File io 如何正确使用ngx_write_chain_到_temp_文件？

我正在编写nginx模块，该模块构造nginx链，然后将该链缓冲区写入nginx临时文件，以便稍后使用（就在写入发生之后）。我一直在搜索每一页，唯一的解决方案是下面的一个：

// Create temp file to test
            ngx_temp_file_t *tf;
            tf = ngx_pcalloc(r->pool, sizeof (ngx_temp_file_t));
            if (tf == NULL) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }
            tf->file.fd = NGX_INVALID_FILE;
            tf->file.log = nlog;
            tf->path = clcf->client_body_temp_path;
            tf->pool = r->pool;
            tf->log_level = r->request_body_file_log_level;
            tf->persistent = r->request_body_in_persistent_file;
            tf->clean = r->request_body_in_clean_file;
            //        if (r->request_body_file_group_access) {
            //            tf->access = 0660;
            //        }
            if (ngx_create_temp_file(&tf->file, tf->path, tf->pool, tf->persistent, tf->clean, tf->access) != NGX_OK) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            if (ngx_write_chain_to_temp_file(tf, bucket->first) == NGX_ERROR) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

此代码不返回NGX_错误，这是否意味着nginx成功地将临时文件写入客户端_body_temporay_路径？答案是肯定的，之后，我用fopen打开文件，文件不存在吗

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有人能给我一个正确的解决方案来处理ngx文件吗？

我找到了解决方案

        ngx_temp_file_t *tf;
        tf = ngx_pcalloc(r->pool, sizeof (ngx_temp_file_t));
        tf->file.fd = NGX_INVALID_FILE;
        tf->file.log = nlog;
        tf->path = clcf->client_body_temp_path;
        tf->pool = r->pool;
        tf->persistent = 1;
        rc = ngx_create_temp_file(&tf->file, tf->path, tf->pool, tf->persistent, tf->clean, tf->access);
        //ngx_write_chain_to_file(&tf->file, bucket->first, bucket->content_length, r->pool);
        ngx_write_chain_to_temp_file(tf, bucket->first);

我唯一不能理解的是，如果我将

tf->persistent

设置为false（0），那么在创建文件之后，即使我还没有将响应传递给output\u filter，我也无法从中读取