From 12b55cb679650a8b30db99be42e603d75e3b893b Mon Sep 17 00:00:00 2001
From: kouyouqi123 <1696906464@qq.com>
Date: Wed, 3 Jun 2026 11:40:58 +0800
Subject: [PATCH] fix: lazy-import fcntl to prevent crash on Windows

---
 src/trcc/adapters/system/linux.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/trcc/adapters/system/linux.py b/src/trcc/adapters/system/linux.py
index 69a45676..9b1b23ad 100644
--- a/src/trcc/adapters/system/linux.py
+++ b/src/trcc/adapters/system/linux.py
@@ -13,7 +13,6 @@
 from __future__ import annotations
 
 import ctypes
-import fcntl
 import logging
 import os
 from pathlib import Path
@@ -312,6 +311,8 @@ def close(self) -> None:
         self._write_bufs.clear()
 
     def send_cdb(self, cdb: bytes, data: bytes,
+        import fcntl  # lazy import: not available on non-Linux platforms
+
                  timeout_ms: int = 5000) -> bool:
         """SCSI CDB + data-out via single SG_IO ioctl.  True on status 0."""
         log.debug("LinuxScsiTransport.send_cdb: cdb_len=%d data_len=%d timeout=%dms",