{"id":32825,"date":"2022-12-08T11:38:50","date_gmt":"2022-10-18T16:36:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/nginx%e6%ba%90%e4%bb%a3%e7%a0%81%e9%98%85%e8%af%bb-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-nginx%e5%90%af%e5%8a%a8\/"},"modified":"2024-01-15T07:31:42","modified_gmt":"2024-01-14T23:31:42","slug":"nginx%e6%ba%90%e4%bb%a3%e7%a0%81%e9%98%85%e8%af%bb-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-nginx%e5%90%af%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/nginx%e6%ba%90%e4%bb%a3%e7%a0%81%e9%98%85%e8%af%bb-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-nginx%e5%90%af%e5%8a%a8\/","title":{"rendered":"Nginx\u6e90\u4ee3\u7801\u9605\u8bfb \u7b2c\u4e00\u90e8\u5206- Nginx\u542f\u52a8"},"content":{"rendered":"

\u4e0a\u6b21<\/h1>\n

\u9605\u8bfbNginx\u6e90\u4ee3\u7801\u4e4b\u4e00\uff1a\u524d\u8a00\u3002<\/p>\n

\u4fee\u6539<\/h1>\n

5411\uff1a5483d9e77b32 \u7684\u542b\u4e49\u662f\u4ec0\u4e48\uff1f<\/p>\n

\u542f\u52a8nginx<\/h1>\n

\u6839\u636e\u4e0a\u6b21\u6700\u540e\u5199\u7684\u90a3\u6837\uff0c\u4ecemain\u51fd\u6570\u5f00\u59cb\u81ea\u9876\u5411\u4e0b\u5730\u9605\u8bfb\u3002\u56e0\u6b64\u8981\u5148\u627e\u5230main\u51fd\u6570\u3002<\/p>\n

