{"id":1279,"date":"2022-03-08T23:30:15","date_gmt":"2022-03-08T15:30:15","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1279"},"modified":"2022-06-11T02:26:20","modified_gmt":"2022-06-10T18:26:20","slug":"st%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-server","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1279","title":{"rendered":"ST\u6e90\u7801\u5206\u6790-server"},"content":{"rendered":"\n

\u672c\u6587\u4e3b\u8981\u8bb2\u89e3\uff0cST \u63d0\u4f9b\u7684\u793a\u4f8b\u7a0b\u5e8f server<\/code> \uff0cmake<\/code> \u7f16\u8bd1\u4e4b\u540e\uff0c\u4f1a\u5728 obj<\/code> \u76ee\u5f55\u751f\u6210 server<\/code> \u53ef\u6267\u884c\u6587\u4ef6\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

server<\/code> \u662f\u4e00\u4e2a \u7b80\u5355\u7684 http<\/code> \u670d\u52a1\u5668\uff0c\u8bbf\u95ee\u4e4b\u540e\u8f93\u51fa\u4e00\u4e2a \u7b80\u5355\u7684 html<\/code> \u9875\u9762\uff0c\u4f7f\u7528\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n

.\/obj\/server -l .\/ -b 192.168.0.122:8888<\/code><\/pre>\n\n\n\n
\u5728\u521a\u5f00\u59cb\u8c03\u8bd5\u7684\u65f6\u5019\uff0c\u63a8\u8350\u52a0\u4e0a -i<\/code> \u9009\u9879\uff0c\u53ef\u4ee5\u9632\u6b62 server<\/code> \u5728\u540e\u53f0\u8fd0\u884c\u3002<\/p>\n\n\n\n
\n\n\n\n
server<\/code> \u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e0a\u9762\u6d41\u7a0b\u51e0\u4e2a\u6bd4\u8f83\u7b80\u5355\u7684\u51fd\u6570\uff0c\u6211\u7b80\u5355\u8fc7\u4e00\u904d\uff1a<\/p>\n\n\n\n
1\uff0cparse_arguments()<\/code>\uff0c\u89e3\u6790\u547d\u4ee4\u884c\u53c2\u6570\u5230 \u53d8\u91cf\u3002<\/p>\n\n\n\n
2\uff0cset_thread_throttling()<\/code>\uff0c\u5c31\u6839\u636e\u4e00\u4e9b\u89c4\u5219\u8bbe\u7f6e 3 \u4e2a\u53d8\u91cf\uff0cmax_threads<\/code>\uff0cmin_wait_threads<\/code>\uff0cmax_wait_threads<\/code><\/p>\n\n\n\n
3\uff0ccreate_listeners()<\/code>\uff0c\u521b\u5efa\u5957\u63a5\u5b57\uff0c\u7136\u540e listen<\/code>\uff0c\u8fd9\u91cc\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a ip \u7aef\u53e3 \u3002<\/p>\n\n\n\n
4\uff0copen_log_files()<\/code>\uff0c\u521b\u5efa pid<\/code> \u6587\u4ef6\uff0c\u8fd9\u91cc pid<\/code> \u6587\u4ef6\u597d\u50cf\u6ca1\u6709\u9650\u5236\u4e24\u4e2a\u7a0b\u5e8f\u540c\u65f6\u5141\u8bb8\u3002\u6700\u91cd\u8981\u7684\u662f\u6253\u5f00 ERRORS_FILE<\/code> \u9519\u8bef\u6587\u4ef6\u3002<\/p>\n\n\n\n
5\uff0cload_configs()<\/code> \uff0c\u4ec0\u4e48\u90fd\u6ca1\u505a\uff0c\u7559\u7ed9\u7528\u6237\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n
\n\n\n\n
google_ads_content<\/p>\n\n\n\n
\n\n\n\n
\u5148\u8bb2\u89e3\u4e00\u4e0b server<\/code> \u7a0b\u5e8f \u4e2d\u7684\u4e00\u4e2a\u91cd\u70b9\u7ed3\u6784\u4f53 struct socket_info<\/code>\u3002<\/p>\n\n\n\n
