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Fix UDP multicast interface on MacOS #1940

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Merged
zariiii9003 merged 4 commits into from
Jun 13, 2025
Merged

Fix UDP multicast interface on MacOS #1940

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6511bc3
Add sock option SO_REUSEPORT to allow udp multicast on macos
Dennis-Johnson May 18, 2025
029f7f2
macos doesn't support ioctl SIOCGSTAMP
Dennis-Johnson May 18, 2025
9956d8b
REUSE PORT option not supported on windows
Dennis-Johnson May 19, 2025
fd1ed40
only import ioctl on linux
Dennis-Johnson Jun 12, 2025
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17 changes: 9 additions & 8 deletions can/interfaces/udp_multicast/bus.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import errno
import logging
import platform
import select
import socket
import struct
Expand All @@ -13,14 +14,9 @@

from .utils import check_msgpack_installed, pack_message, unpack_message

ioctl_supported = True

try:
is_linux = platform.system() == "Linux"
if is_linux:
from fcntl import ioctl
except ModuleNotFoundError: # Missing on Windows
ioctl_supported = False
pass


log = logging.getLogger(__name__)

Expand Down Expand Up @@ -275,6 +271,10 @@ def _create_socket(self, address_family: socket.AddressFamily) -> socket.socket:
# Allow multiple programs to access that address + port
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Option not supported on Windows.
if hasattr(socket, "SO_REUSEPORT"):
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)

# set how to receive timestamps
try:
sock.setsockopt(socket.SOL_SOCKET, SO_TIMESTAMPNS, 1)
Expand Down Expand Up @@ -401,7 +401,8 @@ def recv(
self.max_buffer
)

if ioctl_supported:
if is_linux:
# This ioctl isn't supported on Darwin & Windows.
result_buffer = ioctl(
self._socket.fileno(),
SIOCGSTAMP,
Expand Down