IPC - Socket Pair

IPC between parent and child processes.

Solution

import logging
import os
import socket

logging.basicConfig(
    level=logging.DEBUG, style='{', format='[{processName} ({process})] {message}'
)

parent, child = socket.socketpair()  # AF_UNIX by default
assert isinstance(parent, socket.socket)
assert isinstance(child, socket.socket)

pid = os.fork()
if pid:
    # parent process
    child.close()
    data = b'data'
    parent.sendall(data)
    logging.debug(f'parent sent: {data!r}')
    data = parent.recv(1024)
    logging.debug(f'parent recv: {data!r}')
    parent.close()
else:
    # child process
    parent.close()
    data = child.recv(1024)
    logging.debug(f'child recv: {data!r}')
    child.sendall(data)
    logging.debug(f'child sent: {data!r}')
    child.close()

See source code.

References