![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144454-6a637a669ce9f.png\")
<\/p>\n<\/p>\n
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\u4e2a\u4eba\u4e3b\u9875：YYYing.<\/p>\n
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\u7cfb\u5217\u4e0a\u671f\u5185\u5bb9：\u3010Linux\/C++\u7f51\u7edc\u7bc7(\u4e00) \u3011TCP\/UDP \u7f16\u7a0b\u6a21\u578b\u4e0e Socket \u7f51\u7edc\u7f16\u7a0b<\/p>\n
\u7cfb\u5217\u4e0b\u671f\u5185\u5bb9：\u6682\u65e0<\/p>\n
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\u524d\u8a00：<\/p>\n
TCP\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5f15\u5165<\/p>\n
\u4e00\u3001\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u5e76\u53d1？<\/p>\n
\u4e8c\u3001\u591a\u8fdb\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668<\/p>\n
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I\/O\u591a\u8def\u590d\u7528<\/p>\n
\u4e00\u3001IO\u591a\u8def\u590d\u7528\u4e4bselect<\/p>\n
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\u00a0📖\u00a0select\u7684\u57fa\u672c\u7528\u6cd5<\/p>\n
\u00a0📖\u00a0select\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/p>\n
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\u7ed3\u8bed<\/p>\n
—\u2b50\ufe0f\u5c01\u9762\u81ea\u53d6\u2b50\ufe0f—<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144455-6a637a670bf9b.gif\")
<\/p>\n<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5bf9\u4e8e\u6211\u4eec\u4e0a\u8282\u8bfe\u7684TCP\u6a21\u578b\u6765\u8bf4，\u6bcf\u4e00\u4e2a\u521d\u5b66\u8005\u90fd\u4f1a\u9047\u5230\u540c\u4e00\u4e2a\u201c\u62e6\u8def\u864e\u201d：\u4e3a\u4ec0\u4e48\u6211\u7684\u670d\u52a1\u5668\u53ea\u80fd\u548c\u4e00\u4e2a\u5ba2\u6237\u7aef\u804a\u5929？\u4e00\u65e6\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u5c1d\u8bd5\u8fde\u63a5，\u7a0b\u5e8f\u5c31\u4eff\u4f5b\u201c\u6b7b\u201d\u4e86\u4e00\u6837\u6beb\u65e0\u53cd\u5e94？<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u90a3\u4e48\u4eca\u5929，\u6211\u4eec\u5c31\u6765\u5f7b\u5e95\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898，\u804a\u804aTCP\u5e76\u53d1\u670d\u52a1\u5668\u7684\u4e09\u79cd\u4e3b\u6d41\u5b9e\u73b0\u65b9\u6848：\u591a\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u548cIO\u591a\u8def\u590d\u7528\u3002<\/span><\/p>\n \u60f3\u8c61\u4e00\u4e0b，\u4f60\u5f00\u4e86\u4e00\u5bb6\u53ea\u6709\u4e00\u540d\u670d\u52a1\u5458\u7684\u9910\u5385（\u5355\u8fdb\u7a0b\/\u5355\u7ebf\u7a0b\u670d\u52a1\u5668）\u3002<\/p>\n \u8fd9\u663e\u7136\u4e0d\u662f\u4e00\u5bb6\u201c\u7f51\u7ea2\u9910\u5385\u201d\u8be5\u6709\u7684\u6837\u5b50\u3002\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d，\u5982\u679c\u670d\u52a1\u5668\u4e00\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u8fde\u63a5，\u90a3\u5b83\u7684\u541e\u5410\u91cf\u5c06\u4f4e\u5f97\u4ee4\u4eba\u53d1\u6307\u3002\u6211\u4eec\u9700\u8981\u7684\u662f\u201c\u5e76\u53d1\u201d\u2014\u2014\u5373\u5728\u540c\u4e00\u65f6\u95f4\u6bb5\u5185，\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002<\/p>\n \u00a0📖\u00a0\u6838\u5fc3\u601d\u60f3：\u6211\u4eec\u4e3b\u8fdb\u7a0b\u53ef\u4ee5\u7528\u4e8e\u5b8c\u6210\u5bf9\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u800c\u5b50\u8fdb\u7a0b\u53ef\u4ee5\u5b8c\u6210\u5bf9\u5ba2\u6237\u7aef\u901a\u4fe1\u64cd\u4f5c<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8bdd\u4e0d\u591a\u8bf4，\u6211\u4eec\u76f4\u63a5\u8fdb\u5165\u4ee3\u7801\u4e0e\u6f14\u793a\u73af\u8282<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u5148\u770b\u4ee3\u7801，\u6211\u4eec\u9700\u8981\u6ce8\u610f\u7684\u662f\u6b64\u5904\u50f5\u5c38\u8fdb\u7a0b\u7684\u56de\u6536\u65b9\u5f0f<\/span>，\u800c\u9700\u8981\u6ce8\u610f\u7684\u70b9\u6b63\u5982\u6211\u4eec\u4ee3\u7801\u5757\u8bf4\u7684：\u5982\u679c\u6211\u4eec\u4e3b\u7ebf\u7a0b\u662f\u4ee5wait()\u51fd\u6570\u8fd9\u79cd\u963b\u585e\u65b9\u5f0f<\/span>\u6765\u8fdb\u884c\u56de\u6536，\u90a3\u4e48\u6b64\u65f6\u82e5\u6ca1\u6709\u5ba2\u6237\u7aef\u4e0b\u7ebf，\u6211\u4eec\u7684\u4e3b\u7ebf\u7a0b\u5c31\u5f97\u4e00\u76f4\u7b49\u7740，\u8fd9\u6837\u662f\u6ca1\u529e\u6cd5\u5904\u7406\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42，\u4ece\u800c\u8fbe\u5230\u5e76\u53d1\u7684\u6548\u679c\u7684，\u90a3\u4e48waitpid(-1, NULL, WNOHANG)<\/span>\u5c31\u53ef\u4ee5\u4e86\u5417？\u7b54\u6848\u662f\u4e5f\u4e0d\u884c，\u82e5\u5f53\u5ba2\u6237\u7aef\u5df2\u7ecf\u4e0b\u7ebf\u4e86，\u800c\u6211\u4eec\u7684\u4e3b\u7ebf\u7a0b\u8fd8\u5728\u4e0a\u9762\u7684accept\u5904\u5361\u7740，\u90a3\u4e48\u5c31\u4e0d\u80fd\u5230\u4e0b\u9762\u8fdb\u884c\u56de\u6536\u4e86\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u6240\u4ee5\u770b\u5230\u6211\u4eecmain\u51fd\u6570\u4e00\u5f00\u59cb\u7684\u5199\u6cd5，\u6211\u4eec\u9700\u8981\u7528\u5230\u4fe1\u53f7\u5904\u7406<\/span>\u7684\u65b9\u6cd5，\u82e5\u5b50\u7ebf\u7a0b\u53d1\u9001\u4e86SIGCHLD\u4fe1\u53f7，\u90a3\u4e48\u6211\u4eec\u4e3b\u7ebf\u7a0b\u4f1a\u81ea\u52a8\u5904\u7406\u5bf9\u4e8e\u8fd9\u4e2a\u4fe1\u53f7\u7684\u5904\u7406<\/p>\n #include<iostream> void handler(int signo){ int main(int