Method writev

net/rsocket/rsocket.cpp:191–196

                                           0);
    }
    ssize_t writev(uint64_t timeout, const struct iovec* iov, int iovcnt) {
        iovector_view viov{(iovec*)iov, iovcnt};
        tmp_msg_hdr msg(viov);
        return do_io_fully_action<POLLOUT>(timeout, rsendmsg, viov.sum(), msg,
                                           0);
    }
    int shutdown(ShutdownHow how) {
        return rshutdown(fd, static_cast<int>(how));
    }