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EAI_MEMORY is not possible (but would not provide errno if it were)
and EAI_FAIL does not provide errno. treat the latter as EBADMSG to
match how it's handled in gethostbyname2_r (it indicates erroneous or
failure response from the nameserver).
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according to the documentation in the man pages, the GNU extension
functions gethostbyaddr_r, gethostbyname_r and gethostbyname2_r are
guaranteed to set the result pointer to NULL in case of error or no
result.
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they're supposed to return an error code rather than using errno.
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