From 228f8f78073dc4ed0e63fff01c19596c50115d40 Mon Sep 17 00:00:00 2001
From: Xu Lingrui <lrxu0818@gmail.com>
Date: Wed, 3 Jun 2026 00:02:55 +0800
Subject: [PATCH] fix: Windows PID check

---
 openspace/communication/gateway_runtime.py | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/openspace/communication/gateway_runtime.py b/openspace/communication/gateway_runtime.py
index 60c92cb..0d48928 100644
--- a/openspace/communication/gateway_runtime.py
+++ b/openspace/communication/gateway_runtime.py
@@ -38,14 +38,30 @@ def _is_pid_alive(pid: int) -> bool:
     try:
         if sys.platform == "win32":
             import ctypes
-            kernel32 = ctypes.windll.kernel32
+            from ctypes import wintypes
+
+            kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)
             PROCESS_QUERY_LIMITED_INFORMATION = 0x1000
             STILL_ACTIVE = 259
+            ERROR_ACCESS_DENIED = 5
+
+            kernel32.OpenProcess.argtypes = [wintypes.DWORD, wintypes.BOOL, wintypes.DWORD]
+            kernel32.OpenProcess.restype = wintypes.HANDLE
+            kernel32.GetExitCodeProcess.argtypes = [
+                wintypes.HANDLE,
+                ctypes.POINTER(wintypes.DWORD),
+            ]
+            kernel32.GetExitCodeProcess.restype = wintypes.BOOL
+            kernel32.CloseHandle.argtypes = [wintypes.HANDLE]
+            kernel32.CloseHandle.restype = wintypes.BOOL
+
             handle = kernel32.OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, False, pid)
             if not handle:
+                if ctypes.get_last_error() == ERROR_ACCESS_DENIED:
+                    return True
                 return False
             try:
-                exit_code = ctypes.c_ulong()
+                exit_code = wintypes.DWORD()
                 if kernel32.GetExitCodeProcess(handle, ctypes.byref(exit_code)):
                     return exit_code.value == STILL_ACTIVE
                 return False