text: 
  /*
   * Copyright (C) Igor Sysoev
   * Copyright (C) Maxim Dounin
   * Copyright (C) Nginx, Inc.
   */
  
  
  #ifndef _NGX_MODULE_H_INCLUDED_
  #define _NGX_MODULE_H_INCLUDED_
  
  
  #include <ngx_config.h>
  #include <ngx_core.h>
  #include <nginx.h>
  
  
  #define NGX_MODULE_UNSET_INDEX  (ngx_uint_t) -1
  
  
  #define NGX_MODULE_SIGNATURE_0                                                \
      ngx_value(NGX_PTR_SIZE) ","                                               \
      ngx_value(NGX_SIG_ATOMIC_T_SIZE) ","                                      \
      ngx_value(NGX_TIME_T_SIZE) ","
  
  #if (NGX_HAVE_KQUEUE)
  #define NGX_MODULE_SIGNATURE_1   "1"
  #else
  #define NGX_MODULE_SIGNATURE_1   "0"
  #endif
  
  #if (NGX_HAVE_IOCP)
  #define NGX_MODULE_SIGNATURE_2   "1"
  #else
  #define NGX_MODULE_SIGNATURE_2   "0"
  #endif
  
  #if (NGX_HAVE_FILE_AIO || NGX_COMPAT)
  #define NGX_MODULE_SIGNATURE_3   "1"
  #else
  #define NGX_MODULE_SIGNATURE_3   "0"
  #endif
  
  #if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
  #define NGX_MODULE_SIGNATURE_4   "1"
  #else
  #define NGX_MODULE_SIGNATURE_4   "0"
  #endif
  
  #if (NGX_HAVE_EVENTFD)
  #define NGX_MODULE_SIGNATURE_5   "1"
  #else
  #define NGX_MODULE_SIGNATURE_5   "0"
  #endif
  
  #if (NGX_HAVE_EPOLL)
  #define NGX_MODULE_SIGNATURE_6   "1"
  #else
  #define NGX_MODULE_SIGNATURE_6   "0"
  #endif
  
  #if (NGX_HAVE_KEEPALIVE_TUNABLE)
  #define NGX_MODULE_SIGNATURE_7   "1"
  #else
  #define NGX_MODULE_SIGNATURE_7   "0"
  #endif
  
  #if (NGX_HAVE_INET6)
  #define NGX_MODULE_SIGNATURE_8   "1"
  #else
  #define NGX_MODULE_SIGNATURE_8   "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE_9   "1"
  #define NGX_MODULE_SIGNATURE_10  "1"
  
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
  #define NGX_MODULE_SIGNATURE_11  "1"
  #else
  #define NGX_MODULE_SIGNATURE_11  "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE_12  "1"
  
  #if (NGX_HAVE_SETFIB)
  #define NGX_MODULE_SIGNATURE_13  "1"
  #else
  #define NGX_MODULE_SIGNATURE_13  "0"
  #endif
  
  #if (NGX_HAVE_TCP_FASTOPEN)
  #define NGX_MODULE_SIGNATURE_14  "1"
  #else
  #define NGX_MODULE_SIGNATURE_14  "0"
  #endif
  
  #if (NGX_HAVE_UNIX_DOMAIN)
  #define NGX_MODULE_SIGNATURE_15  "1"
  #else
  #define NGX_MODULE_SIGNATURE_15  "0"
  #endif
  
  #if (NGX_HAVE_VARIADIC_MACROS)
  #define NGX_MODULE_SIGNATURE_16  "1"
  #else
  #define NGX_MODULE_SIGNATURE_16  "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE_17  "0"
  #define NGX_MODULE_SIGNATURE_18  "0"
  
  #if (NGX_HAVE_OPENAT)
  #define NGX_MODULE_SIGNATURE_19  "1"
  #else
  #define NGX_MODULE_SIGNATURE_19  "0"
  #endif
  
  #if (NGX_HAVE_ATOMIC_OPS)
  #define NGX_MODULE_SIGNATURE_20  "1"
  #else
  #define NGX_MODULE_SIGNATURE_20  "0"
  #endif
  
  #if (NGX_HAVE_POSIX_SEM)
  #define NGX_MODULE_SIGNATURE_21  "1"
  #else
  #define NGX_MODULE_SIGNATURE_21  "0"
  #endif
  
  #if (NGX_THREADS || NGX_COMPAT)
  #define NGX_MODULE_SIGNATURE_22  "1"
  #else
  #define NGX_MODULE_SIGNATURE_22  "0"
  #endif
  
  #if (NGX_PCRE)
  #define NGX_MODULE_SIGNATURE_23  "1"
  #else
  #define NGX_MODULE_SIGNATURE_23  "0"
  #endif
  
  #if (NGX_HTTP_SSL || NGX_COMPAT)
  #define NGX_MODULE_SIGNATURE_24  "1"
  #else
  #define NGX_MODULE_SIGNATURE_24  "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE_25  "1"
  
  #if (NGX_HTTP_GZIP)
  #define NGX_MODULE_SIGNATURE_26  "1"
  #else
  #define NGX_MODULE_SIGNATURE_26  "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE_27  "1"
  
  #if (NGX_HTTP_X_FORWARDED_FOR)
  #define NGX_MODULE_SIGNATURE_28  "1"
  #else
  #define NGX_MODULE_SIGNATURE_28  "0"
  #endif
  
  #if (NGX_HTTP_REALIP)
  #define NGX_MODULE_SIGNATURE_29  "1"
  #else
  #define NGX_MODULE_SIGNATURE_29  "0"
  #endif
  
