nginx几个重要的头文件

在分析nginx源代码时，我们看到几乎所有的源文件都会首先包含ngx_config.h，ngx_core.h这两个头文件。这两个头文件又包含一些其他头文件，其他头文件我们主要会介绍ngx_linux_config.h,ngx_auto_headers.h和ngx_auto_config.h这三个。按头文件包含由里到外的顺序为：

ngx_auto_config.h (ngx_auto_headers.h)
ngx_linux_config.h
ngx_config.h
ngx_core.h

如下我们也按这个顺序来进行介绍。

1. ngx_auto_config.h头文件

ngx_auto_config.h头文件是我们在配置编译时生成的，我们在这里在此列出以作参考：

#define NGX_CONFIGURE " --sbin-path=/usr/local/nginx/nginx --conf-path=/usr/local/nginx/nginx.conf --pid-path=/usr/local/nginx/nginx.pid --with-http_ssl_module --with-pcre=../pcre-8.40 --with-zlib=../zlib-1.2.11"

#ifndef NGX_COMPILER
#define NGX_COMPILER  "gcc 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) "
#endif


#ifndef NGX_HAVE_GCC_ATOMIC
#define NGX_HAVE_GCC_ATOMIC  1
#endif


#ifndef NGX_HAVE_C99_VARIADIC_MACROS
#define NGX_HAVE_C99_VARIADIC_MACROS  1
#endif


#ifndef NGX_HAVE_GCC_VARIADIC_MACROS
#define NGX_HAVE_GCC_VARIADIC_MACROS  1
#endif


#ifndef NGX_HAVE_GCC_BSWAP64
#define NGX_HAVE_GCC_BSWAP64  1
#endif


#ifndef NGX_HAVE_EPOLL
#define NGX_HAVE_EPOLL  1
#endif


#ifndef NGX_HAVE_CLEAR_EVENT
#define NGX_HAVE_CLEAR_EVENT  1
#endif


#ifndef NGX_HAVE_EPOLLRDHUP
#define NGX_HAVE_EPOLLRDHUP  1
#endif


#ifndef NGX_HAVE_O_PATH
#define NGX_HAVE_O_PATH  1
#endif


#ifndef NGX_HAVE_SENDFILE
#define NGX_HAVE_SENDFILE  1
#endif


#ifndef NGX_HAVE_SENDFILE64
#define NGX_HAVE_SENDFILE64  1
#endif


#ifndef NGX_HAVE_PR_SET_DUMPABLE
#define NGX_HAVE_PR_SET_DUMPABLE  1
#endif


#ifndef NGX_HAVE_SCHED_SETAFFINITY
#define NGX_HAVE_SCHED_SETAFFINITY  1
#endif


#ifndef NGX_HAVE_GNU_CRYPT_R
#define NGX_HAVE_GNU_CRYPT_R  1
#endif


#ifndef NGX_HAVE_NONALIGNED
#define NGX_HAVE_NONALIGNED  1
#endif


#ifndef NGX_CPU_CACHE_LINE
#define NGX_CPU_CACHE_LINE  32
#endif


#define NGX_KQUEUE_UDATA_T  (void *)


