res_query() questions

Hi,

I'm currently trying hard to understand the magic of dietlibc's
res_query(). But it seems that I'm completely lost in space. I've tried to
understand the case where 

 * WANT_PLUGPLAY_DNS is *un*set
 * WANT_IPV6_DNS is set

So here my results (and/or questions)

1:

 * the return value of __dns_make_fd()/__dns_make_fd6() isn't checked, so the
   following sendto() may operate on an invalid filedescriptor.
 * as a result of this operation sendto() returns -1 and res_query() fails
   with HOST_NOT_FOUND
 * any additional name servers listed in /etc/resolv.conf are ignored

2:

 * If sendto() succeeds, gettimeofday(last) is called but immediately after
   that, the result gets overwritten by "last=now"
 * Next, 'i' will be increased so we have the chance to ask the next
   name server.
 * After that we polling the current name server. If a timeout occurs after
   one second we continue.
 * The next sendto() will be performed only after 10 seconds, so we are
   polling the same name server again. This may be indented, but 'i' gets
   increased too.
 * So, it is undefined which name server will be asked after the mentioned 10
   seconds?

I'm completely confused. Maybe someone can enlighten me. I could try to fix
this to some extend but I have no idea what to do with all the PlugNPray
stuff.

Gernot