Revert "Assume F_FULLFSYNC on darwin"

CHANGELOG.md

@@ -6,7 +6,6 @@
 
 * Fallback if RENAME_EXCHANGE is not supportd by the filesystem
 * Assume POSIX compatibility if `sys.platform` is not `win32`
-* Assume `F_FULLFSYNC` always exists if `sys.platform` is `darwin`
 
 ## 3.1.3
 

radicale/pathutils.py

@@ -193,7 +193,7 @@ def rename_exchange(src: str, dst: str) -> None:
 
 
 def fsync(fd: int) -> None:
-    if sys.platform == "darwin":
+    if sys.platform != "win32" and hasattr(fcntl, "F_FULLFSYNC"):
         fcntl.fcntl(fd, fcntl.F_FULLFSYNC)
     else:
         os.fsync(fd)