#ifndef NGX_HAVE_POSIX_FADVISE
#define NGX_HAVE_POSIX_FADVISE  1
#endif


#ifndef NGX_HAVE_O_DIRECT
#define NGX_HAVE_O_DIRECT  1
#endif


#ifndef NGX_HAVE_ALIGNED_DIRECTIO
#define NGX_HAVE_ALIGNED_DIRECTIO  1
#endif


#ifndef NGX_HAVE_STATFS
#define NGX_HAVE_STATFS  1
#endif


#ifndef NGX_HAVE_STATVFS
#define NGX_HAVE_STATVFS  1
#endif


#ifndef NGX_HAVE_DLOPEN
#define NGX_HAVE_DLOPEN  1
#endif


#ifndef NGX_HAVE_SCHED_YIELD
#define NGX_HAVE_SCHED_YIELD  1
#endif


#ifndef NGX_HAVE_REUSEPORT
#define NGX_HAVE_REUSEPORT  1
#endif


#ifndef NGX_HAVE_IP_PKTINFO
#define NGX_HAVE_IP_PKTINFO  1
#endif


#ifndef NGX_HAVE_IPV6_RECVPKTINFO
#define NGX_HAVE_IPV6_RECVPKTINFO  1
#endif


#ifndef NGX_HAVE_DEFERRED_ACCEPT
#define NGX_HAVE_DEFERRED_ACCEPT  1
#endif


#ifndef NGX_HAVE_KEEPALIVE_TUNABLE
#define NGX_HAVE_KEEPALIVE_TUNABLE  1
#endif


#ifndef NGX_HAVE_TCP_FASTOPEN
#define NGX_HAVE_TCP_FASTOPEN  1
#endif


#ifndef NGX_HAVE_TCP_INFO
#define NGX_HAVE_TCP_INFO  1
#endif


#ifndef NGX_HAVE_ACCEPT4
#define NGX_HAVE_ACCEPT4  1
#endif


#ifndef NGX_HAVE_EVENTFD
#define NGX_HAVE_EVENTFD  1
#endif


#ifndef NGX_HAVE_SYS_EVENTFD_H
#define NGX_HAVE_SYS_EVENTFD_H  1
#endif


#ifndef NGX_HAVE_UNIX_DOMAIN
#define NGX_HAVE_UNIX_DOMAIN  1
#endif


#ifndef NGX_PTR_SIZE
#define NGX_PTR_SIZE  4
#endif


#ifndef NGX_SIG_ATOMIC_T_SIZE
#define NGX_SIG_ATOMIC_T_SIZE  4
#endif


#ifndef NGX_HAVE_LITTLE_ENDIAN
#define NGX_HAVE_LITTLE_ENDIAN  1
#endif


#ifndef NGX_MAX_SIZE_T_VALUE
#define NGX_MAX_SIZE_T_VALUE  2147483647
#endif


#ifndef NGX_SIZE_T_LEN
#define NGX_SIZE_T_LEN  (sizeof("-2147483648") - 1)
#endif


#ifndef NGX_MAX_OFF_T_VALUE
#define NGX_MAX_OFF_T_VALUE  9223372036854775807LL
#endif


#ifndef NGX_OFF_T_LEN
#define NGX_OFF_T_LEN  (sizeof("-9223372036854775808") - 1)
#endif


#ifndef NGX_TIME_T_SIZE
#define NGX_TIME_T_SIZE  4
#endif


#ifndef NGX_TIME_T_LEN
#define NGX_TIME_T_LEN  (sizeof("-2147483648") - 1)
#endif


#ifndef NGX_MAX_TIME_T_VALUE
#define NGX_MAX_TIME_T_VALUE  2147483647
#endif


#ifndef NGX_HAVE_PREAD
#define NGX_HAVE_PREAD  1
#endif


#ifndef NGX_HAVE_PWRITE
#define NGX_HAVE_PWRITE  1
#endif


#ifndef NGX_HAVE_PWRITEV
#define NGX_HAVE_PWRITEV  1
#endif


#ifndef NGX_SYS_NERR
#define NGX_SYS_NERR  135
#endif


#ifndef NGX_HAVE_LOCALTIME_R
#define NGX_HAVE_LOCALTIME_R  1
#endif


#ifndef NGX_HAVE_POSIX_MEMALIGN
#define NGX_HAVE_POSIX_MEMALIGN  1
#endif


#ifndef NGX_HAVE_MEMALIGN
#define NGX_HAVE_MEMALIGN  1
#endif


#ifndef NGX_HAVE_MAP_ANON
#define NGX_HAVE_MAP_ANON  1
#endif


#ifndef NGX_HAVE_MAP_DEVZERO
#define NGX_HAVE_MAP_DEVZERO  1
#endif


#ifndef NGX_HAVE_SYSVSHM
#define NGX_HAVE_SYSVSHM  1
#endif


#ifndef NGX_HAVE_POSIX_SEM
#define NGX_HAVE_POSIX_SEM  1
#endif


#ifndef NGX_HAVE_MSGHDR_MSG_CONTROL
#define NGX_HAVE_MSGHDR_MSG_CONTROL  1
#endif


