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resolv.conf.5: Document RES_SNGLKUPREOP 

Fix Ubuntu bug #1110781:
https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/1110781
This bug have been partially resolved by commit
aa87a3f3f8 and tagged
fixed-upstream by Simon Paillard for Debian bug #699387.

The Ubuntu bug #1110781 report is more comprehensive and passing
I saw that RES_SNGLKUPREOP was missed.

Reported-by: Thomas Hood <jdthood@gmail.com>
Signed-off-by: Stéphane Aulery <saulery@free.fr>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Stéphane Aulery 2015-04-22 02:21:11 +02:00 committed by Michael Kerrisk
parent 174dfad254
commit f6ab153e73
1 changed files with 4 additions and 0 deletions
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4
man5/resolv.conf.5
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@ -255,6 +255,10 @@ and IPv4 requests sequentially (at the cost of some slowdown of the
resolving process). resolving process).
.TP .TP
.BR single-request-reopen " (since glibc 2.9)" .BR single-request-reopen " (since glibc 2.9)"
sets
.BR RES_SNGLKUPREOP
in
.IR _res.options .
The resolver uses the same socket for the A and AAAA requests. The resolver uses the same socket for the A and AAAA requests.
Some hardware mistakenly sends back only one reply. Some hardware mistakenly sends back only one reply.
When that happens the client system will sit and wait for the second reply. When that happens the client system will sit and wait for the second reply.