  #if (NGX_HTTP_HEADERS)
  #define NGX_MODULE_SIGNATURE_30  "1"
  #else
  #define NGX_MODULE_SIGNATURE_30  "0"
  #endif
  
  #if (NGX_HTTP_DAV)
  #define NGX_MODULE_SIGNATURE_31  "1"
  #else
  #define NGX_MODULE_SIGNATURE_31  "0"
  #endif
  
  #if (NGX_HTTP_CACHE)
  #define NGX_MODULE_SIGNATURE_32  "1"
  #else
  #define NGX_MODULE_SIGNATURE_32  "0"
  #endif
  
  #if (NGX_HTTP_UPSTREAM_ZONE)
  #define NGX_MODULE_SIGNATURE_33  "1"
  #else
  #define NGX_MODULE_SIGNATURE_33  "0"
  #endif
  
  #if (NGX_COMPAT)
  #define NGX_MODULE_SIGNATURE_34  "1"
  #else
  #define NGX_MODULE_SIGNATURE_34  "0"
  #endif
  
  #define NGX_MODULE_SIGNATURE                                                  \
      NGX_MODULE_SIGNATURE_0 NGX_MODULE_SIGNATURE_1 NGX_MODULE_SIGNATURE_2      \
      NGX_MODULE_SIGNATURE_3 NGX_MODULE_SIGNATURE_4 NGX_MODULE_SIGNATURE_5      \
      NGX_MODULE_SIGNATURE_6 NGX_MODULE_SIGNATURE_7 NGX_MODULE_SIGNATURE_8      \
      NGX_MODULE_SIGNATURE_9 NGX_MODULE_SIGNATURE_10 NGX_MODULE_SIGNATURE_11    \
      NGX_MODULE_SIGNATURE_12 NGX_MODULE_SIGNATURE_13 NGX_MODULE_SIGNATURE_14   \
      NGX_MODULE_SIGNATURE_15 NGX_MODULE_SIGNATURE_16 NGX_MODULE_SIGNATURE_17   \
      NGX_MODULE_SIGNATURE_18 NGX_MODULE_SIGNATURE_19 NGX_MODULE_SIGNATURE_20   \
      NGX_MODULE_SIGNATURE_21 NGX_MODULE_SIGNATURE_22 NGX_MODULE_SIGNATURE_23   \
      NGX_MODULE_SIGNATURE_24 NGX_MODULE_SIGNATURE_25 NGX_MODULE_SIGNATURE_26   \
      NGX_MODULE_SIGNATURE_27 NGX_MODULE_SIGNATURE_28 NGX_MODULE_SIGNATURE_29   \
      NGX_MODULE_SIGNATURE_30 NGX_MODULE_SIGNATURE_31 NGX_MODULE_SIGNATURE_32   \
      NGX_MODULE_SIGNATURE_33 NGX_MODULE_SIGNATURE_34
  
  
  #define NGX_MODULE_V1                                                         \
      NGX_MODULE_UNSET_INDEX, NGX_MODULE_UNSET_INDEX,                           \
      NULL, 0, 0, nginx_version, NGX_MODULE_SIGNATURE
  
  #define NGX_MODULE_V1_PADDING  0, 0, 0, 0, 0, 0, 0, 0
  
  
  struct ngx_module_s {
      ngx_uint_t            ctx_index;
      ngx_uint_t            index;
  
      char                 *name;
  
      ngx_uint_t            spare0;
      ngx_uint_t            spare1;
  
      ngx_uint_t            version;
      const char           *signature;
  
      void                 *ctx;
      ngx_command_t        *commands;
      ngx_uint_t            type;
  
      ngx_int_t           (*init_master)(ngx_log_t *log);
  
      ngx_int_t           (*init_module)(ngx_cycle_t *cycle);
  
      ngx_int_t           (*init_process)(ngx_cycle_t *cycle);
      ngx_int_t           (*init_thread)(ngx_cycle_t *cycle);
      void                (*exit_thread)(ngx_cycle_t *cycle);
      void                (*exit_process)(ngx_cycle_t *cycle);
  
      void                (*exit_master)(ngx_cycle_t *cycle);
  
      uintptr_t             spare_hook0;
      uintptr_t             spare_hook1;
      uintptr_t             spare_hook2;
      uintptr_t             spare_hook3;
      uintptr_t             spare_hook4;
      uintptr_t             spare_hook5;
      uintptr_t             spare_hook6;
      uintptr_t             spare_hook7;
  };
  
  
  typedef struct {
      /* 核心模块名称 */
      ngx_str_t             name;
      /* 解析配置项前， Nginx 框架会调用 create_conf 方法。*/
      void               *(*create_conf)(ngx_cycle_t *cycle);
      /* 解析配置项完成后， Nginx 框架会调用 init_conf 方法。*/
      char               *(*init_conf)(ngx_cycle_t *cycle, void *conf);
  } ngx_core_module_t;
  
  
  ngx_int_t ngx_preinit_modules(void);
  ngx_int_t ngx_cycle_modules(ngx_cycle_t *cycle);
  ngx_int_t ngx_init_modules(ngx_cycle_t *cycle);
  ngx_int_t ngx_count_modules(ngx_cycle_t *cycle, ngx_uint_t type);
  
  
  ngx_int_t ngx_add_module(ngx_conf_t *cf, ngx_str_t *file,
      ngx_module_t *module, char **order);
  
  
  extern ngx_module_t  *ngx_modules[];
  extern ngx_uint_t     ngx_max_module;
  
  extern char          *ngx_module_names[];
  
  
  #endif /* _NGX_MODULE_H_INCLUDED_ */
  