#ifndef NGX_HAVE_FIONBIO
#define NGX_HAVE_FIONBIO  1
#endif


#ifndef NGX_HAVE_GMTOFF
#define NGX_HAVE_GMTOFF  1
#endif


#ifndef NGX_HAVE_D_TYPE
#define NGX_HAVE_D_TYPE  1
#endif


#ifndef NGX_HAVE_SC_NPROCESSORS_ONLN
#define NGX_HAVE_SC_NPROCESSORS_ONLN  1
#endif


#ifndef NGX_HAVE_OPENAT
#define NGX_HAVE_OPENAT  1
#endif


#ifndef NGX_HAVE_GETADDRINFO
#define NGX_HAVE_GETADDRINFO  1
#endif


#ifndef NGX_HTTP_CACHE
#define NGX_HTTP_CACHE  1
#endif


#ifndef NGX_HTTP_GZIP
#define NGX_HTTP_GZIP  1
#endif


#ifndef NGX_HTTP_SSI
#define NGX_HTTP_SSI  1
#endif


#ifndef NGX_CRYPT
#define NGX_CRYPT  1
#endif


#ifndef NGX_HTTP_X_FORWARDED_FOR
#define NGX_HTTP_X_FORWARDED_FOR  1
#endif


#ifndef NGX_HTTP_SSL
#define NGX_HTTP_SSL  1
#endif


#ifndef NGX_HTTP_X_FORWARDED_FOR
#define NGX_HTTP_X_FORWARDED_FOR  1
#endif


#ifndef NGX_HTTP_UPSTREAM_ZONE
#define NGX_HTTP_UPSTREAM_ZONE  1
#endif


#ifndef NGX_PCRE
#define NGX_PCRE  1
#endif


#ifndef NGX_OPENSSL
#define NGX_OPENSSL  1
#endif


#ifndef NGX_SSL
#define NGX_SSL  1
#endif


#ifndef NGX_HAVE_OPENSSL_MD5_H
#define NGX_HAVE_OPENSSL_MD5_H  1
#endif


#ifndef NGX_OPENSSL_MD5
#define NGX_OPENSSL_MD5  1
#endif


#ifndef NGX_HAVE_MD5
#define NGX_HAVE_MD5  1
#endif


#ifndef NGX_HAVE_OPENSSL_SHA1_H
#define NGX_HAVE_OPENSSL_SHA1_H  1
#endif


#ifndef NGX_HAVE_SHA1
#define NGX_HAVE_SHA1  1
#endif


#ifndef NGX_ZLIB
#define NGX_ZLIB  1
#endif


#ifndef NGX_PREFIX
#define NGX_PREFIX  "/usr/local/nginx/"
#endif


#ifndef NGX_CONF_PREFIX
#define NGX_CONF_PREFIX  "/usr/local/nginx/"
#endif


#ifndef NGX_SBIN_PATH
#define NGX_SBIN_PATH  "/usr/local/nginx/nginx"
#endif


#ifndef NGX_CONF_PATH
#define NGX_CONF_PATH  "/usr/local/nginx/nginx.conf"
#endif


#ifndef NGX_PID_PATH
#define NGX_PID_PATH  "/usr/local/nginx/nginx.pid"
#endif


#ifndef NGX_LOCK_PATH
#define NGX_LOCK_PATH  "logs/nginx.lock"
#endif


#ifndef NGX_ERROR_LOG_PATH
#define NGX_ERROR_LOG_PATH  "logs/error.log"
#endif


#ifndef NGX_HTTP_LOG_PATH
#define NGX_HTTP_LOG_PATH  "logs/access.log"
#endif


#ifndef NGX_HTTP_CLIENT_TEMP_PATH
#define NGX_HTTP_CLIENT_TEMP_PATH  "client_body_temp"
#endif


#ifndef NGX_HTTP_PROXY_TEMP_PATH
#define NGX_HTTP_PROXY_TEMP_PATH  "proxy_temp"
#endif


#ifndef NGX_HTTP_FASTCGI_TEMP_PATH
#define NGX_HTTP_FASTCGI_TEMP_PATH  "fastcgi_temp"
#endif


#ifndef NGX_HTTP_UWSGI_TEMP_PATH
#define NGX_HTTP_UWSGI_TEMP_PATH  "uwsgi_temp"
#endif


