ovs-lib: Handle daemon segfaults during exit.

Currently, we terminate a daemon by trying
"ovs-appctl exit", "SIGTERM" and finally "SIGKILL".
But the logic fails if during "ovs-appctl exit", the
daemon crashes (segfaults). The monitor will automatically
restart the daemon with a new pid. The current logic of
checking the non-existance of old pid succeeds and we proceed
with the assumption that the daemon is dead.

This is a problem during OVS upgrades as we will continue
to run the older version of OVS.

With this commit, we take care of this situation. If there
is a segfault, the pidfile is not deleted. So, we wait a
little to give time for the monitor to restart the daemon
(which is usually instantaneous) and then re-read the pidfile.

VMware-BZ: #2633995
Signed-off-by: Gurucharan Shetty <guru@ovn.org>
Acked-by: Yi-Hung Wei <yihung.wei@gmail.com>

0 files changed, 0 insertions, 0 deletions