getnameinfo and various protocol types

[itojun@iijlab.net]

	getnameinfo(3) specification assumes that there are only two transport
	protocols - tcp and udp.  when performing service name lookup
	it would use "tcp" if NI_DGRAM is not specified, and "udp" when
	NI_DGRAM is specified.

	now we have couple of new transport protocols coming, such as SCTP and
	DCCP.  how can we support service name lookup for those?  i.e.
	how can we tell getnameinfo(3) to use "sctp" or "dccp" for the 2nd
	argument of getservbyport(3)?

	my proposal:
	define NI_UDP as replacement of NI_DGRAM.  deprecate NI_DGRAM (keep
	it as an alias to NI_UDP is okay).  define NI_SCTP, NI_DCCP and such.
	these three are mutually exclusive, and if more than one is specified
	it would cause EAI_FAIL.

itojun

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