linux - Why are gethostbyname and gethostbyaddr considered obsolete? -

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the man page gethostbyname(3) states functions gethostbyname , gethostbyaddr obsolete, , getaddrinfo(3) , getnameinfo(3) should used instead. doesn't, however, explain reason why former obsolete. can please point me resource explains matter further?

from opengroup

the gethostbyaddr() andgethostbyname() functions may return pointers static data, may overwritten subsequent calls of these functions.

the getaddrinfo() , getnameinfo() functions preferred on gethostbyaddr() , gethostbyname() functions.

posix cautions gethostbyaddr() andgethostbyname() may withdrawn in future version of spec. other reason these 2 functions can't work ipv6 well, getaddrinfo() , getnameinfo() should used instead.


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