Function socketpair

crates/stdlib/src/socket.rs:3061–3075

(
        family: OptionalArg<i32>,
        socket_kind: OptionalArg<i32>,
        proto: OptionalArg<i32>,
    )

    #[cfg(unix)]
    #[pyfunction]
    fn socketpair(
        family: OptionalArg<i32>,
        socket_kind: OptionalArg<i32>,
        proto: OptionalArg<i32>,
    ) -> Result<(PySocket, PySocket), IoOrPyException> {
        let family = family.unwrap_or(libc::AF_UNIX);
        let socket_kind = socket_kind.unwrap_or(libc::SOCK_STREAM);
        let proto = proto.unwrap_or(0);
        let (a, b) = Socket::pair(family.into(), socket_kind.into(), Some(proto.into()))?;
        let py_a = PySocket::default();
        py_a.init_inner(family, socket_kind, proto, a)?;
        let py_b = PySocket::default();
        py_b.init_inner(family, socket_kind, proto, b)?;
        Ok((py_a, py_b))
    }

    #[cfg(all(unix, not(target_os = "redox")))]
    type IfIndex = c::c_uint;