Opens a raw socket.
@param protocolFamily The protocol family of the socket (e.g.,{@link #PF_INET} or {@link #PF_INET6}).
@param protocol The protocol within the protocol family. {@link #getProtocolByName} should be used to obtain protocol numbers.
@exception IllegalStateException If the object instance isalready open.
@exception IOException If an error occurs while opening the socket.
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