#ifndef NGX_HTTP_SCGI_TEMP_PATH
#define NGX_HTTP_SCGI_TEMP_PATH  "scgi_temp"
#endif


#ifndef NGX_SUPPRESS_WARN
#define NGX_SUPPRESS_WARN  1
#endif


#ifndef NGX_SMP
#define NGX_SMP  1
#endif


#ifndef NGX_USER
#define NGX_USER  "nobody"
#endif


#ifndef NGX_GROUP
#define NGX_GROUP  "nogroup"
#endif

ngx_auto_config.h基本上在执行configure脚本时根据当前操作系统的特性所产生的一些配置。

2. ngx_auto_headers.h头文件

ngx_auto_headers.h头文件是在执行configure脚本时产生的，主要是检测当前操作系统所支持的一些头文件：

#ifndef NGX_HAVE_UNISTD_H
#define NGX_HAVE_UNISTD_H  1
#endif


#ifndef NGX_HAVE_INTTYPES_H
#define NGX_HAVE_INTTYPES_H  1
#endif


#ifndef NGX_HAVE_LIMITS_H
#define NGX_HAVE_LIMITS_H  1
#endif


#ifndef NGX_HAVE_SYS_PARAM_H
#define NGX_HAVE_SYS_PARAM_H  1
#endif


#ifndef NGX_HAVE_SYS_MOUNT_H
#define NGX_HAVE_SYS_MOUNT_H  1
#endif


#ifndef NGX_HAVE_SYS_STATVFS_H
#define NGX_HAVE_SYS_STATVFS_H  1
#endif


#ifndef NGX_HAVE_CRYPT_H
#define NGX_HAVE_CRYPT_H  1
#endif


#ifndef NGX_LINUX
#define NGX_LINUX  1
#endif


#ifndef NGX_HAVE_SYS_PRCTL_H
#define NGX_HAVE_SYS_PRCTL_H  1
#endif


#ifndef NGX_HAVE_SYS_VFS_H
#define NGX_HAVE_SYS_VFS_H  1
#endif

3. os/unix/ngx_linux_config.h头文件

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_LINUX_CONFIG_H_INCLUDED_
#define _NGX_LINUX_CONFIG_H_INCLUDED_


#ifndef _GNU_SOURCE
#define _GNU_SOURCE             /* pread(), pwrite(), gethostname() */
#endif

#define _FILE_OFFSET_BITS  64

#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>             /* offsetof() */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <dirent.h>
#include <glob.h>
#include <sys/vfs.h>            /* statfs() */

#include <sys/uio.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sched.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>        /* TCP_NODELAY, TCP_CORK */
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/un.h>

#include <time.h>               /* tzset() */
#include <malloc.h>             /* memalign() */
#include <limits.h>             /* IOV_MAX */
#include <sys/ioctl.h>
#include <crypt.h>
#include <sys/utsname.h>        /* uname() */

#include <dlfcn.h>


#include <ngx_auto_config.h>


#if (NGX_HAVE_POSIX_SEM)
#include <semaphore.h>
#endif


#if (NGX_HAVE_SYS_PRCTL_H)
#include <sys/prctl.h>
#endif


#if (NGX_HAVE_SENDFILE64)
#include <sys/sendfile.h>
#else
extern ssize_t sendfile(int s, int fd, int32_t *offset, size_t size);
#define NGX_SENDFILE_LIMIT  0x80000000
#endif


#if (NGX_HAVE_POLL)
#include <poll.h>
#endif


#if (NGX_HAVE_EPOLL)
#include <sys/epoll.h>
#endif


#if (NGX_HAVE_SYS_EVENTFD_H)
#include <sys/eventfd.h>
#endif
#include <sys/syscall.h>
#if (NGX_HAVE_FILE_AIO)
#include <linux/aio_abi.h>
typedef struct iocb  ngx_aiocb_t;
#endif


#define NGX_LISTEN_BACKLOG        511


#ifndef NGX_HAVE_SO_SNDLOWAT
/* setsockopt(SO_SNDLOWAT) returns ENOPROTOOPT */
#define NGX_HAVE_SO_SNDLOWAT         0
#endif


