fix: resolve port 7860 conflicts from zombie processes during restart

app.py

@@ -1,10 +1,54 @@
 import asyncio
 import json
 import os
+import signal
 from pathlib import Path
 from dotenv import load_dotenv
 load_dotenv()
 
+def kill_process_on_port(port):
+    try:
+        # Hex representation of port (e.g. 7860 -> 1EB4)
+        port_hex = f"{port:04X}"
+        inodes = []
+        if os.path.exists("/proc/net/tcp"):
+            with open("/proc/net/tcp", "r") as f:
+                for line in f:
+                    parts = line.split()
+                    if len(parts) > 9:
+                        local_addr = parts[1]
+                        local_port = local_addr.split(":")[-1]
+                        if local_port == port_hex:
+                            inodes.append(parts[9])
+        
+        if inodes:
+            my_pid = os.getpid()
+            for pid_str in os.listdir("/proc"):
+                if not pid_str.isdigit():
+                    continue
+                pid = int(pid_str)
+                if pid == my_pid:
+                    continue
+                fd_dir = f"/proc/{pid_str}/fd"
+                if not os.path.exists(fd_dir):
+                    continue
+                try:
+                    for fd in os.listdir(fd_dir):
+                        link = os.readlink(f"{fd_dir}/{fd}")
+                        for inode in inodes:
+                            if f"socket:[{inode}]" in link:
+                                print(f"Self-Healing: Killing zombie process {pid} using port {port}", flush=True)
+                                os.kill(pid, signal.SIGKILL)
+                                break
+                except Exception:
+                    continue
+    except Exception as e:
+        print(f"Error checking/killing process on port {port}: {e}", flush=True)
+
+# Free port 7860 before trying to launch Gradio
+kill_process_on_port(7860)
+
+
 import gradio as gr
 
 # --- Gradio 5.x BugFix Monkeypatch ---