EAI_AGAIN          The name could not be resolved at this time.
                       Future attempts may succeed.
    EAI_BADFLAGS       The flags parameter had an invalid value.
    EAI_FAIL           A nonrecoverable error occurred when
                       attempting to resolve the name.
    EAI_FAMILY         The address family was not recognized.
    EAI_MEMORY         There was a memory allocation failure when
                       trying to allocate storage for the return
                       value.
    EAI_NONAME         The name does not resolve for the supplied
                       parameters. Neither nodename nor servname
                       were supplied. At least one of these must be
                       supplied.
    EAI_SERVICE        The service passed was not recognized for the
                       specified socket type.
    EAI_SOCKTYPE       The intended socket type was not recognized.
    EAI_SYSTEM         A system error occurred; the error code can be
                       found in errno.