[Nginx source code analysis] Main Function parsing, nginx source code

[Nginx source code analysis] Main Function parsing, nginx source code

Ngx_strerror_init

The function stores the error information in the ngx_sys_errlist array and creates a ing array of errno-> errmsg. When an error occurs in the system, you can directly find errmsg through errno, reduce api calls.

Ngx_get_options (argc, argv)

This function is mainly used to set some flag variables based on user input and save user input parameters.

Paramflag? /Hngx_show_version = 1/ngx_show_help = region = 1vngx_show_version = 1/ngx_show_configure = region = 1pngx_prefix = argv [index] supports-p/home/work/nginx or-p/home/ work/nginxcngx_conf_file = p support method same as gngx_conf_param = p support method same as sngx_signal = p/ngx_process = NGX_PROCESS_SIGNALLER (stop, quit, reopen, reload)

Ngx_time_init-> ngx_time_update

Update the following time by locking and unlocking:

variableformatngx_cached_time = tp;ngx_cached_http_time.data = p0;“Mon, 28 Sep 1970 06:00:00 GMT”ngx_cached_err_log_time.data = p1;“1970/09/28 12:00:00”ngx_cached_http_log_time.data = p2;“28/Sep/1970:12:00:00 +0600”ngx_cached_http_log_iso8601.data = p3        “1970-09-28T12:00:00+06:00”

Ngx_regex_init ()

It mainly sets two pcre global allocation and revocation functions.

Ngx_pid = getpid (); // Obtain the master process pid

Ngx_log_init (ngx_prefix)

# If (NGX_WIN32) if (name [1]! = ':') {# Else if (name [0]! = '/') {# Endif if (prefix) {plen = ngx_strlen (prefix ); // if the user inputs-p prefix} else {# ifdef NGX_PREFIX prefix = (u_char *) NGX_PREFIX; // if the user does not input it, use the configure path plen = ngx_strlen (prefix ); # else plen = 0; # endif} if (plen) {name = malloc (plen + nlen + 2); if (name = NULL) {return NULL ;} p = ngx_cpymem (name, prefix, plen); // copy prefix if (! Ngx_path_separator (* (p-1) {* p ++ = '/';} ngx_cpystrn (p, (u_char *) NGX_ERROR_LOG_PATH, nlen + 1 ); // copy path p = name ;}}

The final return value and the ngx_log constructed by the function

Ngx_log {ngx_log.file = & ngx_log_file; {ngx_fd_tfd; // The Error Log ngx_str_tname; // u_char * buffer is not set; // u_char * pos is not set; // u_char * last is not set; // not set} log_level = NGX_LOG_NOTICE ;}

Init_cycle.pool = ngx_create_pool (1024, log); // Allocate a memory pool node. The specific memory pool can be

For details, see the memory pool analysis document.

Ngx_save_argv

The function saves user input parameters in the ngx_argv array.

Ngx_process_options

This function is mainly used to process user input parameters, configuration files, test configuration files,

Conf_file =/home/work/hunter/nginx/nginx_gdb/conf/nginx. conf

Conf_prefix =/home/work/hunter/nginx/nginx_gdb/conf

Prefix =/home/work/hunter/nginx/nginx_gdb

 

Ngx_crc32_table_init () // initialize the crc table

// Set the module index for each module

ngx_max_module = 0;for (i = 0; ngx_modules[i]; i++) {ngx_modules[i]->index = ngx_max_module++;}

Analyze Configuration Analysis

Ngx_init_cycl ()