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#define NETDB_INTERNAL -1 /* see errno */
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#define NETDB_SUCCESS 0 /* no problem */
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#define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */
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#define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
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#define NO_DATA 4 /* Valid name, no data record of requested type */
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#define NO_ADDRESS NO_DATA /* no address, look for MX record */