tree def8e2f3947cb6e201a2f2c932dddabe69896998
parent 72799f37c67ec1273b740dd37061772988f093a7
author Luke Huang <huangluke@google.com> 1618381685 +0800
committer Luke Huang <huangluke@google.com> 1618491586 +0000

Fix the unexpected getaddrinfo error code changing due to parallel lookup

Parallel lookup unexpectedly changed the error code when the queries are
blocked by system.
2 problems here,
    1. the errno from query thread isn't correctly propagated to the main
thread.
    2. The rcode handling is changed.
Fix them in this CL and also add a test for this problem.

Bug: 185097438
Test: atest
Change-Id: I4c8e2895baa9d3d8ece40fe7bb8c3975672997a4