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Restart server if it double-forks

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Processes that double-fork themselves by double-forking cannot be waited
upon, and cannot be properly monitored.

The ARK server will sometimes restart itself by performing a fork and
execve instead of just an execve (presumably because that is what it has
to do under Windows).

If the server restarts itself, then we need to restart it again so it
can be properly monitored.
This commit is contained in:
Ben Peddell 2023-04-15 02:15:42 +10:00
parent f59a4292cf
commit ef8f3322f3
1 changed files with 31 additions and 5 deletions
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36
tools/arkmanager
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@ -980,6 +980,8 @@ function getServerPID(){
if kill -0 "$serverpid" >/dev/null 2>&1; then
echo "$serverpid"
return
elif kill -0 "-$serverpid" >/dev/null 2>&1; then
pgrep -g "$serverpid" && return
fi
fi
if [ -f "${arkserverroot}/${arkserveroldpidfile}" ]; then
@ -987,6 +989,8 @@ function getServerPID(){
if kill -0 "$serverpid" >/dev/null 2>&1; then
echo "$serverpid"
return
elif kill -0 "-$serverpid" >/dev/null 2>&1; then
pgrep -g "$serverpid" && return
fi
fi
}
@ -1316,13 +1320,16 @@ doRun() {
notify "${notifyMsgShuttingDown:-Shutting down}"
rm -f "$arkserverroot/$arkautorestartfile"
if [ "$serverpid" -ne 0 ]; then
kill -INT $serverpid >/dev/null 2>&1
kill -INT -$serverpid >/dev/null 2>&1
fi
exit 0
}
trap shutdown_server INT TERM
# Enable job control so server gets its own process group
set -m
# Auto-restart loop
while [ $restartserver -ne 0 ]; do
echo -n "$(timestamp): Running"
@ -1374,21 +1381,40 @@ doRun() {
echo "$(timestamp): Restarting server"
notify "${notifyMsgStoppedListening:-Server has stopped listening - restarting}"
for (( i = 0; i < 5; i++ )); do
if ! kill -0 "$serverpid"; then
if ! kill -0 "-$serverpid"; then
break
fi
kill -INT "$serverpid"
kill -INT "-$serverpid"
sleep 5
done
if kill -0 "$serverpid"; then
if kill -0 "-$serverpid"; then
echo "$(timestamp): Graceful restart failed - killing server"
kill -KILL "$serverpid"
kill -KILL "-$serverpid"
fi
# Exit the server check loop
break
fi
fi
elif [ "$pid" == "$(pgrep --pgroup $serverpid)" ]; then
restartserver=1
echo "${timestamp}: Server has double-forked and cannot be effectively monitored"
echo "${timestamp}: Restarting server"
notify "${notifyMsgDoubleForked:-Server has daemonized itself - restarting}"
for (( i = 0; i < 5; i++ )); do
if ! kill -0 "-$serverpid"; then
break
fi
kill -INT "-$serverpid"
sleep 5
done
if kill -0 "-$serverpid"; then
echo "$(timestamp): Graceful restart failed - killing server"
kill -KILL "-$serverpid"
fi
# Exit the server check loop
break
else
echo "$(timestamp): Bad PID '$pid'; expected '$serverpid'"
if [ "$pid" != "" ]; then