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ngx_config.h
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ngx_config.h
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// annotated by chrono since 2016
//
// * ngx_random
// * NGX_ALIGNMENT
// * ngx_align
// * ngx_align_ptr
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#ifndef _NGX_CONFIG_H_INCLUDED_
#define _NGX_CONFIG_H_INCLUDED_
#include <ngx_auto_headers.h>
#if defined __DragonFly__ && !defined __FreeBSD__
#define __FreeBSD__ 4
#define __FreeBSD_version 480101
#endif
#if (NGX_FREEBSD)
#include <ngx_freebsd_config.h>
#elif (NGX_LINUX)
#include <ngx_linux_config.h>
#elif (NGX_SOLARIS)
#include <ngx_solaris_config.h>
#elif (NGX_DARWIN)
#include <ngx_darwin_config.h>
#elif (NGX_WIN32)
#include <ngx_win32_config.h>
#else /* POSIX */
#include <ngx_posix_config.h>
#endif
#ifndef NGX_HAVE_SO_SNDLOWAT
#define NGX_HAVE_SO_SNDLOWAT 1
#endif
// 非win32，即unix
#if !(NGX_WIN32)
// 拼接宏
#define ngx_signal_helper(n) SIG##n
#define ngx_signal_value(n) ngx_signal_helper(n)
// 产生随机数
// 种子在ngx_worker_process_init里初始化
// srandom(((unsigned) ngx_pid << 16) ^ tp->sec ^ tp->msec);
#define ngx_random random
// 重定义unix信号，名字更易读
/* TODO: #ifndef */
#define NGX_SHUTDOWN_SIGNAL QUIT
#define NGX_TERMINATE_SIGNAL TERM
#define NGX_NOACCEPT_SIGNAL WINCH
#define NGX_RECONFIGURE_SIGNAL HUP
#if (NGX_LINUXTHREADS)
#define NGX_REOPEN_SIGNAL INFO
#define NGX_CHANGEBIN_SIGNAL XCPU
#else
#define NGX_REOPEN_SIGNAL USR1
#define NGX_CHANGEBIN_SIGNAL USR2
#endif
#define ngx_cdecl
#define ngx_libc_cdecl
#endif
// nginx内部标准整数定义
// ngx_rbtree_key_t = ngx_uint_t (ngx_rbtree.h)
// ngx_rbtree_key_int_t = ngx_int_t(ngx_rbtree.h)
// ngx_msec_t = ngx_rbtree_key_t = ngx_uint_t (ngx_time.h)
// ngx_msec_int_t = ngx_rbtree_key_int_t ngx_int_t(ngx_time.h)
typedef intptr_t ngx_int_t; //有符号整数
typedef uintptr_t ngx_uint_t; //无符号整数
typedef intptr_t ngx_flag_t; //相当于bool，标志量用
// 整数的字符串形式长度
#define NGX_INT32_LEN (sizeof("-2147483648") - 1)
#define NGX_INT64_LEN (sizeof("-9223372036854775808") - 1)
// 指针长度是4字节，32位cpu
#if (NGX_PTR_SIZE == 4)
#define NGX_INT_T_LEN NGX_INT32_LEN
#define NGX_MAX_INT_T_VALUE 2147483647
#else
// 指针长度是8字节，64位cpu
#define NGX_INT_T_LEN NGX_INT64_LEN
#define NGX_MAX_INT_T_VALUE 9223372036854775807
#endif
// 分配内存时的字节对齐
// 长整型，64位上是8字节
#ifndef NGX_ALIGNMENT
#define NGX_ALIGNMENT sizeof(unsigned long) /* platform word */
#endif
// 计算字节对齐的宏
// 上对齐到a的倍数，a是2的幂
#define ngx_align(d, a) (((d) + (a - 1)) & ~(a - 1))
// 指针上对齐到a的倍数
#define ngx_align_ptr(p, a) \
(u_char *) (((uintptr_t) (p) + ((uintptr_t) a - 1)) & ~((uintptr_t) a - 1))
#define ngx_abort abort
/* TODO: platform specific: array[NGX_INVALID_ARRAY_INDEX] must cause SIGSEGV */
#define NGX_INVALID_ARRAY_INDEX 0x80000000
// ngx_inline通常需要配合static使用
// 在nginx unit里的定义是：
// static inline __attribute__((always_inline))
/* TODO: auto_conf: ngx_inline inline __inline __inline__ */
#ifndef ngx_inline
#define ngx_inline inline
#endif
#ifndef INADDR_NONE /* Solaris */
#define INADDR_NONE ((unsigned int) -1)
#endif
#ifdef MAXHOSTNAMELEN
#define NGX_MAXHOSTNAMELEN MAXHOSTNAMELEN
#else
#define NGX_MAXHOSTNAMELEN 256
#endif
#define NGX_MAX_UINT32_VALUE (uint32_t) 0xffffffff
#define NGX_MAX_INT32_VALUE (uint32_t) 0x7fffffff
#if (NGX_COMPAT)
#define NGX_COMPAT_BEGIN(slots) uint64_t spare[slots];
#define NGX_COMPAT_END
#else
#define NGX_COMPAT_BEGIN(slots)
#define NGX_COMPAT_END
#endif
#endif /* _NGX_CONFIG_H_INCLUDED_ */