argc, const char *argv[]){ \/\/ 1\u3001\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26 \/\/ 2\u3001\u7ed1\u5b9aip\u5730\u5740\u4e0e\u7aef\u53e3\u53f7 if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){ \/\/ 3\u3001\u542f\u52a8\u76d1\u542c \/\/ 4\u3001\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42 \/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b\u7528\u4e8e\u548c\u5ba2\u6237\u7aef\u901a\u4fe1 \/\/ \u5173\u95ednewfd，\u6b64\u65f6\u6211\u4eec\u7236\u8fdb\u7a0b\u4e0d\u5bf9newfd\u8fdb\u884c\u64cd\u4f5c，\u540c\u7406\u5b50\u8fdb\u7a0b\u4e5f\u4e0d\u5bf9sfd\u8fdb\u884c\u64cd\u4f5c \/\/ 6\u3001\u5173\u95ed\u5957\u63a5\u5b57 return 0; \u5e76\u53d1\u6548\u679c\u5c55\u793a，\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u7528\u4e24\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8fde\u63a5\u4e86<\/p>\n \u7a33\u5b9a\u6027\u9ad8：\u4e00\u4e2a\u8fdb\u7a0b\u5d29\u6e83\u4e0d\u5f71\u54cd\u5176\u4ed6\u5ba2\u6237\u7aef<\/p>\n<\/li>\n \u9694\u79bb\u6027\u597d：\u8fdb\u7a0b\u95f4\u5185\u5b58\u72ec\u7acb，\u5b89\u5168\u6027\u9ad8<\/p>\n<\/li>\n<\/ul>\n \u8d44\u6e90\u6d88\u8017\u5927：\u6bcf\u4e2a\u8fdb\u7a0b\u5360\u7528\u72ec\u7acb\u5730\u5740\u7a7a\u95f4（\u51e0MB\u8d77\u6b65），\u8fde\u63a5\u6570\u4e0a\u5343\u65f6\u7cfb\u7edf\u5403\u4e0d\u6d88<\/p>\n<\/li>\n \u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500：CPU \u5728\u8fdb\u7a0b\u95f4\u5207\u6362\u9700\u8981\u4fdd\u5b58\/\u6062\u590d\u5927\u91cf\u72b6\u6001<\/p>\n<\/li>\n \u7f16\u7a0b\u590d\u6742：\u9700\u8981\u5904\u7406\u50f5\u5c38\u8fdb\u7a0b\u3001\u4fe1\u53f7\u5904\u7406\u7b49<\/p>\n<\/li>\n<\/ul>\n void handler(int signo){ signal(SIGCHLD, handler); \/\/\u5c06\u4fe1\u53f7\u4e0e\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u8fde\u63a5\u8d77\u6765 while(1){ pid = fork(); \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b\u7528\u4e8e\u8ddf\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1 exit(EXIT_SUCCESS); \/\/\u9000\u51fa\u5b50\u8fdb\u7a0b } \u00a0📖\u00a0\u6838\u5fc3\u601d\u60f3：\u4e0e\u591a\u8fdb\u7a0b\u4e00\u6837，\u4e3b\u7ebf\u7a0b\u7528\u4e8e\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42， \u5206\u652f\u7ebf\u7a0b\u7528\u4e8e\u8ddf\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u6b64\u5904\u6211\u4eec\u591a\u7ebf\u7a0b\u7684\u5b9e\u73b0\u5c31\u4e0d\u7528\u50cf\u591a\u8fdb\u7a0b\u90a3\u4e9b\u76f8\u5f53\u90a3\u4e48\u591a，\u6211\u4eec\u5728\u521b\u5efa\u7ebf\u7a0b\u7684\u4e0b\u65b9\u5c06\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u5206\u79bb\u6001\u5373\u53ef<\/p>\n #include<iostream> struct Info{ void *deal_cli_msg(void *arg){ \/\/ 5\u3001\u6570\u636e\u6536\u53d1 int main(int argc, const char *argv[]){ \/\/ 2\u3001\u7ed1\u5b9aip\u5730\u5740\u4e0e\u7aef\u53e3\u53f7 if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){ \/\/ 3\u3001\u542f\u52a8\u76d1\u542c \/\/ 4\u3001\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42 struct Info buf = {newfd, cin};<\/p>\n pthread_t tid = -1; \/\/ 6\u3001\u5173\u95ed\u5957\u63a5\u5b57 return 0; \u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53ef\u4ee5\u6765\u770b\u770b\u6211\u4eec\u8fd0\u884c\u6548\u679c，\u6211\u4eec\u6b64\u5904\u7684\u5e76\u53d1\u6548\u679c\u4f9d\u65e7\u662f\u6709\u7684<\/p>\n \u8d44\u6e90\u5360\u7528\u5c11：\u7ebf\u7a0b\u6808\u901a\u5e38\u53ea\u6709\u51e0MB，\u4e14\u5171\u4eab\u4ee3\u7801\u6bb5\u548c\u6570\u636e\u6bb5<\/p>\n<\/li>\n \u5207\u6362\u901f\u5ea6\u5feb：\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362\u6bd4\u8fdb\u7a0b\u5feb\u4e00\u4e2a\u6570\u91cf\u7ea7<\/p>\n<\/li>\n \u901a\u4fe1\u7b80\u5355：\u5171\u4eab\u5185\u5b58，\u6570\u636e\u4ea4\u6362\u65b9\u4fbf<\/p>\n<\/li>\n<\/ul>\n \u7a33\u5b9a\u6027\u98ce\u9669：\u4e00\u4e2a\u7ebf\u7a0b\u5d29\u6e83\u53ef\u80fd\u5bfc\u81f4\u6574\u4e2a\u8fdb\u7a0b\u9000\u51fa（\u5f71\u54cd\u6240\u6709\u5ba2\u6237\u7aef）<\/p>\n<\/li>\n \u540c\u6b65\u590d\u6742：\u5171\u4eab\u6570\u636e\u9700\u8981\u52a0\u9501（mutex），\u5bb9\u6613\u51fa\u73b0\u6b7b\u9501\u3001\u7ade\u6001\u6761\u4ef6<\/p>\n<\/li>\n C10K \u95ee\u9898：\u8fde\u63a5\u6570\u8fbe\u5230\u4e07\u7ea7\u522b\u65f6，\u7ebf\u7a0b\u5207\u6362\u5f00\u9500\u4ecd\u4e0d\u53ef\u5ffd\u89c6<\/p>\n<\/li>\n<\/ul>\n \/\/\u5b9a\u4e49\u5206\u652f\u7ebf\u7a0b \/\/\u4e3b\u7ebf\u7a0b\u5185\u5bb9 while(1){ pthread_create(&tid, NULL, deal_cli_msg, &buf); \/\/\u521b\u5efa\u5206\u652f\u7ebf\u7a0b<\/p>\n \/\/\u5c06\u7ebf\u7a0b\u8bbe\u7f6e\u6210\u5206\u79bb\u6001 \u00a0📖\u00a0\u6838\u5fc3\u601d\u60f3：\u4e00\u4e2a\u7ebf\u7a0b\u76d1\u89c6\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26，\u54ea\u4e2a\u5ba2\u6237\u7aef\u6709\u6570\u636e\u6765\u5c31\u5904\u7406\u54ea\u4e2a，\u6ca1\u6709\u6570\u636e\u65f6\u963b\u585e\u5728 select\/poll\/epoll \u4e0a，\u4e0d\u6d6a\u8d39 