#ifndef NGX_HAVE_INHERITED_NONBLOCK
#define NGX_HAVE_INHERITED_NONBLOCK  0
#endif


#define NGX_HAVE_OS_SPECIFIC_INIT    1
#define ngx_debug_init()


extern char **environ;


#endif /* _NGX_LINUX_CONFIG_H_INCLUDED_ */

如上我们看到ngx_linux_config.h头文件也是一个很基础的头文件，参照我们configure执行时的相应特性：

NGX_HAVE_POSIX_SEM：值为1
NGX_HAVE_SYS_PRCTL_H：值为1
NGX_HAVE_SENDFILE64：值为1
NGX_HAVE_POLL：没有定义，值为0
NGX_HAVE_EPOLL: 值为1
NGX_HAVE_SYS_EVENTFD_H: 值为1
NGX_HAVE_FILE_AIO：没有定义，值为0
NGX_HAVE_SO_SNDLOWAT: 没有定义
NGX_HAVE_INHERITED_NONBLOCK: 没有定义

extern char **environ其一般是定义在操作系统posix/environ.c中。该变量在我们可执行程序启动时操作系统就会自动为我们赋值。看如下测试程序test2.c:

#include <stdio.h>
#include <stdlib.h>


extern   char**environ;

int main(int argc,char *argv[])
{
        char **p = NULL;

        if (environ == NULL)
                printf("environ is NULL\n");
        else{
            for(p = environ; *p; p++)
            {
                printf("%s\n",*p);
            }
        }
        return 0x0;
}

编译运行：

[root@localhost test-src]# gcc -o test2 test2.c
[root@localhost test-src]# ./test2
XDG_SESSION_ID=23
HOSTNAME=localhost.localdomain
SELINUX_ROLE_REQUESTED=
TERM=vt100
SHELL=/bin/bash
HISTSIZE=1000
SSH_CLIENT=192.168.69.1 49180 22
SELINUX_USE_CURRENT_RANGE=
SSH_TTY=/dev/pts/2
JRE_HOME=/usr/java/jdk1.8.0_131/jre
USER=root
LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;   //此处部分删减
MAIL=/var/spool/mail/root
PATH=/usr/java/jdk1.8.0_131//bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
PWD=/root/test-src
JAVA_HOME=/usr/java/jdk1.8.0_131/
LANG=en_US.UTF-8
SELINUX_LEVEL_REQUESTED=
HISTCONTROL=ignoredups
SHLVL=1
HOME=/root
LOGNAME=root
CLASSPATH=/usr/java/jdk1.8.0_131//lib:/usr/java/jdk1.8.0_131/jre/lib:
SSH_CONNECTION=192.168.69.1 49180 192.168.69.128 22
PKG_CONFIG_PATH=:/usr/local/lib/pkgconfig/
LESSOPEN=||/usr/bin/lesspipe.sh %s
XDG_RUNTIME_DIR=/run/user/0
_=./test2
OLDPWD=/root

与我们直接调用如下命令得到的结果一致：

# env

4. core/ngx_config.h头文件

/*
 * 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


#if !(NGX_WIN32)

#define ngx_signal_helper(n)     SIG##n
#define ngx_signal_value(n)      ngx_signal_helper(n)

#define ngx_random               random

/* 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

typedef intptr_t        ngx_int_t;
typedef uintptr_t       ngx_uint_t;
typedef intptr_t        ngx_flag_t;


#define NGX_INT32_LEN   (sizeof("-2147483648") - 1)
#define NGX_INT64_LEN   (sizeof("-9223372036854775808") - 1)

#if (NGX_PTR_SIZE == 4)
#define NGX_INT_T_LEN   NGX_INT32_LEN
#define NGX_MAX_INT_T_VALUE  2147483647

#else
#define NGX_INT_T_LEN   NGX_INT64_LEN
#define NGX_MAX_INT_T_VALUE  9223372036854775807
#endif


#ifndef NGX_ALIGNMENT
#define NGX_ALIGNMENT   sizeof(unsigned long)    /* platform word */
#endif

#define ngx_align(d, a)     (((d) + (a - 1)) & ~(a - 1))
#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


