Overlooked that part of On Monday 12 March 2007 17:08, 
Rémi Denis-Courmont wrote:
> This new version still breaks ABI compatibility, 
> meaning any implementors would have to rebuild any
> software using getaddrinfo against a new library.

[...]

Sorry, overlooked that part below:

> To avoid this, either a new API is defined (e.g.  
> geteaddrinfo with a struct eaddrinfo), or preference
> flags are stored in ai_flags which still has more
> than enough bits available for this purpose.

The reason for introduction of the extended flag is 
that indeed someone complained that the ai_flags field 
will get crowded, and worse, to IPv6 benefit only.

--julien

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