commit e5477f83b0a639b86d8cbe710f25d9808a8f72af
author Lorenzo Colitti <lorenzo@google.com> Fri Nov 28 20:03:23 2014 +0900
committer Lorenzo Colitti <lorenzo@google.com> Mon Dec 01 20:03:25 2014 +0000
tree 5928315c3044dd857e1c30c435135d5bb6d3309b
parent 432f645887466ed7099addb20fa8915c8a29fcab

Fail queries fast if no DNS servers are configured.

When no DNS servers are configured (and thus there is no chance
that the DNS query will suceed), res_nsend returns early, but
it does not tell the cache that the query has failed.
Therefore, if the caller retries the query, it will block for
PENDING_REQUEST_TIMEOUT (= 20 seconds) waiting for the "existing
query" (which isn't actually doing anything) to complete.

Bug: 18240188
Bug: 18327075
Change-Id: I0df13ff4a17ee65e640be96695a3af31b020963a