Fix race condition caused by fd reused for DnsResolver
There might be a gap between fd close and fd event listener unregister.
If fd is reused for another query during that gap, it might cause the
query failed with no response since addOnFileDescriptorEventListener
method failed. To fix this problem, we must ensure that fd event
listener is unregistered before fd closing.
Bug: 134310704
Test: atest DnsResolverTest
Merged-In: I443bb11b15845b079ee4370a7797e692e62fa3c8
(cherry picked from commit 07de4cf82ac09f8b9f37afa9eb1b7a44b43b6fe6)
Change-Id: I7041e67d8c906cbf88050e7d94245f8e15dcdbb4
1 file changed