Set SO_TIMESTAMP correctly for the various platforms

hbd/server/main.py

@@ -191,14 +191,14 @@ async def _run_async(config, config_path=None):
     sock.bind(bind_addr)
     logger.info("Starting UDP server on %s:%s", *bind_addr)
 
-    # Try to enable kernel receive timestamps (Linux SO_TIMESTAMPNS).
+    # Try to enable kernel receive timestamps (Linux SO_TIMESTAMP).
     # If supported, read datagrams via recvmsg() so RTT uses the kernel
     # timestamp rather than the time.time() call after asyncio scheduling.
     use_kernel_ts = udp.enable_kernel_timestamps(sock)
     if use_kernel_ts:
-        logger.info("SO_TIMESTAMPNS enabled: using kernel receive timestamps for RTT")
+        logger.info("SO_TIMESTAMP enabled: using kernel receive timestamps for RTT")
     else:
-        logger.info("SO_TIMESTAMPNS not available: using time.time() for RTT")
+        logger.info("SO_TIMESTAMP not available: using time.time() for RTT")
 
     def udp_handler(msg, addr, transport, recv_ts=None):
         ctx = dict(

hbd/server/udp.py

@@ -7,6 +7,8 @@ import time
 import zlib
 import logging
 
+from platform import system as platform_system
+
 from ..common.proto import stodict, oldmtodict
 from ..common.utils import dur
 from . import notify as notify_mod
@@ -16,9 +18,18 @@ eventlog = notify_mod.eventlog
 
 # SO_TIMESTAMP: kernel attaches a struct timeval to each received datagram.
 # Supported on Linux, FreeBSD, and macOS.  The constant is not exposed by
-# Python's socket module on all platforms, so fall back to the Linux value (29)
-# when absent.
-_SO_TIMESTAMP = getattr(socket, 'SO_TIMESTAMP', 29)
+# Python's socket module on all platforms 
+platform = platform_system()
+if platform == "Darwin":
+    _SO_TIMESTAMP = 1024  # SO_TIMESTAMP on macOS (not in Python's socket module)
+elif platform == "Linux":
+    _SO_TIMESTAMP = 29  # Linux value (not in older Python versions)
+elif platform == "FreeBSD":
+     _SO_TIMESTAMP = 32  # FreeBSD value (not in older Python versions)
+else:
+    logger.warning("SO_TIMESTAMP may not be supported on this platform (%s)", platform)
+    _SO_TIMESTAMP = None
+
 # struct timeval uses two native C longs: tv_sec and tv_usec
 _TIMEVAL = struct.Struct('@ll')