[logrotate] Check orchagent status before sending SIGHUP

Sending SIGHUP before orchagent registers the handler for SIGHUP would kill orchagent.
Before sending SIGHUP, it must wait until orchagent has been running for 10 seconds.

Signed-off-by: chiourung_huang <[email protected]>

files/image_config/logrotate/rsyslog.j2

@@ -106,14 +106,23 @@
             if [ -f "$ASIC_CONF" ]; then
                 . $ASIC_CONF
             fi
-            if [ $NUM_ASIC -gt 1 ]; then
+            if [ ! -z $NUM_ASIC ] && [ $NUM_ASIC -gt 1 ]; then
                 log_file=$1
                 log_file_name=${log_file#/var/log/swss/}
-                logger -p syslog.info -t "logrotate" "Sending SIGHUP to OA log_file_name: $log_file_name"
-                pgrep -xa orchagent | grep $log_file_name | awk '{ print $1; }' | xargs /bin/kill -HUP 2>/dev/null || true
+                OA_PID=$(pgrep -xa orchagent | grep $log_file_name | awk '{ print $1; }')
             else
-                logger -p syslog.info -t "logrotate" "Sending SIGHUP to OA log_file_name: $1"
-                pgrep -x orchagent | xargs /bin/kill -HUP 2>/dev/null || true
+                log_file_name=$1
+                OA_PID=$(pgrep -x orchagent)
+            fi
+            if [ ! -z $OA_PID ]; then
+                # To avoid the condition that SIGHUP is sent before the registration of SIGHUP
+                # handler, send SIGHUP handler when the process has been up for more than 10 seconds
+                etimes=$(ps -p $OA_PID -o etimes | sed -n 2p)
+                if [ ! -z $etimes ] && [ $((etimes)) -lt 10 ]; then
+                   sleep $((10 - etimes))
+                fi
+                logger -p syslog.info -t "logrotate" "Sending SIGHUP to OA log_file_name: $log_file_name"
+                /bin/kill -HUP $OA_PID 2>/dev/null || true
             fi
         else
             /bin/kill -HUP $(cat /var/run/rsyslogd.pid)