commit 0d4a60083ee1d7e713f09bd78c22e771030e1a9d
author Yi Kong <yikong@google.com> Tue Dec 13 15:15:25 2016 +0000
committer Yi Kong <yikong@google.com> Thu Dec 15 15:45:00 2016 +0000
tree d973e3f47454ee2bf7b9463dd32c835da2ebee07
parent c6c543e1738250d87ed2bdcfe8fe8e6e3f5c0245

Revert "Revert "recvfrom should set srcAddress for empty packets""

This reverts commit 94767318786fec526121498a4aba2f1dc07dd3c8.

recvfrom(2) may return 0 if:
 * packet received has zero length
 * the socket has performed orderly shutdown

Previous Libcore change 6e888e9 tried to handle the second case but
broke the first case and never fills in srcAddress for empty packets.

Added a condition to only fill in srcAddress if the sockaddr is an
InetSocketAddress.

Test: libcore.io.OsTest
Bug: 33483694
Bug: 27294715
Bug: 27233089
Change-Id: I50847bf813e20b02f5ac88d664e77622c28f3704