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Fix UDP multicast interface on MacOS #1940

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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
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9 changes: 8 additions & 1 deletion 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 @@ -21,6 +22,8 @@
ioctl_supported = False
pass

# All ioctls aren't supported on MacOS.
is_macos = platform.system() == "Darwin"

log = logging.getLogger(__name__)

Expand Down Expand Up @@ -275,6 +278,10 @@ 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 +408,7 @@ def recv(
self.max_buffer
)

if ioctl_supported:
if ioctl_supported and not is_macos:
result_buffer = ioctl(
self._socket.fileno(),
SIOCGSTAMP,
Expand Down
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