CPU\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u5728\u5f00\u8bb2\u4e4b\u524d\u5462，\u6211\u60f3\u5148\u5f15\u5165\u4e00\u4e2a\u4f8b\u5b50，\u52a9\u4e8e\u5927\u5bb6\u540e\u7eed\u7406\u89e3\u6211\u4eecI\/O\u591a\u8def\u590d\u7528\u7684\u542b\u4e49：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e8b\u4ef6\u548c\u51fd\u6570\u7684\u5173\u7cfb：\u6bd4\u5982，scanf\u662f\u4e00\u4e2a\u963b\u585e\u51fd\u6570，\u8be5\u51fd\u6570\u5b8c\u6210\u7684\u662f\u8f93\u5165\u4e8b\u4ef6<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5f53\u51fd\u6570\u5148\u4e8e\u4e8b\u4ef6\u53d1\u751f\u65f6，\u51fd\u6570\u4f1a\u963b\u585e\u7b49\u5f85\u4e8b\u4ef6\u7684\u5230\u6765<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5f53\u51fd\u6570\u540e\u4e8e\u4e8b\u4ef6\u53d1\u751f\u65f6，\u51fd\u6570\u5c31\u4e0d\u4f1a\u963b\u585e，\u76f4\u63a5\u6267\u884c<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u6700\u5178\u578b\u7684\u5c31\u662f\u6211\u4eec\u5728luogu\u4e0a\u5199\u9898，\u8f93\u5165\u6837\u4f8b\u6570\u636e\u7684\u65f6\u5019\u6211\u4eec\u662f\u76f4\u63a5\u4e00\u6b21\u6027\u8f93\u5165\u5b8c\u4e86\u7684，\u6240\u4ee5\u7a0b\u5e8f\u5c31\u4f1a\u76f4\u63a5\u6267\u884c，\u4f46\u5728\u4e00\u822c\u7684IDE\u4e0a，\u6211\u4eec\u662f\u5148\u6267\u884c\u7a0b\u5e8f\u540e\u8f93\u5165\u6570\u636e\u7684，\u90a3\u4e48\u6b64\u65f6\u6211\u4eec\u5c31\u4f1a\u88ab\u963b\u585e，\u76f4\u5230\u8f93\u5165\u6570\u636e\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u4e0d\u96be\u770b\u51fa：<\/span>\u5982\u679c\u4e8b\u4ef6\u5148\u4e8e\u51fd\u6570\u53d1\u751f，\u5f53\u7a0b\u5e8f\u518d\u6267\u884c\u5230\u51fd\u6570\u65f6，\u51fd\u6570\u4f1a\u76f4\u63a5\u8fd0\u884c，\u4e0d\u4f1a\u963b\u585e\u4e86<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u90a3\u4e48\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u770b\u770b\u6211\u4eecI\/O\u591a\u8def\u590d\u7528\u7684\u539f\u7406\u56fe\u4e86\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u53ef\u4ee5\u770b\u5230\u6211\u4eec\u73b0\u5728\u76f8\u5f53\u4e8e\u662f\u6709\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u5728\u7b49\u7740\u6211\u4eec\u7684\u963b\u585e\u51fd\u6570\u8fdb\u884c\u68c0\u67e5，\u7136\u540e\u5f53\u6709\u4e8b\u4ef6\u4ea7\u751f\u4e8e\u96c6\u5408\u4e2d，\u6211\u4eec\u963b\u585e\u51fd\u6570\u5c31\u4f1a\u53bb\u6267\u884c\u76f8\u5e94\u7684\u4e8b\u4ef6，\u6267\u884c\u5b8c\u540e\u5c31\u53c8\u4f1a\u56de\u53bb\u7ee7\u7eed\u8fdb\u884c\u68c0\u9a8c\u662f\u5426\u6709\u5176\u4ed6\u4e8b\u4ef6\u4ea7\u751f\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a\u4ee5\u4e0b\u7684\u6846\u67b6<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f46\u4e0d\u540c\u7684 I\/O \u591a\u8def\u590d\u7528\u6280\u672f，\u5728\u5b9e\u73b0\u8fd9\u4e2a\u6846\u67b6\u65f6，\u6548\u7387\u548c\u673a\u5236\u5929\u5dee\u5730\u522b\u3002<\/p>\n \u53c2\u65701：\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d，\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a01<\/span><\/p>\n \u53c2\u65702\u3001\u53c2\u65703\u3001\u53c2\u65704：\u5206\u522b\u8868\u793a\u8bfb\u96c6\u5408\u3001\u5199\u96c6\u5408\u3001\u5f02\u5e38\u5904\u7406\u96c6\u5408\u7684\u8d77\u59cb\u5730\u5740<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u7531\u4e8e\u5bf9\u4e8e\u5199\u64cd\u4f5c\u800c\u8a00，\u6211\u4eec\u4e5f\u53ef\u4ee5\u8f6c\u6362\u8bfb\u64cd\u4f5c，\u6240\u4ee5，\u53ea\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u96c6\u5408\u5c31\u884c<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5bf9\u4e8e\u4e0d\u4f7f\u7528\u7684\u96c6\u5408\u800c\u8a00，\u76f4\u63a5\u586bNULL\u5373\u53ef<\/span><\/p>\n \u53c2\u65705：\u8d85\u65f6\u65f6\u95f4，\u5982\u679c\u586bNULL\u8868\u793a\u6c38\u4e45\u7b49\u5f85，\u5982\u679c\u60f3\u8981\u8bbe\u7f6e\u65f6\u95f4，\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u5982\u4e0b\u7ed3\u6784\u4f53\u7c7b\u578b \u7684\u53d8\u91cf，\u5e76\u5c06\u5730\u5740\u4f20\u9012\u8fdb\u53bb<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0struct timeval {<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long \u00a0 \u00a0tv_sec; \u00a0 \u00a0 \u00a0 \u00a0 \/* \u79d2\u6570 *\/ <\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long \u00a0 \u00a0tv_usec; \u00a0 \u00a0 \u00a0 \u00a0\/* \u5fae\u79d2 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 };<\/span><\/p>\n \u00a0 \u00a0 \u00a0 and<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0struct timespec {<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long \u00a0 \u00a0tv_sec; \u00a0 \u00a0 \u00a0 \u00a0 \/* \u79d2\u6570 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long \u00a0 \u00a0tv_nsec; \u00a0 \u00a0 \u00a0 \u00a0\/* \u7eb3\u79d2 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0\u00a0};<\/span><\/p>\n<\/td>\n<\/tr>\n >0:\u6210\u529f\u8fd4\u56de\u89e3\u9664\u672c\u6b21\u963b\u585e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570<\/span><\/p>\n =0:\u8868\u793a\u8bbe\u7f6e\u7684\u8d85\u65f6\u65f6\u95f4，\u65f6\u95f4\u5df2\u7ecf\u5230\u8fbe，\u4f46\u662f\u6ca1\u6709\u4e8b\u4ef6\u4e8b\u4ef6\u4ea7\u751f<\/span><\/p>\n =-1：\u8868\u793a\u5931\u8d25，\u7f6e\u4f4d\u9519\u8bef\u7801<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6ce8\u610f：\u5f53\u8be5\u51fd\u6570\u89e3\u9664\u963b\u585e\u65f6，\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d，\u5c31\u53ea\u5269\u4e0b\u672c\u6b21\u89e6\u53d1\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5176\u4f59\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u88ab\u5220\u9664\u4e86<\/p>\n \/\/\u4e13\u95e8\u9488\u5bf9\u4e8e\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u63d0\u4f9b\u7684\u51fd\u6570 \u00a0 \u00a0 \u00a0 \u00a0 \u5728\u5b9e\u73b0tcp\u5e76\u53d1\u670d\u52a1\u5668\u4e4b\u524d，\u6211\u4eec\u5148\u770b\u770bselect\u7684\u57fa\u672c\u7528\u6cd5：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u8be5\u9700\u8981\u6ce8\u610f\u7684\u70b9\u4ee3\u7801\u5757\u91cc\u4e5f\u5199\u4e86，\u5728\u6b64\u5c31\u4e0d\u8fc7\u591a\u8d58\u8ff0\u4e86\u3002<\/p>\n #include<iostream> int main(int argc, const char *argv[]) { \/\/2\u3001\u7ed1\u5b9aip\u5730\u5740\u548c\u7aef\u53e3\u53f7 \/\/2.2 \u7ed1\u5b9a\u5de5\u4f5c \/\/3\u3001\u542f\u52a8\u76d1\u542c \/\/4\u3001\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42 \/\/\u5b9a\u4e49\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408 while(1){ \/\/\u7a0b\u5e8f\u6267\u884c\u81f3\u6b64，\u8868\u793a\u4e00\u5b9a\u6709\u5176\u4e2d\u81f3\u5c11\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e86\u4e8b\u4ef6，\u53ea\u9700\u8981\u5224\u65ad\u54ea\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fd8 printf("[%s:%d]:\u5df2\u8fde\u63a5\u6210\u529f，newfd = %d!!!!\\\\n", } return 0; \u00a0 \u00a0 \u00a0 \u00a0 \u503c\u5f97\u4e00\u63d0\u7684\u662f\u6b64\u5904\u7684tempfds，\u6211\u4eec\u4e3a\u4ec0\u4e48\u9700\u8981\u5b9a\u4e49\u8fd9\u4e2atempfds，\u8981\u7406\u89e3\u4e3a\u4ec0\u4e48\u9700\u8981\u5b83，\u6211\u4eec\u5fc5\u987b\u5148\u4e86\u89e3\u00a0select\u00a0\u51fd\u6570\u7684\u4e00\u4e2a\u6838\u5fc3\u7279\u6027：\u201c\u7834\u574f\u6027\u201d<\/p>\n readfds：<\/p>\n tempfds：<\/p>\n #include<iostream> int main(int argc, const char *argv[]) return 0; \u00a0 \u00a0 \u00a0 \u00a0 \u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u670d\u52a1\u5668\u4f9d\u65e7\u662f\u53ef\u4ee5\u4e00\u5bf9\u591a\u7684<\/p>\n sfd = socket(); \/\/\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26 fd_set readfds, tempfds; \/\/\u5b9a\u4e49\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408 while(1) \/\/\u5224\u65ad\u76f8\u5173\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5728\u96c6\u5408\u4e2d \/\/\u5224\u65ad\u662f\u5426\u662f\u5ba2\u6237\u7aef\u53d1\u6765\u6570\u636e } \u53c2\u65701：\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u5bb9\u5668\u7684\u8d77\u59cb\u5730\u5740，\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53\u6570\u7ec4，\u7ed3\u6784\u4f53\u7c7b\u578b\u5982\u4e0b<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 struct pollfd {<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 int \u00a0 fd; \u00a0 \u00a0 \u00a0 \u00a0 \/* \u6587\u4ef6\u63cf\u8ff0\u7b26 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 short events; \u00a0 \u00a0 \/* \u8981\u7b49\u5f85\u7684\u4e8b\u4ef6：\u7531\u7528\u6237\u586b\u5199 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 short revents; \u00a0 \u00a0\/* \u5b9e\u9645\u53d1\u751f\u7684\u4e8b\u4ef6 ：\u8c03\u7528\u51fd\u6570\u7ed3\u675f\u540e，\u5185\u6838\u4f1a\u81ea\u52a8\u8bbe\u7f6e*\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 };<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u5173\u4e8e\u4e8b\u4ef6\u5bf9\u5e94\u7684\u4f4d：<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0POLLIN:\u8bfb\u4e8b\u4ef6<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 POLLOUT：\u5199\u4e8b\u4ef6<\/span><\/p>\n \u53c2\u65702：\u96c6\u5408\u4e2d\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570<\/span><\/p>\n \u53c2\u65703：\u8d85\u65f6\u65f6\u95f4，\u8d1f\u6570\u8868\u793a\u6c38\u4e45\u7b49\u5f85，0\u8868\u793a\u975e\u963b\u585e<\/span><\/p>\n<\/td>\n<\/tr>\n >0:\u8868\u793a\u89e6\u53d1\u672c\u6b21\u89e3\u9664\u963b\u585e\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570<\/span><\/p>\n =0:\u8868\u793a\u8d85\u65f6<\/span><\/p>\n =-1:\u51fa\u9519，\u7f6e\u4f4d\u9519\u8bef\u7801<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u00a0 \u00a0 \u00a0 \u00a0 \u8001\u5199\u670d\u52a1\u5668\u4e5f\u4e0d\u597d，\u8fd9\u6b21\u6211\u4eec\u7528poll\u5b8c\u6210TCP\u5ba2\u6237\u7aef\u4e2d\u53d1\u9001\u6570\u636e\u548c\u8bfb\u53d6\u6570\u636e\u7684\u5e76\u53d1，\u518d\u642d\u914d\u4e0a\u6211\u4eec\u521a\u624dselect\u5199\u7684\u670d\u52a1\u5668\u3002<\/p>\n #include<iostream> \/\/ 2\u3001\u7ed1\u5b9aip\u4e0e\u7aef\u53e3\u53f7(\u53ef\u9009)<\/p>\n struct sockaddr_in cin; if(bind(cfd, (struct sockaddr*)&cin, sizeof(cin)) == -1){ \/\/ 3\u3001\u94fe\u63a5\u670d\u52a1\u5668 if(connect(cfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){ \/\/ \u4f7f\u7528poll\u5b8c\u6210\u7ec8\u7aef\u8f93\u5165\u548c\u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u7684\u5e76\u53d1\u6267\u884c pfds[1].fd = cfd; \/\/ \u68c0\u6d4bcfd\u6587\u4ef6\u63cf\u8ff0\u7b26 \/\/ \u7a0b\u5e8f\u6267\u884c\u81f3\u6b64，\u8868\u793a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bb9\u5668\u4e2d，\u6709\u4e8b\u4ef6\u4ea7\u751f