Richard Oudkerk added the comment:
Could you try the following program:
import socket
import multiprocessing
import multiprocessing.reduction
import multiprocessing.connection
def socketpair():
with socket.socket() as l:
l.bind(('localhost', 0))
l.listen(1)
s = socket.socket()
s.connect(l.getsockname())
a, _ = l.accept()
return s, a
def bar(s):
print(s)
s.sendall(b'from bar')
if __name__ == '__main__':
a, b = socketpair()
p = multiprocessing.Process(target=bar, args=(b,))
p.start()
b.close()
print(a.recv(100))
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