struct socket_info {\n  st_netfd_t nfd;               \/* Listening socket                     *\/\n  char *addr;                   \/* Bind address                         *\/\n  unsigned int port;            \/* Port                                 *\/\n  int wait_threads;             \/* Number of threads waiting to accept  *\/\n  int busy_threads;             \/* Number of threads processing request *\/\n  int rqst_count;               \/* Total number of processed requests   *\/\n} srv_socket[MAX_BIND_ADDRS];   \/* Array of listening sockets   <\/code><\/pre>\n\n\n\n
\u4e0a\u9762\u7684\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a \u5168\u5c40\u6570\u636esrv_socket<\/code> \uff0c\u8fd9\u4e2a\u6570\u7ec4\u4e00\u822c\u53ea\u6709 [0]<\/code> \u7528\u5230\uff0c\u53ea\u7ed1\u5b9a\u4e00\u4e2a ip\u8ddf\u7aef\u53e3\u3002\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7684\u6bcf\u4e2a\u5b57\u6bb5\u90fd\u6bd4\u8f83\u91cd\u8981\uff0c\u4e0b\u9762\u8be6\u7ec6\u8bb2\u89e3\u4e00\u4e9b\uff1a<\/p>\n\n\n\n
1\uff0c st_netfd_t nfd;<\/code> \u8fd9\u4e2a\u662f \u670d\u52a1\u5668 listen<\/code> \u7684 tcp<\/code> \u5957\u63a5\u5b57\uff0cST \u81ea\u5df1\u5c01\u88c5\u4e86\u4e00\u4e0b\u3002<\/p>\n\n\n\n
2\uff0c char *addr;<\/code> IP \u5730\u5740<\/p>\n\n\n\n
3\uff0cunsigned int port;<\/code> \u7aef\u53e3\u3002<\/p>\n\n\n\n
4\uff0cint wait_threads;<\/code> \u4ee3\u8868\u6709\u591a\u5c11\u4e2a\u534f\u7a0b \u963b\u585e\u5728 st_accept()<\/code> \u51fd\u6570 \u3002<\/p>\n\n\n\n
5\uff0cint busy_threads<\/code> \u4ee3\u8868\u6709\u591a\u5c11\u4e2a\u534f\u7a0b\u5df2\u7ecf \u4ece st_accept()<\/code> \u62ff\u5230 fd<\/code>\uff0c\u5f00\u59cb\u5904\u7406 http<\/code> \u8bf7\u6c42\u3002<\/p>\n\n\n\n
6\uff0cint rqst_count;<\/code>\u4ee3\u8868\u5904\u7406\u4e86\u591a\u5c11\u4e2a http \u8bf7\u6c42\u3002<\/p>\n\n\n\n
\n\n\n\n
server \u7a0b\u5e8f\u67093\u4e2a\u91cd\u70b9\u51fd\u6570\u3002<\/p>\n\n\n\n
1\uff0cstart_processes()<\/code> \uff0c\u5f00\u542f\u591a\u8fdb\u7a0b\u3002\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6 select()<\/code> \u76d1\u542c \u670d\u52a1\u7aef\u5957\u63a5\u5b57\uff08srv_socket[0].nfd<\/code>\uff09\u3002<\/p>\n\n\n\n
2\uff0cinstall_sighandlers()<\/code> \uff0c\u6ce8\u518c\u4fe1\u53f7 SIGTERM<\/code>\uff0cSIGHUP<\/code>\uff0cSIGUSR1<\/code>\uff0c \u7528 pipe()<\/code> \u7ba1\u9053\u628a \u4fe1\u53f7\u4e8b\u4ef6 \u8f6c\u6210 I\/O \u4e8b\u4ef6\uff0c\u8fd9\u6837\u5c31\u80fd\u7528 select<\/code> \u76d1\u542c \u7ba1\u9053\u7684 fd<\/code> \uff0c\u8ddf\u5176\u4ed6\u7684\u7f51\u7edc\u5957\u63a5\u5b57\u540c\u4e00\u4e2a select<\/code> \u76d1\u542c\u3002<\/p>\n\n\n\n
