Create a pipe, which consists of two PAIR sockets connected over inproc.
The pipe is configured to use the zsys_pipehwm setting. Returns the
frontend socket successful, NULL if failed.

def create_pipe(backend_p):
        """
        Create a pipe, which consists of two PAIR sockets connected over inproc.
The pipe is configured to use the zsys_pipehwm setting. Returns the
frontend socket successful, NULL if failed.
        """
        return Zsock(lib.zsys_create_pipe(byref(zsock_p.from_param(backend_p))), False)