the system selected port number.
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