Only two types of external events are handled by the library's scheduler, because only these events can be detected by select(2)<\/code> or poll(2)<\/code>: I\/O events (a file descriptor is ready for I\/O) and time events (some timeout has expired). However, other types of events (such as a signal sent to a process) can also be handled by converting them to I\/O events. For example, a signal handling function can perform a write to a pipe (write(2)<\/code> is reentrant\/asynchronous-safe), thus converting a signal event to an I\/O event<\/p><\/blockquote>\n\n\n\n
3\uff0cstart_threads()<\/code> \uff0c\u5f00\u542f max_wait_threads<\/code> \u6570\u91cf\u7684\u534f\u7a0b\uff0c\u5168\u90e8\u963b\u585e\u5728 st_accept()<\/code> \u51fd\u6570 \u7b49\u5f85\u5ba2\u6237\u7aef\u8bf7\u6c42\u3002<\/p>\n\n\n\n
\n\n\n\n
\u4e0b\u9762\u4ed4\u7ec6\u5206\u6790\u91cd\u70b9\u51fd\u6570 start_processes()<\/code> \uff0c\u6d41\u7a0b\u56fe\u53c2\u8003\u4e0a\u9762\u7684\uff0c\u91cd\u70b9\u5982\u4e0b\u3002<\/p>\n\n\n\n
1\uff0cstart_processes()<\/code> \u4f1a fork()<\/code> \u5f88\u591a\u5b50\u8fdb\u7a0b\uff0c\u6240\u6709\u5b50\u8fdb\u7a0b\u90fd\u4f1a\u8fd4\u56de main() \u51fd\u6570\u6267\u884c\u540e\u7eed\u7684\u903b\u8f91\u3002\u4f46\u662f \u7236\u8fdb\u7a0b\u4e0d\u8fd4\u56de main()<\/code> \u51fd\u6570\uff0c\u7236\u8fdb\u7a0b\u4e00\u76f4\u963b\u585e\u5728 start_processes()<\/code> \u51fd\u6570\u91cc\u9762\uff0c\u7b49\u5f85\u67d0\u4e2a\u5b50\u8fdb\u7a0b\u7ed3\u675f\u6216\u8005\u610f\u5916\u7ec8\u7ed3\uff0c\u7136\u540e\u6253\u5370\u5b50\u8fdb\u7a0b\u9000\u51fa\u4fe1\u606f\uff0c\u5728 fork()<\/code> \u4e00\u4e2a\u5b50\u8fdb\u7a0b\u3002\u8fd9\u6837\uff0c\u7236\u8fdb\u7a0b \u5c31\u662f\u4e00\u4e2a watchdog<\/code>\uff0c\u770b\u95e8\u4eba\uff0c\u5b50\u8fdb\u7a0b\u5982\u679c\u6709\u4ee3\u7801\u95ee\u9898\uff0c\u5954\u6e83\u4e86\uff0c\u7236\u8fdb\u7a0b\u5c31\u4f1a\u88ab\u6fc0\u6d3b\uff0c\u6536\u96c6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\uff0c\u65b9\u4fbf\u6392\u67e5\u9519\u8bef\uff0c\u7136\u540e\u7236\u8fdb\u7a0b\u518d\u751f\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u51fa\u6765\u5904\u7406\u4e1a\u52a1\u3002<\/p>\n\n\n\n
\u8fd9\u79cd watchdog<\/code>\u7684\u673a\u5236\u7279\u522b\u597d\uff0c\u56e0\u4e3a\u5199\u4ee3\u7801\u603b\u6709\u4e00\u4e9b\u610f\u5916\u7684\u60c5\u51b5\uff0c\u4e0d\u662f\u7ecf\u5e38\u53d1\u751f\u3002\u5076\u5c14\u5954\u6e83\uff0c\u5c31\u5b50\u8fdb\u7a0b\u5954\u6e83\uff0c\u90a3\u5c31\u7531\u7236\u8fdb\u7a0b\u518d\u751f\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u51fa\u6765\u5c31\u884c\u3002<\/p>\n\n\n\n
\u5728 Linux \u73af\u5883\uff0c\u6709\u4e00\u4e2a\u8f6f\u4ef6\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u79cd \u770b\u95e8\u4eba\u529f\u80fd\uff0c\u5c31\u662f supervisor<\/code><\/a>\u3002<\/p>\n\n\n\n
\u7236\u8fdb\u7a0b\u9664\u4e86\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\uff0c\u8fd8\u4f1a\u5904\u7406\u4fe1\u53f7\uff0c\u5982\u4e0b\u9762\u4ee3\u7801\uff0cwait() \u51fd\u6570\u5728\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u4f1a\u88ab\u4fe1\u53f7\u4e2d\u65ad\uff0cerrno<\/code> \u7b49\u4e8e EINTR<\/code> \u5c31\u4f1a\u7ee7\u7eed\u7b49\u5f85\u3002<\/p>\n\n\n\n
