【nginx源码学习与运用】系列博客中的示例代码在csdn的代码托管服务器CODE上，地址https://code.csdn.net/u012819339/nginx_study ，你可以将其自由的下载到本地，或者通过Git来实时获取更新
步骤和前一篇博客类似，不再赘述，这里贴出代码，解释也在代码中
ngx_http_filetest_module.c源码如下：
//该示例代码演示如何发送磁盘中的文件 #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_http.h> #include <ngx_files.h> //文件描述符清理函数，nginx在处理完本次请求释放内存池的时候会同步调用该函数释放资源 void ngx_pool_cleanup_mytest_file(void *data) { ngx_pool_cleanup_file_t *c = data; ngx_close_file(c->fd); } static ngx_int_t ngx_http_filetest_handler(ngx_http_request_t *r) { //设定mytest模块只处理GET或HEAD请求 if(!(r->method &(NGX_HTTP_GET|NGX_HTTP_HEAD))) return NGX_HTTP_NOT_ALLOWED; //丢弃请求中的包体 ngx_int_t rc = ngx_http_discard_request_body(r); if(rc != NGX_OK) return rc; ngx_buf_t *b; b = ngx_palloc(r->pool, sizeof(ngx_buf_t)); u_char *filename = (u_char *)"/tmp/filetest.txt"; b->in_file = 1; b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)); b->file->fd = ngx_open_file(filename, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK, NGX_FILE_OPEN, 0); b->file->log = r->connection->log; b->file->name.data = filename; b->file->name.len = ngx_strlen(filename); if(b->file->fd <= 0) return NGX_HTTP_NOT_FOUND; if(ngx_file_info(filename, &b->file->info) == NGX_FILE_ERROR ) { ngx_close_file(b->file->fd); return NGX_HTTP_INTERNAL_SERVER_ERROR; } r->headers_out.content_length_n = b->file->info.st_size; b->file_pos = 0; b->file_last = b->file->info.st_size; //注册文件描述符清理函数 ngx_pool_cleanup_t *cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_pool_cleanup_file_t)); if(cln == NULL) { ngx_close_file(b->file->fd); return NGX_ERROR; } cln->handler = ngx_pool_cleanup_mytest_file; //需要自己实现的清理函数 ngx_pool_cleanup_file_t *clnf = cln->data; clnf->fd = b->file->fd; clnf->name = b->file->name.data; clnf->log = r->pool->log; ngx_str_t type = ngx_string("text/html"); r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_type = type; //发送HTTP头部 rc = ngx_http_send_header(r); if(rc == NGX_ERROR || rc > NGX_OK || r->header_only) { ngx_close_file(b->file->fd); return rc; } //发送body ngx_chain_t out; out.buf = b; out.next = NULL; //如果要支持断点续传就解注释下面语句 //r->allow_ranges = 1; return ngx_http_output_filter(r, &out); } static char *ngx_http_filetest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_core_loc_conf_t *clcf; clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); clcf->handler = ngx_http_filetest_handler; return NGX_CONF_OK; } static ngx_command_t ngx_http_filetest_commands[] = { { ngx_string("filetest"), NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS, ngx_http_filetest, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, ngx_null_command }; //模块接口描述的8个阶段，在http框架初始化的时候完成，函数指针都可置NULL static ngx_http_module_t ngx_http_filetest_module_ctx = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, }; ngx_module_t ngx_http_filetest_module = { NGX_MODULE_V1, &ngx_http_filetest_module_ctx, ngx_http_filetest_commands, NGX_HTTP_MODULE, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NGX_MODULE_V1_PADDING };添加filetest模块后的config文件：
ngx_addon_name="ngx_http_mytest_module ngx_http_filetest_module" HTTP_MODULES="$HTTP_MODULES ngx_http_mytest_module ngx_http_filetest_module" NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mytest_module.c $ngx_addon_dir/ngx_http_filetest_module.c"测试文件： 磁盘测试文件/tmp/filetest.txt内容如下：
<html> <head> <title>filetest</title> <head> <body> <p>arvik filetest module!</p> </body> </html>运行结果截图：
代码已经存上传到这个位置 https://code.csdn.net/u012819339/nginx_study ，在项目的test9目录中，童鞋们可自行下载演示
