From c020936d7fc19978661e9ad3851e8635230e4141 Mon Sep 17 00:00:00 2001
From: Andrew Pimenov <pimenoffandrew@gmail.com>
Date: Sun, 9 Aug 2026 02:30:15 +0300
Subject: [PATCH] icmp_win: guard windows-only imports so the module is
 importable cross-platform

---
 src/netcheck/probes/icmp_win.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/netcheck/probes/icmp_win.py b/src/netcheck/probes/icmp_win.py
index 7393243..d800069 100644
--- a/src/netcheck/probes/icmp_win.py
+++ b/src/netcheck/probes/icmp_win.py
@@ -51,9 +51,12 @@ import ctypes
 import platform
 import socket
 import time
-from ctypes import wintypes
 
 _REPLY_BUFFER_SIZE = 4096
+_IS_WINDOWS = platform.system() == "Windows"
+
+if _IS_WINDOWS:
+    from ctypes import wintypes
 
 
 class _IpOptionInformation(ctypes.Structure):
@@ -77,6 +80,8 @@ def win_icmp_available() -> bool:
 
 
 def _handle():
+    if not _IS_WINDOWS:
+        raise OSError("icmp_win backend is only available on Windows")
     iphlpapi = ctypes.WinDLL("Iphlpapi.dll")
     iphlpapi.IcmpCreateFile.restype = wintypes.HANDLE
     # argtypes must be declared for HANDLE-typed args: ctypes otherwise