if ((pid = wait(&status)) < 0) {\n     if (errno == EINTR)\ncontinue;\n     err_sys_quit(errfd, "ERROR: watchdog: wait");\n   }<\/code><\/pre>\n\n\n\n
\u7236\u8fdb\u7a0b\u662f\u7528 wdog_sighandler()<\/code> \u51fd\u6570\u6765\u5904\u7406\u4fe1\u53f7\u7684\uff0c\u6240\u6709\u7684\u4fe1\u53f7\u90fd\u4f1a\u4f20\u9012\u4e00\u904d\u7ed9\u5b50\u8fdb\u7a0b\uff0c\u7136\u540e\u81ea\u5df1\u518d\u5904\u7406\u4fe1\u53f7\u3002\u6f14\u793a\u4e00\u4e0b\uff0c\u6211\u7528\u4ee5\u4e0b\u547d\u4ee4 \u53d1\u9001\u4e00\u4e2a SIGUSR1<\/code> \u4fe1\u53f7\u7ed9\u7236\u8fdb\u7a0b \uff0c13287<\/code> \u662f\u6211\u7684\u7236\u8fdb\u7a0bID\u3002<\/p>\n\n\n\n
kill -s SIGUSR1 13287<\/code><\/pre>\n\n\n\n
\u4e0a\u9762\u7684\u547d\u4ee4\u6267\u884c\u4e4b\u540e\uff0c\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u4f1a\u6253\u5370\u4e00\u904d\u4fe1\u606f\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
server<\/code> \u7a0b\u5e8f\u6709\u5904\u7406 3 \u79cd\u4fe1\u53f7\uff1a<\/p>\n\n\n\n
  1. SIGTERM<\/code>\uff0c\u7ec8\u7ed3\u8fdb\u7a0b\u3002<\/li>
  2. SIGHUP<\/code>\uff0c\u867d\u7136\u6ce8\u91ca\u5199\u7684 restart\uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\u53ea\u662f\u91cd\u65b0\u52a0\u8f7d\u4e86\u914d\u7f6e\u6587\u4ef6\u3002<\/li>
  3. SIGUSR1<\/code> \uff0c\u6253\u5370\u4fe1\u606f\u3002<\/li><\/ol>\n\n\n\n
    \n\n\n\n
    \u4e3b\u8fdb\u7a0b\u4e0d\u8fd4\u56de main()<\/code> , \u5b50\u8fdb\u7a0b\u5168\u90e8\u8fd4\u56de main\uff0c\u7136\u540e \u963b\u585e\u5728 process_signals()<\/code> \u5904\u7406\u4fe1\u53f7\u3002<\/p>\n\n\n\n
    \u76f8\u5f53\u4e8e \u59cb\u7956\u534f\u7a0b<\/strong> \u963b\u585e\u5728 process_signals()<\/code> \u5904\u7406\u4fe1\u53f7\u3002 \u6709\u591a\u5c11\u4e2a\u8fdb\u7a0b\u5c31\u6709\u591a\u5c11\u4e2a\u59cb\u7956\u534f\u7a0b\u3002<\/p>\n\n\n\n
    \n\n\n\n
    \u63a5\u4e0b\u6765\u5206\u6790\u6700\u540e\u4e00\u4e2a\u91cd\u70b9\u51fd\u6570 start_threads()<\/code>\uff0c\u8fd9\u4e2a\u662f\u5b50\u8fdb\u7a0b\u7684\u5f00\u59cb\u534f\u7a0b\u7684\u51fd\u6570\uff0c\u7528\u6765\u5904\u7406http\u8bf7\u6c42\u7684\uff0c\u6d41\u7a0b\u56fe\u53c2\u8003\u4e0a\u9762\u7684\uff1a<\/p>\n\n\n\n
    start_threads()<\/code> \u7528 st_thread_create()<\/code> \u521b\u5efa\u4e86\u5f88\u591a\u4e2a\u534f\u7a0b\u51fd\u6570 handle_connections()<\/code>\u3002\u8fd9\u4e9b\u534f\u7a0b\u51fd\u6570\u5168\u90e8\u963b\u585e\u5728 st_accept()<\/code> \u90a3\u91cc\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u8bf7\u6c42\u3002<\/p>\n\n\n\n
    \n\n\n\n
    \u76f8\u5173\u9605\u8bfb\uff1a<\/p>\n\n\n\n
    1. \u300a\u8fdb\u7a0b\uff0c\u7ebf\u7a0b\uff0c\u4fe1\u53f7\u300b<\/a><\/li><\/ol>\n\n\n\n
      \n\n\n\n
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