Method writev

common/memory-stream/memory-stream.cpp:267–276

        return count;
    }
    virtual ssize_t writev(const struct iovec *iov, int iovcnt) override {
        ssize_t s = 0;
        for (int i = 0; i < iovcnt; ++i) {
            ssize_t ret = write(iov[i].iov_base, iov[i].iov_len);
            if (ret < 0) return ret;
            s += ret;
            if (ret < (ssize_t)iov[i].iov_len) break;
        }
        return s;
    }
    virtual Object* get_underlay_object(uint64_t recursion = 0) override { return 0; }
    virtual ssize_t sendfile(int in_fd, off_t offset, size_t count) override { ERROR_RETURN(ENOSYS, -1); }
    virtual int setsockopt(int level, int option_name, const void* option_value, socklen_t option_len) override { ERROR_RETURN(ENOSYS, -1); }