Function get_cid

Lib/test/test_socket.py:92–103

()

    return decorator

def get_cid():
    if fcntl is None:
        return None
    if not hasattr(socket, 'IOCTL_VM_SOCKETS_GET_LOCAL_CID'):
        return None
    try:
        with open("/dev/vsock", "rb") as f:
            r = fcntl.ioctl(f, socket.IOCTL_VM_SOCKETS_GET_LOCAL_CID, "    ")
    except OSError:
        return None
    else:
        return struct.unpack("I", r)[0]

def _have_socket_can():
    """Check whether CAN sockets are supported on this host."""