tree 6260917e5228a7a864219de76722c25b10a58f41
parent bb833563aff5a55777e206d0b640c7cbff5f7417
author Peter Qiu <zqiu@chromium.org> 1421872061 -0800
committer ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> 1422042903 +0000

shill: factor out ActiveLinkMonitor from LinkMonitor

ActiveLinkMonitor monitors the link status by sending ARP requests
and probing for ARP replies. Once the active link monitor is started,
the link will be declared as failure if it failed to receive ARP reply
for 5 consecutive broadcast ARP requests or unicast ARP requests in the
case when gateway unicast ARP support is established. A callback will be
invoked and ActiveLinkMonitor will automatically stopped when the link
status is deteremined.

BUG=chromium:422159
TEST=USE="asan clang" FEATURES=test emerge-$BOARD shill

Change-Id: I8a662b5f1c0b4ee4450f2327f5cdd03feb231b8b
Reviewed-on: https://chromium-review.googlesource.com/242278
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Zeping Qiu <zqiu@chromium.org>
Trybot-Ready: Zeping Qiu <zqiu@chromium.org>
Tested-by: Zeping Qiu <zqiu@chromium.org>