Hello Stéphane,
On 03/08/2015 01:03 PM, Stéphane Aulery wrote:
> Hi Michael,
>
> I made another patch with all your remarks.
Did you send it already. (No hurry--it's just that I wonder if I missed it.)
> Le dimanche 08 mars 2015 à 09:20:18, Michael Kerrisk (man-pages) a écrit :
>>
>>> +.TP
>>> +.B RES_USE_INET6
>>> +Try a AAAA query before an A query inside the
>>
>> s/a AAAA/an AAAA/
>
> This is a copy of resolv.conf.5. I will fix this too.
Yup. Thanks.
>>> +.B RES_BLAST
>>> +When resolvers want to even out the load on their nameservers, following
>>> +them.
>>
>> I do not understand that last sentence. Could you clarify please.
>
> I must admit that it's not clear to me either. I think this means that
> server alias are swapped between each request. I have wrong? The word
> "blast" leaves me skeptical.
>
> What I found in code source:
>
>>From resolv.h:
>
> #define RES_BLAST 0x00020000 /* blast all recursive servers */
>
> Form res_send.c
>
> /*
> * Some resolvers want to even out the load on their nameservers.
> * Note that RES_BLAST overrides RES_ROTATE.
> */
> if (__builtin_expect ((statp->options & RES_ROTATE) != 0, 0) &&
> (statp->options & RES_BLAST) == 0) {
> struct sockaddr_in6 *ina;
> unsigned int map;
>
> n = 0;
> while (n < MAXNS && EXT(statp).nsmap[n] == MAXNS)
> n++;
> if (n < MAXNS) {
> ina = EXT(statp).nsaddrs[n];
> map = EXT(statp).nsmap[n];
> for (;;) {
> ns = n + 1;
> while (ns < MAXNS
> && EXT(statp).nsmap[ns] == MAXNS)
> ns++;
> if (ns == MAXNS)
> break;
> EXT(statp).nsaddrs[n] = EXT(statp).nsaddrs[ns];
> EXT(statp).nsmap[n] = EXT(statp).nsmap[ns];
> n = ns;
> }
> EXT(statp).nsaddrs[n] = ina;
> EXT(statp).nsmap[n] = map;
> }
> }
Okay -- I leave it to your discretion to choose what to do here.
>>> Note this option overrides
>>> +.BR RES_ROTATE .
>>> +.TP
>>> +.B RES_USEBSTRING
>>> +Make reverse IPv6 lookups using the bit-label format described in RFC 2673;
>>> +if this option is not set, then nibble format is used (since glibc 2.3.4).
>>
>> Does the "(since glibc 2.3.4)" apply to the option, or to the
>> "then nibble format is used"? It's not clear. If the former, then write
>
> I don't no. I picked this from resolv.conf.5.
> It should be for RES_USEBSTRING.
Okay.
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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