如何在Windows上模拟socket.socketpair

Question

遗憾的是，标准的socket.socketpair函数在Windows上是不可用的(从Python3.4.1开始)，我如何编写一个可以同时工作在Unix和Windows上的替换程序？

Answer 1

import socket
import errno


def create_sock_pair(port=0):
    """Create socket pair.

    If socket.socketpair isn't available, we emulate it.
    """
    # See if socketpair() is available.
    have_socketpair = hasattr(socket, 'socketpair')
    if have_socketpair:
        client_sock, srv_sock = socket.socketpair()
        return client_sock, srv_sock

    # Create a non-blocking temporary server socket
    temp_srv_sock = socket.socket()
    temp_srv_sock.setblocking(False)
    temp_srv_sock.bind(('', port))
    port = temp_srv_sock.getsockname()[1]
    temp_srv_sock.listen(1)

    # Create non-blocking client socket
    client_sock = socket.socket()
    client_sock.setblocking(False)
    try:
        client_sock.connect(('localhost', port))
    except socket.error as err:
        # EWOULDBLOCK is not an error, as the socket is non-blocking
        if err.errno != errno.EWOULDBLOCK:
            raise

    # Use select to wait for connect() to succeed.
    import select
    timeout = 1
    readable = select.select([temp_srv_sock], [], [], timeout)[0]
    if temp_srv_sock not in readable:
        raise Exception('Client socket not connected in {} second(s)'.format(timeout))
    srv_sock, _ = temp_srv_sock.accept()

    return client_sock, srv_sock

Answer 2

Python3.5包括对socket.socketpair()的Windows支持。对于Python，您可以在2.7+上使用套餐 (我编写的)：

import socket
import backports.socketpair

s1, s2 = socket.socketpair()