$ <\/span>global -x<\/span> main\r\nmain              202 src\/core\/nginx.c main(<\/span>int argc, char *<\/span>const *<\/span>argv)<\/span>\r\n$<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u4e3b\u51fd\u6570\u4e2d\uff0c\u5bf9\u5404\u4e2a\u7ec4\u4ef6\uff08\u5982\u5b9a\u65f6\u5668\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u3001\u65e5\u5fd7\u3001\u4fe1\u53f7\u7b49\uff09\u8fdb\u884c\u4e86\u521d\u59cb\u5316\u3002<\/p>\n
int<\/span> ngx_cdecl<\/span>\r\nmain<\/span>(<\/span>int<\/span> argc<\/span>,<\/span> char<\/span> *<\/span>const<\/span> *<\/span>argv<\/span>)<\/span>\r\n{<\/span>\r\n            \u30fb<\/span>\r\n            \u30fb<\/span>\r\n    ngx_debug_init<\/span>();<\/span>\r\n            \u30fb<\/span>\r\n            \u30fb<\/span>\r\n    ngx_time_init<\/span>();<\/span>\r\n            \u30fb<\/span>\r\n            \u30fb<\/span>\r\n#if (NGX_PCRE)\r\n<\/span>    ngx_regex_init<\/span>();<\/span>\r\n#endif\r\n<\/span>            \u30fb<\/span>\r\n            \u30fb<\/span>\r\n    log<\/span> =<\/span> ngx_log_init<\/span>(<\/span>ngx_prefix<\/span>);<\/span>\r\n            \u30fb<\/span> \r\n            \u30fb<\/span>\r\n    if<\/span> (<\/span>ngx_init_signals<\/span>(<\/span>cycle<\/span>-><\/span>log<\/span>)<\/span> !=<\/span> NGX_OK<\/span>)<\/span> {<\/span>\r\n        return<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n            \u30fb<\/span> \r\n            \u30fb<\/span>\r\n<\/code><\/pre>\n
\u540c\u65f6\uff0c\u5728ngx_init_cycle\u4e2d\u8fdb\u884c\u7aef\u53e3\u7684\u76d1\u542c\u3002<\/p>\n
    cycle<\/span> =<\/span> ngx_init_cycle<\/span>(<\/span>&<\/span>init_cycle<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u5c06\u5728ngx_open_listening_sockets\u51fd\u6570\u4e2d\u6267\u884c\u3002<\/p>\n
    if<\/span> (<\/span>ngx_open_listening_sockets<\/span>(<\/span>cycle<\/span>)<\/span> !=<\/span> NGX_OK<\/span>)<\/span> {<\/span>\r\n        goto<\/span> failed<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u5c06\u73af\u5883\u53d8\u91cf\u3001\u547d\u4ee4\u884c\u53c2\u6570\u7b49\u4fe1\u606f\u4fdd\u5b58\u5728\u5168\u5c40\u53d8\u91cf\u4e2d\u3002\u6700\u540e\u8fd8\u6709\u4ee5\u4e0b\u5206\u652f\u3002<\/p>\n
    if<\/span> (<\/span>ngx_process<\/span> ==<\/span> NGX_PROCESS_SINGLE<\/span>)<\/span> {<\/span>\r\n        ngx_single_process_cycle<\/span>(<\/span>cycle<\/span>);<\/span>\r\n\r\n    }<\/span> else<\/span> {<\/span>\r\n        ngx_master_process_cycle<\/span>(<\/span>cycle<\/span>);<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u901a\u5e38\u60c5\u51b5\u4e0b\u4f1a\u8c03\u7528ngx_master_process_cycle\u51fd\u6570\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u67e5\u770b\u8fd9\u4e2a\u51fd\u6570\u5185\u90e8\u3002\u5728\u5f00\u5934\u505a\u4e86\u5982\u4e0b\u4fe1\u53f7\u963b\u585e\u8bbe\u7f6e\u3002<\/p>\n
    sigemptyset<\/span>(<\/span>&<\/span>set<\/span>);<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> SIGCHLD<\/span>);<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> SIGALRM<\/span>);<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> SIGIO<\/span>);<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> SIGINT<\/span>);<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_RECONFIGURE_SIGNAL<\/span>));<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_REOPEN_SIGNAL<\/span>));<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_NOACCEPT_SIGNAL<\/span>));<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_TERMINATE_SIGNAL<\/span>));<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_SHUTDOWN_SIGNAL<\/span>));<\/span>\r\n    sigaddset<\/span>(<\/span>&<\/span>set<\/span>,<\/span> ngx_signal_value<\/span>(<\/span>NGX_CHANGEBIN_SIGNAL<\/span>));<\/span>\r\n\r\n    if<\/span> (<\/span>sigprocmask<\/span>(<\/span>SIG_BLOCK<\/span>,<\/span> &<\/span>set<\/span>,<\/span> NULL<\/span>)<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n        ngx_log_error<\/span>(<\/span>NGX_LOG_ALERT<\/span>,<\/span> cycle<\/span>-><\/span>log<\/span>,<\/span> ngx_errno<\/span>,<\/span>\r\n                      \"sigprocmask() failed\"<\/span>);<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
NGINX\u7684\u4e3b\u8fdb\u7a0b\u5c06\u5728\u6b64\u4e4b\u540e\u542f\u52a8\u5de5\u4f5c\u8fdb\u7a0b\uff0c\u5e76\u5728\u9700\u8981\u65f6\u542f\u52a8\u7f13\u5b58\u7ba1\u7406\u5668\u8fdb\u7a0b\uff0c\u7136\u540e\u7b49\u5f85\u4fe1\u53f7\u901a\u8fc7sigsuspend\u53d1\u9001\u8fc7\u6765\u3002\u6709\u5173\u5982\u4f55\u901a\u8fc7\u4fe1\u53f7\u63a7\u5236NGINX\u7684\u65b9\u6cd5\u7684\u4ecb\u7ecd\u53ef\u4ee5\u5728\u5b98\u65b9\u7f51\u7ad9\u4e0a\u627e\u5230\uff0c\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u9605\u6b64\u5904\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5b83\u53ef\u4ee5\u540c\u65f6\u5173\u95edNGINX\u7684\u6240\u6709\u8fdb\u7a0b\u3001\u5b9e\u73b0\u5e73\u7a33\u91cd\u542f\uff0c\u5e76\u8fdb\u884c\u65e0\u505c\u673a\u7248\u672c\u5347\u7ea7\u7b49\u64cd\u4f5c\u3002<\/p>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0cNginx\u4f1a\u5c06\u8fdb\u7a0b\u540d\u79f0\u5206\u522b\u8bbe\u7f6e\u4e3amaster\u3001worker\u548ccache-manager\uff0c\u7136\u540e\u8fdb\u884c\u76f8\u5e94\u7684\u8fdb\u7a0b\u540d\u79f0\u66ff\u6362\u5904\u7406\uff0c\u8fd9\u4e9b\u5904\u7406\u5728\u6b64\u9644\u8fd1\u5b8c\u6210\u3002<\/p>\n