if(send(cfd, wbuf, sizeof(wbuf), 0) == -1){ if(pfds[1].revents == POLLIN){ \/\/ 5\u3001\u5173\u95ed\u5957\u63a5\u5b57 return 0; \u00a0 \u00a0 \u00a0 \u00a0 \u6b64\u5904\u6211\u4eec\u6765\u9a8c\u8bc1\u4e00\u6ce2，\u770b\u56fe\u5373\u53ef<\/p>\n 1\u3001select\u7ba1\u7406\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408，poll\u53ea\u7ba1\u7406\u4e00\u4e2a，\u4f46\u662f，\u53ef\u4ee5\u64cd\u4f5c\u5f88\u591a\u4e8b\u4ef6<\/p>\n<\/p>\n 2\u3001select\u7ba1\u7406\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u4e0a\u9650，\u4e00\u822c\u662f1024\u4e2a，\u800cpoll\u7ba1\u7406\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ca1\u6709\u8fd9\u4e2a\u9650\u5236<\/span><\/p>\n<\/p>\n 3\u3001\u5bf9\u4e8e\u6548\u7387\u800c\u8a00，poll\u7684\u6548\u7387\u6bd4select\u7684\u7565\u9ad8<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0epoll\u5168\u79f0\u4e3aeventpoll，\u662f\u5185\u6838\u5b9e\u73b0IO\u591a\u8def\u590d\u7528\u7684\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002\u5728\u5176\u4e2d\u4e00\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u7684\u5230 \u6ee1\u8db3\u65f6，\u53ef\u4ee5\u89e3\u9664\u963b\u585e\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0epoll\u662fselect\u548cpoll\u7684\u5347\u7ea7\u7248，\u76f8\u6bd4\u4e8eselect\u548cpoll\u800c\u8a00，epoll\u6539\u8fdb\u4e86\u5de5\u4f5c\u65b9\u5f0f，\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n 1\u3001sellect\u548cpoll\u90fd\u662f\u57fa\u4e8e\u7ebf\u6027\u7ed3\u6784\u8fdb\u884c\u68c0\u6d4b\u96c6\u5408，\u800cepoll\u662f\u57fa\u4e8e\u6811\u5f62\u7ed3\u6784（\u7ea2\u9ed1\u6811）<\/span>\u5b8c\u6210\u7ba1\u7406\u68c0\u6d4b\u96c6\u5408\u7684<\/p>\n<\/p>\n 2\u3001select\u548cpoll\u68c0\u6d4b\u65f6，\u968f\u7740\u96c6\u5408\u7684\u589e\u5927，\u6548\u7387\u4f1a\u8d8a\u6765\u8d8a\u4f4e\u3002epoll\u4f7f\u7528\u7684\u662f\u51fd\u6570\u56de\u8c03\u673a\u5236，\u6548\u7387\u8f83\u9ad8\u3002\u5904\u7406\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6548\u7387\u4e5f\u4e0d\u4f1a\u968f\u7740\u6587\u4ef6\u79d2\u6570\u7684\u589e\u5927\u800c\u964d\u4f4e\u3002<\/p>\n<\/p>\n 3\u3001select\u548cpoll\u5728\u5de5\u4f5c\u8fc7\u7a0b\u4e2d，\u4e0d\u65ad\u7684\u5728\u5185\u6838\u7a7a\u95f4\u4e0e\u7528\u6237\u7a7a\u95f4\u9891\u7e41\u62f7\u8d1d\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u636e\u3002epoll\u5728\u6ce8\u518c\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6216\u8005\u4fee\u6539\u6587\u4ef6\u63cf\u8ff0\u7b26\u65f6，\u53ea\u9700\u8fdb\u884c\u4e00\u6b21，\u80fd\u591f\u6709\u6548\u51cf\u5c11\u6570\u636e\u5728\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u4e4b\u95f4\u7684\u5207\u6362<\/p>\n<\/p>\n 4\u3001\u548cpoll\u4e00\u6837，epoll\u6ca1\u6709\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u9650\u5236，\u4ec5\u4ec5\u6536\u5230\u7a0b\u5e8f\u80fd\u591f\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u9650\u5236<\/p>\n<\/p>\n 5\u3001\u5bf9\u4e8eselect\u548cpoll\u800c\u8a00，\u9700\u8981\u5bf9\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u8fdb\u884c\u5224\u65ad\u540e\u624d\u77e5\u9053\u65f6\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e86，\u800cepoll\u53ef\u4ee5\u76f4\u63a5\u5f97\u5230\u5df2\u7ecf\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u65e0\u9700\u518d\u6b21\u68c0\u6d4b<\/p>\n<\/p>\n 6\u3001\u5f53\u591a\u8def\u590d\u7528\u6bd4\u8f83\u9891\u53d1\u8fdb\u884c\u3001IO\u6d41\u91cf\u9891\u7e41\u7684\u65f6\u5019，\u4e00\u822c\u4e0d\u4f7f\u7528select\u548cpoll，\u4f7f\u7528epoll\u6bd4\u8f83\u5408\u9002<\/span><\/p>\n<\/p>\n 7\u3001epoll\u53ea\u9002\u7528\u4e8elinux\u5e73\u53f0，\u4e0d\u80fd\u8de8\u5e73\u53f0\u64cd\u4f5c<\/p>\n 1\u3001\u521b\u5efaepoll\u5b9e\u4f8b<\/span><\/p>\n 2\u3001\u63a7\u5236epoll\u5b9e\u4f8b<\/span><\/p>\n \u53c2\u65701：\u901a\u8fc7epoll_create\u521b\u5efa\u7684epoll\u5b9e\u4f8b\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n \u53c2\u65702：op\u8868\u793a\u8981\u8fdb\u884c\u7684\u64cd\u4f5c<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 EPOLL_CTL_ADD：\u5411epoll\u6811\u4e0a\u6dfb\u52a0\u65b0\u7684\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 EPOLL_CTL_MOD：\u6539\u53d8epoll\u6811\u4e0a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u68c0\u6d4b\u7684\u4e8b\u4ef6<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0EPOLL_CTL_DEL：\u5220\u9664epoll\u6811\u4e0a\u7684\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26,\u6b64\u65f6\u53c2\u65703\u53ef\u4ee5\u7701\u7565\u586bNULL<\/span><\/p>\n \u53c2\u65703：\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n \u53c2\u65704：\u8981\u68c0\u6d4b\u7684\u4e8b\u4ef6，\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53\u53d8\u91cf\u5730\u5740，\u5c5e\u4e8e\u8f93\u5165\u53d8\u91cf<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0typedef union epoll_data {<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 void \u00a0 \u00a0 \u00a0 \u00a0*ptr; \u00a0 \u00a0 \u00a0 \u00a0\/\/\u63d0\u4f9b\u7684\u89e3\u91ca\u6027\u6570\u636e<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 int \u00a0 \u00a0 \u00a0 \u00a0 \u00a0fd; \u00a0 \u00a0 \u00a0 \/\/\u6587\u4ef6\u63cf\u8ff0\u7b26（\u5e38\u7528）<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 uint32_t \u00a0 \u00a0 u32;<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 uint64_t \u00a0 \u00a0 u64;<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0} epoll_data_t;<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0struct epoll_event {<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 uint32_t \u00a0 \u00a0 events; \u00a0 \u00a0 \u00a0\/* \u8981\u68c0\u6d4b\u7684\u4e8b\u4ef6 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 epoll_data_t data; \u00a0 \u00a0 \u00a0 \u00a0\/* \u7528\u6237\u6709\u6548\u6570\u636e，\u662f\u4e00\u4e2a\u5171\u7528\u4f53 *\/<\/span><\/p>\n \u00a0 \u00a0 \u00a0\u00a0 \u00a0 };<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8981\u68c0\u6d4b\u7684\u4e8b\u4ef6：<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 EPOLLIN：\u8bfb\u4e8b\u4ef6<\/span><\/p>\n \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 EPOLLOUT：\u5199\u4e8b\u4ef6<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 EPOLLERR：\u5f02\u5e38\u4e8b\u4ef6<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 EPOLLET：\u8868\u793a\u8bbe\u7f6eepoll\u7684\u6a21\u5f0f\u4e3a\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f<\/span><\/p>\n<\/td>\n<\/tr>\n 3\u3001\u963b\u585e\u68c0\u6d4bepoll\u5b9e\u4f8b<\/p>\n \u53c2\u65701：epoll\u5b9e\u4f8b\u5bf9\u4e8e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n \u53c2\u65702：\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408，\u5f53\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e8b\u4ef6\u65f6，\u5c06\u6240\u6709\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u653e\u5165\u5230\u8be5\u96c6\u5408\u4e2d<\/span><\/p>\n \u53c2\u65703：\u53c2\u65702\u7684\u5927\u5c0f<\/span><\/p>\n \u53c2\u65704：\u8d85\u65f6\u65f6\u95f4，\u4ee5\u6beb\u79d2\u4e3a\u5355\u4f4d\u7684\u8d85\u65f6\u65f6\u95f4，\u5982\u679c\u586b-1\u8868\u793a\u6c38\u4e45\u963b\u585e<\/span><\/p>\n<\/td>\n<\/tr>\n >0:\u8868\u793a\u89e3\u9664\u672c\u6b21\u64cd\u4f5c\u7684\u89e6\u53d1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<\/span><\/p>\n =0：\u8868\u793a\u8d85\u65f6，\u4f46\u662f\u6ca1\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e8b\u4ef6<\/span><\/p>\n =-1：\u5931\u8d25，\u7f6e\u4f4d\u9519\u8bef\u7801<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n #include<iostream> int main(int argc, const char *argv[]){ struct sockaddr_in sin; if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){ struct sockaddr_in cin; \/\/ \u521b\u5efaepoll\u5b9e\u4f8b，\u7528\u4e8e\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26 \/\/ \u5c06sfd\u653e\u5165\u5230\u68c0\u6d4b\u96c6\u5408\u4e2d \/\/ \u5b9a\u4e49\u63a5\u6536\u8fd4\u56de\u7684\u4e8b\u4ef6\u96c6\u5408 while(1){ \/\/ \u5faa\u73af\u904d\u5386\u96c6\u5408，\u5224\u65ad\u662f\u54ea\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea \/\/ \u5224\u65ad\u662f\u5426\u4e3asfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea \/\/ \u5c06\u5ba2\u6237\u7aef\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u5230epoll\u68c0\u6d4b\u96c6\u5408\u4e2d strcat(rbuf, "*_*"); return 0; 1\u3001sfd = socket(); \/\/\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 5\u3001\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5c31\u7eea（\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42） 6\u3001\u5982\u679c\u68c0\u6d4b\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea，\u5219\u5efa\u7acb\u8fde\u63a5，\u5c06newfd\u653e\u5165\u5230\u96c6\u5408\u4e2d 7\u3001\u5982\u679c\u68c0\u6d4b\u7684\u662f\u5ba2\u6237\u7aef\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5219\u8fdb\u884c\u901a\u4fe1，\u5982\u679c\u5ba2\u6237\u7aef\u4e0b\u7ebf，\u5219\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u5220\u9664 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0epoll\u7684\u5de5\u4f5c\u6a21\u5f0f\u6709\u4e24\u79cd，\u5206\u522b\u662f\u6c34\u5e73\u89e6\u53d1\u548c\u8fb9\u6cbf\u89e6\u53d1<\/p>\n 1\u3001\u6c34\u5e73\u6a21\u5f0f：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7b80\u79f0LT\u6a21\u5f0f（level trigered）<\/span>,\u662f\u9ed8\u8ba4\u7684\u4e00\u79cd\u521d\u59cb\u6a21\u5f0f，\u5e76\u4e14\u8be5\u6a21\u5f0f\u652f\u6301\u963b\u585e\u548c\u975e\u963b\u585e\u7684\u5f62\u5f0f<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b，\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u51c6\u5907\u5c31\u7eea\u540e，\u5185\u6838\u4f1a\u901a\u77e5\u4f7f\u7528\u8005\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e86\u3002\u4f7f\u7528\u8005\u53ef\u4ee5\u5bf9\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u4f7f\u7528\u8005\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c\u6216\u8005\u6ca1\u6709\u5168\u90e8\u5904\u7406\u5b8c\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4fe1\u606f，\u5185\u6838\u4f1a\u7ee7\u7eed\u901a\u77e5\u4f7f\u7528\u8005\u5904\u7406\u6570\u636e<\/span><\/p>\n<\/p>\n \u7279\u70b9：<\/span><\/p>\n \u5bf9\u4e8e\u8bfb\u4e8b\u4ef6：\u5982\u679c\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u7684\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u6ca1\u6709\u88ab\u8bfb\u53d6\u5b8c\u6bd5，\u5219\u5185\u6838\u4f1a\u7ee7\u7eed\u89e3\u9664\u963b\u585e，\u8ba9\u7528\u6237\u7ee7\u7eed\u5904\u7406，\u76f4\u5230\u7f13\u51b2\u533a\u4e2d\u6ca1\u6709\u6570\u636e\u53ef\u4ee5\u5904\u7406\u4e3a\u6b62\u3002<\/p>\n<\/li>\n<\/ul>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u540e\u9762\u7684\u89e3\u9664\u963b\u585e，\u662f\u81ea\u52a8\u5b8c\u6210\u7684，\u65e0\u9700\u7528\u6237\u8fdb\u884c\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u540e\u7eed\u64cd\u4f5c\u3002<\/p>\n \u800c\u5bf9\u4e8e\u5199\u4e8b\u4ef6：\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7f13\u51b2\u533a\u662f\u5426\u53ef\u4ee5，\u5982\u679c\u53ef\u7528\u5219\u89e3\u9664\u963b\u585e，\u4e00\u822c\u5199\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u7f13\u51b2\u533a\u90fd\u662f\u53ef\u4ee5\u7684，\u4e00\u822c\u4e0d\u5bf9\u5199\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u68c0\u6d4b<\/p>\n<\/li>\n<\/ul>\n 2\u3001\u8fb9\u7f18\u6a21\u5f0f：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7b80\u79f0<\/span>
\nTCP\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5f15\u5165<\/h2>\n
\u4e00\u3001\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u5e76\u53d1？<\/h3>\n
\n
\n\u4e8c\u3001\u591a\u8fdb\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\nusing namespace std;
\n#define SER_PORT 8888
\n#define SER_IP "192.168.160.129"<\/p>\n
\n if(signo == SIGCHLD){
\n while(waitpid(-1, NULL, WNOHANG) > 0); \/\/ \u5faa\u73af\u975e\u963b\u585e\u56de\u6536\u50f5\u5c38\u8fdb\u7a0b
\n }
\n}<\/p>\n
\n \/\/ \u5bf9\u4e8e\u4e0b\u65b9\u56de\u6536\u5b50\u8fdb\u7a0b\u8d44\u6e90\u7684\u89e3\u51b3\u65b9\u6848
\n \/\/ \u6211\u4eec\u53ef\u4ee5\u5c06\u5b50\u4fe1\u53f7\u53d1\u9001\u7684SIGCHLD\u4fe1\u53f7\u8fde\u63a5\u5230\u81ea\u5b9a\u4e49\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4e2d
\n if(signal(SIGCHLD, handler) == SIG_ERR){
\n perror("signal error");
\n return -1;
\n }<\/p>\n
\n int sfd = socket(AF_INET, SOCK_STREAM, 0);
\n if(sfd == -1){
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success sfd = %d\\\\n", sfd);<\/p>\n
\n struct sockaddr_in sin;
\n sin.sin_family = AF_INET;
\n \/\/ \u6b64\u5904\u7ed1\u5b9a\u6570\u5b57\u90fd\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f
\n sin.sin_port = htons(SER_PORT);
\n sin.sin_addr.s_addr = inet_addr(SER_IP);<\/p>\n
\n perror("bind error");
\n return -1;
\n }
\n printf("bind success\\\\n");<\/p>\n
\n if(listen(sfd, 128) == -1){
\n perror("listen error");
\n return -1;
\n }
\n printf("listen success\\\\n");<\/p>\n
\n struct sockaddr_in cin;
\n socklen_t socklen = sizeof(cin);
\n while(1){
\n int newfd = accept(sfd, (struct sockaddr*)&cin, &socklen);
\n if(newfd == -1){
\n perror("accept error");
\n return -1;
\n }
\n printf("[%s:%d]:\u5df2\u8fde\u63a5\u6210\u529f!!!\\\\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));<\/p>\n
\n pid_t pid = fork();
\n if(pid > 0){
\n \/\/ wait(NULL); \u4e0d\u53ef\u4ee5\u4f7f\u7528\u8be5\u79cd\u65b9\u5f0f，\u56e0\u4e3a\u662f\u963b\u585e\u56de\u6536，\u6ca1\u6709\u5b50\u8fdb\u7a0b\u9000\u51fa\u65f6，\u5c31\u4f1a\u4e00\u76f4\u5728\u6b64\u5904\u963b\u585e
\n \/\/ \u90a3\u6b64\u65f6\u6211\u4eec\u4e3b\u8fdb\u7a0b\u5c31\u6ca1\u529e\u6cd5\u7ee7\u7eed\u8fde\u63a5\u66f4\u591a\u7684\u5ba2\u6237\u7aef\u4e86，\u76f8\u5f53\u4e8e\u7ed9\u6211\u4eec\u5faa\u73af\u670d\u52a1\u5668\u7a7f\u4e86\u4e2a\u5185\u88e4
\n \/\/ \u5565\u4e8b\u90fd\u6ca1\u5e72，\u540c\u6837\u975e\u963b\u585ewaitpid(-1, NULL, WNOHANG)\u4e5f\u662f\u4e0d\u884c\u7684，\u5982\u679c\u6211\u4eec\u5ba2\u6237\u7aef\u5df2\u7ecf\u7ed3\u675f\u4e86，
\n \/\/ \u4f46\u6211\u4eec\u4e3b\u7ebf\u7a0b\u8fd8\u5728accept\u5904\u963b\u585e，\u6b64\u65f6\u5b50\u8fdb\u7a0b\u8d44\u6e90\u8fd8\u662f\u6ca1\u529e\u6cd5\u56de\u6536<\/p>\n
\n close(newfd);
\n }else if(pid == 0){
\n \/\/ 5\u3001\u6570\u636e\u6536\u53d1
\n close(sfd);
\n char rbuf[128] = "";
\n while(1){
\n bzero(rbuf, sizeof(rbuf));
\n if(recv(newfd, rbuf, sizeof(rbuf), 0) == 0){
\n printf("\u5bf9\u7aef\u5df2\u4e0b\u7ebf\\\\n");
\n break;
\n }
\n printf("[%s:%d]:%s\\\\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), rbuf);
\n strcat(rbuf, "*_*");
\n if(send(newfd, rbuf, strlen(rbuf), 0) == -1){
\n perror("send error");
\n return -1;
\n }
\n printf("send success\\\\n");
\n }
\n close(newfd);
\n exit(EXIT_SUCCESS);
\n }else{
\n perror("fork error");
\n return -1;
\n }
\n }<\/p>\n
\n close(sfd);<\/p>\n
\n} <\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144455-6a637a6714537.png\")
<\/p>\n\u00a0📖\u00a0\u4f18\u70b9<\/h4>\n
\n
\u00a0📖\u00a0\u7f3a\u70b9<\/h4>\n
\n
\u00a0📖 \u6a21\u578b\u603b\u7ed3<\/h4>\n
\n while(waitpid() > 0); \/\/\u4ee5\u975e\u963b\u585e\u5f62\u5f0f\u56de\u6536\u50f5\u5c38\u8fdb\u7a0b
\n}<\/p>\n
\nsfd = socket(); \/\/\u521b\u5efa\u7528\u4e8e\u94fe\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\nbind(); \/\/\u7ed1\u5b9aip\u5730\u5740\u548c\u7aef\u53e3\u53f7