/* 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


#endif /* _NGX_CONFIG_H_INCLUDED_ */

NGX_LINUX: 值为1
NGX_LINUXTHREADS：没有定义
NGX_PTR_SIZE：值为4
NGX_ALIGNMENT：没有定义

5. core/ngx_core.h头文件

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_CORE_H_INCLUDED_
#define _NGX_CORE_H_INCLUDED_


#include <ngx_config.h>


typedef struct ngx_module_s      ngx_module_t;
typedef struct ngx_conf_s        ngx_conf_t;
typedef struct ngx_cycle_s       ngx_cycle_t;
typedef struct ngx_pool_s        ngx_pool_t;
typedef struct ngx_chain_s       ngx_chain_t;
typedef struct ngx_log_s         ngx_log_t;
typedef struct ngx_open_file_s   ngx_open_file_t;
typedef struct ngx_command_s     ngx_command_t;
typedef struct ngx_file_s        ngx_file_t;
typedef struct ngx_event_s       ngx_event_t;
typedef struct ngx_event_aio_s   ngx_event_aio_t;
typedef struct ngx_connection_s  ngx_connection_t;

#if (NGX_THREADS)
typedef struct ngx_thread_task_s  ngx_thread_task_t;
#endif

typedef void (*ngx_event_handler_pt)(ngx_event_t *ev);
typedef void (*ngx_connection_handler_pt)(ngx_connection_t *c);


#define  NGX_OK          0
#define  NGX_ERROR      -1
#define  NGX_AGAIN      -2
#define  NGX_BUSY       -3
#define  NGX_DONE       -4
#define  NGX_DECLINED   -5
#define  NGX_ABORT      -6


#include <ngx_errno.h>
#include <ngx_atomic.h>
#include <ngx_thread.h>
#include <ngx_rbtree.h>
#include <ngx_time.h>
#include <ngx_socket.h>
#include <ngx_string.h>
#include <ngx_files.h>
#include <ngx_shmem.h>
#include <ngx_process.h>
#include <ngx_user.h>
#include <ngx_dlopen.h>
#include <ngx_parse.h>
#include <ngx_parse_time.h>
#include <ngx_log.h>
#include <ngx_alloc.h>
#include <ngx_palloc.h>
#include <ngx_buf.h>
#include <ngx_queue.h>
#include <ngx_array.h>
#include <ngx_list.h>
#include <ngx_hash.h>
#include <ngx_file.h>
#include <ngx_crc.h>
#include <ngx_crc32.h>
#include <ngx_murmurhash.h>
#if (NGX_PCRE)
#include <ngx_regex.h>
#endif
#include <ngx_radix_tree.h>
#include <ngx_times.h>
#include <ngx_rwlock.h>
#include <ngx_shmtx.h>
#include <ngx_slab.h>
#include <ngx_inet.h>
#include <ngx_cycle.h>
#include <ngx_resolver.h>
#if (NGX_OPENSSL)
#include <ngx_event_openssl.h>
#endif
#include <ngx_process_cycle.h>
#include <ngx_conf_file.h>
#include <ngx_module.h>
#include <ngx_open_file_cache.h>
#include <ngx_os.h>
#include <ngx_connection.h>
#include <ngx_syslog.h>
#include <ngx_proxy_protocol.h>


#define LF     (u_char) '\n'
#define CR     (u_char) '\r'
#define CRLF   "\r\n"


#define ngx_abs(value)       (((value) >= 0) ? (value) : - (value))
#define ngx_max(val1, val2)  ((val1 < val2) ? (val2) : (val1))
#define ngx_min(val1, val2)  ((val1 > val2) ? (val2) : (val1))

void ngx_cpuinfo(void);

#if (NGX_HAVE_OPENAT)
#define NGX_DISABLE_SYMLINKS_OFF        0
#define NGX_DISABLE_SYMLINKS_ON         1
#define NGX_DISABLE_SYMLINKS_NOTOWNER   2
#endif

#endif /* _NGX_CORE_H_INCLUDED_ */

NGX_THREADS: 没有定义
NGX_PCRE: 值为1
NGX_OPENSSL: 值为1
NGX_HAVE_OPENAT: 值为1

Ivanzz

发上等愿，结中等缘，享下等福；择高处立，寻平处住，向宽处行