    size<\/span> =<\/span> sizeof<\/span>(<\/span>master_process<\/span>);<\/span>\r\n\r\n    for<\/span> (<\/span>i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> ngx_argc<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n        size<\/span> +=<\/span> ngx_strlen<\/span>(<\/span>ngx_argv<\/span>[<\/span>i<\/span>])<\/span> +<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    title<\/span> =<\/span> ngx_pnalloc<\/span>(<\/span>cycle<\/span>-><\/span>pool<\/span>,<\/span> size<\/span>);<\/span>\r\n\r\n    p<\/span> =<\/span> ngx_cpymem<\/span>(<\/span>title<\/span>,<\/span> master_process<\/span>,<\/span> sizeof<\/span>(<\/span>master_process<\/span>)<\/span> -<\/span> 1<\/span>);<\/span>\r\n    for<\/span> (<\/span>i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> ngx_argc<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n        *<\/span>p<\/span>++<\/span> =<\/span> ' '<\/span>;<\/span>\r\n        p<\/span> =<\/span> ngx_cpystrn<\/span>(<\/span>p<\/span>,<\/span> (<\/span>u_char<\/span> *<\/span>)<\/span> ngx_argv<\/span>[<\/span>i<\/span>],<\/span> size<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    ngx_setproctitle<\/span>(<\/span>title<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6211\u4eec\u63a5\u4e0b\u6765\u6765\u770b\u4e00\u4e0b\u542f\u52a8worker\u8fdb\u7a0b\u7684\u8fc7\u7a0b\uff08\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u8fd8\u6ca1\u6709\u8fdb\u5165sigsuspend\uff09\u3002ngx_start_worker_processes\u662f\u5b83\u7684\u5165\u53e3\u3002<\/p>\n
    ngx_start_worker_processes<\/span>(<\/span>cycle<\/span>,<\/span> ccf<\/span>-><\/span>worker_processes<\/span>,<\/span>\r\n                               NGX_PROCESS_RESPAWN<\/span>);<\/span>\r\n    ngx_start_cache_manager_processes<\/span>(<\/span>cycle<\/span>,<\/span> 0<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u8c03\u7528ngx_spawn_process\u7684\u6b21\u6570\u5e94\u4e0eworker_processes\u7684\u6570\u91cf\u76f8\u7b49\u3002<\/p>\n
    for<\/span> (<\/span>i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> n<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n\r\n        ngx_spawn_process<\/span>(<\/span>cycle<\/span>,<\/span> ngx_worker_process_cycle<\/span>,<\/span>\r\n                          (<\/span>void<\/span> *<\/span>)<\/span> (<\/span>intptr_t<\/span>)<\/span> i<\/span>,<\/span> \"worker process\"<\/span>,<\/span> type<\/span>);<\/span>\r\n                        \u30fb<\/span>\r\n                        \u30fb<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\uff0c\u901a\u8fc7\u4f7f\u7528ioctl\u6216fcntl\u6765\u8fdb\u884c\u5957\u63a5\u5b57\u7684\u5404\u79cd\u8bbe\u7f6e\u540e\uff0c\u4ece\u4e3b\u8fdb\u7a0bfork\u51fa\u5de5\u4f5c\u8fdb\u7a0b\u3002<\/p>\n
    pid<\/span> =<\/span> fork<\/span>();<\/span>\r\n\r\n    switch<\/span> (<\/span>pid<\/span>)<\/span> {<\/span>\r\n\r\n    case<\/span> -<\/span>1<\/span>:<\/span>\r\n        ngx_log_error<\/span>(<\/span>NGX_LOG_ALERT<\/span>,<\/span> cycle<\/span>-><\/span>log<\/span>,<\/span> ngx_errno<\/span>,<\/span>\r\n                      \"fork() failed while spawning <\/span>\\\"<\/span>%s<\/span>\\\"<\/span>\"<\/span>,<\/span> name<\/span>);<\/span>\r\n        ngx_close_channel<\/span>(<\/span>ngx_processes<\/span>[<\/span>s<\/span>].<\/span>channel<\/span>,<\/span> cycle<\/span>-><\/span>log<\/span>);<\/span>\r\n        return<\/span> NGX_INVALID_PID<\/span>;<\/span>\r\n\r\n    case<\/span> 0<\/span>:<\/span>\r\n        ngx_pid<\/span> =<\/span> ngx_getpid<\/span>();<\/span>\r\n        proc<\/span>(<\/span>cycle<\/span>,<\/span> data<\/span>);<\/span>\r\n        break<\/span>;<\/span>\r\n\r\n    default:<\/span>\r\n        break<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u5f53 master \u8fdb\u7a0b\u5728\u542f\u52a8\u4e86\u6240\u6709\u7684 worker \u8fdb\u7a0b\u540e\uff0c\u901a\u8fc7\u8c03\u7528 sigsuspend \u8fdb\u5165\u4fe1\u53f7\u7b49\u5f85\u72b6\u6001\uff0c\u6b64\u65f6 proc \u5c06\u4f5c\u4e3a ngx_spawn_process \u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570 ngx_worker_process_cycle\uff0c\u6210\u4e3a worker \u8fdb\u7a0b\u7684\u4e3b\u5faa\u73af\u3002<\/p>\n
\u6240\u4ee5\uff0c\u6211\u8bfb\u5230\u4e86nginx\u5df2\u7ecf\u542f\u52a8\u5e76\u4e14\u5355\u4e3b\u591a\u5de5\u4f5c\u7ebf\u7a0b\u5df2\u7ecf\u542f\u52a8\u3002\u8fd9\u6b21\u5c31\u5230\u8fd9\u91cc\u4e86\u3002<\/p>\n
\u4e0b\u6b21 (\u8ba1\u5212)<\/h1>\n
nginx\u6e90\u4ee3\u7801\u9605\u8bfb\u4e4b\u4e8c\uff1a\u4e8b\u4ef6\u9a71\u52a8\u5f15\u64ce\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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