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# pylint: skip-file
# vendored from https://github.com/mhils/backports.socketpair
import sys
import socket
import errno
_LOCALHOST = '127.0.0.1'
_LOCALHOST_V6 = '::1'
if not hasattr(socket, "socketpair"):
# Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain.
def socketpair(family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0):
if family == socket.AF_INET:
host = _LOCALHOST
elif family == socket.AF_INET6:
host = _LOCALHOST_V6
else:
raise ValueError("Only AF_INET and AF_INET6 socket address families "
"are supported")
if type != socket.SOCK_STREAM:
raise ValueError("Only SOCK_STREAM socket type is supported")
if proto != 0:
raise ValueError("Only protocol zero is supported")
# We create a connected TCP socket. Note the trick with
# setblocking(False) that prevents us from having to create a thread.
lsock = socket.socket(family, type, proto)
try:
lsock.bind((host, 0))
lsock.listen(min(socket.SOMAXCONN, 128))
# On IPv6, ignore flow_info and scope_id
addr, port = lsock.getsockname()[:2]
csock = socket.socket(family, type, proto)
try:
csock.setblocking(False)
if sys.version_info >= (3, 0):
try:
csock.connect((addr, port))
except (BlockingIOError, InterruptedError):
pass
else:
try:
csock.connect((addr, port))
except socket.error as e:
if e.errno != errno.WSAEWOULDBLOCK:
raise
csock.setblocking(True)
ssock, _ = lsock.accept()
except:
csock.close()
raise
finally:
lsock.close()
return (ssock, csock)
socket.socketpair = socketpair
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