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socket
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... If you are developing a protocol or application that will require the
use of a link, socket, port, protocol, etc., please contact the IANA
...
... RPC_ANY (-1) which effectively means "I don't care." In the "I
don't care" case the create code simply calls socket(2) or t_open(3n)
which allocates an IP port ...
...
b) inetd - which will automatically create sockets for those
services that have reserved ports ...
... registry of previously allocated ports. Note "allocated" here is
being used in the sense that they are used by an open socket, not
assigned a well known name.
...