New submission from giangy <[email protected]>:
I am connecting to a server using a multicast UDP socket.
Running two instances of the code below, in two shell windows on the same
computer, it works on both Windows 10 and Ubuntu 18.04, but it fails on Mac OS
10.15.7, reporting:
>>> sock.bind(('', MCAST_PORT))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: [Errno 48] Address already in use
~~
import socket
CLIENT_IP = '192.168.1.53'
MCAST_ADDR = '239.0.1.1'
MCAST_PORT = 10000
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_IF,
socket.inet_aton(CLIENT_IP))
sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP,
socket.inet_aton(MCAST_ADDR) + socket.inet_aton(CLIENT_IP))
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF,
socket.inet_aton(CLIENT_IP))
sock.bind(('', MCAST_PORT))
----------
components: Library (Lib), macOS
messages: 392641
nosy: ned.deily, ronaldoussoren, sforzagianluca
priority: normal
severity: normal
status: open
title: multiple socket bind failure on Mac OS X with SO_REUSEADDR
type: behavior
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue44005>
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