Re: [PATCH] resolver.3: documents missing options used by _res structure defined in resolv.h and indicates defaults options

["Stéphane Aulery" <saulery-GANU6spQydw@public.gmane.org>]

Le lundi 09 mars 2015 à 08:24:38, Michael Kerrisk (man-pages) a écrit :
> 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.)

I was waiting your answers to the question bellow before.

> >>> +.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.

No please, I need your help.

-- 
Stéphane Aulery
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