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-rw-r--r--Lib/shutil.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/shutil.py b/Lib/shutil.py
index e29fe4d..55cfe35 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -40,6 +40,8 @@ elif _WINDOWS:
import nt
COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 64 * 1024
+# This should never be removed, see rationale in:
+# https://bugs.python.org/issue43743#msg393429
_USE_CP_SENDFILE = hasattr(os, "sendfile") and sys.platform.startswith("linux")
_HAS_FCOPYFILE = posix and hasattr(posix, "_fcopyfile") # macOS