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-rw-r--r--serial/tools/list_ports_osx.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/serial/tools/list_ports_osx.py b/serial/tools/list_ports_osx.py
index f6308c9..51b4e8c 100644
--- a/serial/tools/list_ports_osx.py
+++ b/serial/tools/list_ports_osx.py
@@ -30,7 +30,8 @@ from serial.tools import list_ports_common
iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')
-kIOMasterPortDefault = ctypes.c_void_p.in_dll(iokit, "kIOMasterPortDefault")
+# kIOMasterPortDefault is no longer exported in BigSur but no biggie, using NULL works just the same
+kIOMasterPortDefault = 0 # WAS: ctypes.c_void_p.in_dll(iokit, "kIOMasterPortDefault")
kCFAllocatorDefault = ctypes.c_void_p.in_dll(cf, "kCFAllocatorDefault")
kCFStringEncodingMacRoman = 0