Method readv

net/kernel_socket.cpp:102–107

        return DOIO_LOOP(do_recv(fd, buf, count, 0, timeout), BufStep(buf, count));
    }
    ssize_t readv(const iovec* iov, int iovcnt) override {
        SmartCloneIOV<8> clone(iov, iovcnt);
        iovector_view view(clone.ptr, iovcnt);
        Timeout timeout(m_timeout);
        return DOIO_LOOP(do_recvmsg(fd, tmp_msg_hdr(view), 0, timeout), BufStepV(view));
    }
    ssize_t write(const void* buf, size_t count) override {
        Timeout timeout(m_timeout);
        return DOIO_LOOP(do_send(fd, buf, count, MSG_NOSIGNAL, timeout), BufStep((void*&)buf, count));