Fix example script cleanup to terminate all child processes

The npm run dev command spawns child processes that weren't being
terminated when the parent PID was killed. This fix ensures proper
cleanup by using process groups and port-based killing as fallback.

Changes:
- Kill by process group (negative PID) to terminate child processes
- Add port-based killing via lsof as fallback for remaining processes
- Add INT and TERM signals to the cleanup trap

Author: RahulHere

examples/client_example_json_run.sh

@@ -14,19 +14,23 @@ NC='\033[0m' # No Color
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
 
-# Cleanup function
+# Cleanup function - kill process groups to ensure all child processes are terminated
 cleanup() {
     echo -e "\n${YELLOW}Cleaning up...${NC}"
+    # Kill by process group (negative PID)
     if [ -n "$SERVER3001_PID" ]; then
-        kill $SERVER3001_PID 2>/dev/null || true
+        kill -- -$SERVER3001_PID 2>/dev/null || kill $SERVER3001_PID 2>/dev/null || true
     fi
     if [ -n "$SERVER3002_PID" ]; then
-        kill $SERVER3002_PID 2>/dev/null || true
+        kill -- -$SERVER3002_PID 2>/dev/null || kill $SERVER3002_PID 2>/dev/null || true
     fi
+    # Also kill any remaining node processes on the specific ports
+    lsof -ti:3001 | xargs kill 2>/dev/null || true
+    lsof -ti:3002 | xargs kill 2>/dev/null || true
     echo -e "${GREEN}Done${NC}"
 }
 
-trap cleanup EXIT
+trap cleanup EXIT INT TERM
 
 echo -e "${GREEN}======================================${NC}"
 echo -e "${GREEN}Running PHP Client Example${NC}"