\nlisten(); \/\/\u542f\u52a8\u88ab\u52a8\u76d1\u542c\u72b6\u6001<\/p>\n
\n newfd = accept(); \/\/\u963b\u585e\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/p>\n
\n if(pid > 0){
\n \/\/\u5173\u95ednewfd
\n close(newfd);
\n }
\n else if(pid == 0){
\n \/\/\u5b50\u8fdb\u7a0b
\n close(sfd);
\n \/\/\u8ddf\u5ba2\u6237\u7aef\u8fdb\u884c\u6570\u636e\u6536\u53d1
\n recv();
\n send();
\n close(newfd);<\/p>\n
\n }<\/p>\n
\nclose(sfd); <\/p>\n
\n\u4e09\u3001\u591a\u7ebf\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <pthread.h>
\nusing namespace std;
\n#define SER_PORT 8888
\n#define SER_IP "192.168.160.129"<\/p>\n
\n int newfd;
\n struct sockaddr_in cin;
\n};<\/p>\n
\n \/\/ \u89e3\u6790\u4f20\u8fc7\u6765\u7684\u53c2\u6570
\n int newfd = ((struct Info*)arg)->newfd;
\n struct sockaddr_in cin = ((struct Info*)arg)->cin;<\/p>\n
\n char rbuf[128] = "";
\n while(1){
\n bzero(rbuf, sizeof(rbuf));
\n int res = recv(newfd, rbuf, sizeof(rbuf), 0);
\n if(res == 0){
\n printf("\u5bf9\u7aef\u5df2\u4e0b\u7ebf\\\\n");
\n break;
\n }
\n printf("[%s:%d]:%s\\\\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), rbuf);
\n strcat(rbuf, "*_*");
\n if(send(newfd, rbuf, strlen(rbuf), 0) == -1){
\n perror("send error");
\n return NULL;
\n }
\n printf("send success\\\\n");
\n }
\n close(newfd);
\n pthread_exit(NULL);
\n}<\/p>\n
\n \/\/ 1\u3001\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int sfd = socket(AF_INET, SOCK_STREAM, 0);
\n if(sfd == -1){
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success sfd = %d\\\\n", sfd);<\/p>\n
\n struct sockaddr_in sin;
\n sin.sin_family = AF_INET;
\n \/\/ \u6b64\u5904\u7ed1\u5b9a\u6570\u5b57\u90fd\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f
\n sin.sin_port = htons(SER_PORT);
\n sin.sin_addr.s_addr = inet_addr(SER_IP);<\/p>\n
\n perror("bind error");
\n return -1;
\n }
\n printf("bind success\\\\n");<\/p>\n
\n if(listen(sfd, 128) == -1){
\n perror("listen error");
\n return -1;
\n }
\n printf("listen success\\\\n");<\/p>\n
\n struct sockaddr_in cin;
\n socklen_t socklen = sizeof(cin);
\n while(1){
\n \/\/ \u5bf9accept\u800c\u8a00，\u7a0b\u5e8f\u8fd0\u884c\u5230\u6b64\u5904\u65f6,
\n \/\/ \u4f1a\u7ed9\u5f53\u524d\u5ba2\u6237\u7aef\u9884\u5206\u914d\u4e00\u4e2a\u6700\u5c0f\u672a\u88ab\u4f7f\u7528\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u540e\u671f\u518d\u6709\u65b0\u7684\u66f4\u5c0f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e5f\u518d\u4e0d\u4f7f\u7528\u4e86，\u65b0\u7684\u6700\u5c0f\u7684\u7528\u4e8e\u4e0b\u4e00\u6b21\u5ba2\u6237\u7aef\u7684\u9009\u5b9a
\n int newfd = accept(sfd, (struct sockaddr*)&cin, &socklen);
\n if(newfd == -1){
\n perror("accept error");
\n return -1;
\n }
\n printf("[%s:%d]:\u5df2\u8fde\u63a5\u6210\u529f!!!\\\\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));<\/p>\n
\n if(pthread_create(&tid, NULL, deal_cli_msg, &buf) != 0){
\n printf("pthread_create error\\\\n");
\n return -1;
\n }
\n \/\/ \u56de\u6536\u8d44\u6e90
\n pthread_detach(tid);
\n }<\/p>\n
\n close(sfd);<\/p>\n
\n} <\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144456-6a637a6850321.png\")
<\/p>\n\u00a0📖\u00a0\u4f18\u70b9<\/h4>\n
\n
\u00a0📖\u00a0\u7f3a\u70b9<\/h4>\n
\n
\u00a0📖 \u6a21\u578b\u603b\u7ed3<\/h4>\n
\nvoid *deal_cli_msg(void *arg){
\n \/\/\u8ddf\u5ba2\u6237\u7aef\u8fdb\u884c\u6570\u636e\u6536\u53d1
\n recv();
\n send();
\n close(newfd);
\n \/\/\u9000\u51fa\u7ebf\u7a0b
\n pthread_exit(NULL);
\n}<\/p>\n
\nsfd = socket(); \/\/\u521b\u5efa\u7528\u4e8e\u94fe\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\nbind(); \/\/\u7ed1\u5b9aip\u5730\u5740\u548c\u7aef\u53e3\u53f7
\nlisten(); \/\/\u542f\u52a8\u88ab\u52a8\u76d1\u542c\u72b6\u6001<\/p>\n
\n newfd = accept(); \/\/\u963b\u585e\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/p>\n
\n pthread_detach(tid);
\n}
\nclose(sfd); <\/p>\n
\nI\/O\u591a\u8def\u590d\u7528<\/h2>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144457-6a637a6995cfc.png\")
<\/p>\n
\n\u4e00\u3001IO\u591a\u8def\u590d\u7528\u4e4bselect<\/h3>\n
\u00a0📖\u00a0select\u51fd\u6570<\/h4>\n
\n\n
\n \u51fd\u6570\u539f\u578b<\/td>\n int select(int nfds, fd_set *readfds, fd_set *writefds,fd_set *exceptfds, struct timeval *timeout);<\/span><\/span><\/td>\n<\/tr>\n \n \u5934\u6587\u4ef6<\/td>\n sys\/select.h<\/td>\n<\/tr>\n \n \u529f\u80fd<\/td>\n \u963b\u585e\u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u662f\u5426\u6709\u4e8b\u4ef6\u4ea7\u751f，\u5982\u679c\u6709\u4e8b\u4ef6\u4ea7\u751f，\u5219\u89e3\u9664\u963b\u585e<\/span><\/td>\n<\/tr>\n \n \u53c2\u6570\u8bf4\u660e<\/td>\n \n \n \u8fd4\u56de\u503c<\/td>\n \n
\n void FD_CLR(int fd, fd_set *set); \/\/\u5c06fd\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u5bb9\u5668set\u4e2d\u5220\u9664
\n int FD_ISSET(int fd, fd_set *set); \/\/\u5224\u65adfd\u6587\u4ef6\u63cf\u8ff0\u7b26，\u662f\u5426\u5b58\u5728\u4e8eset\u5bb9\u5668\u4e2d
\n void FD_SET(int fd, fd_set *set); \/\/\u5c06fd\u6587\u4ef6\u63cf\u8ff0\u7b26，\u653e\u5165\u5230set\u5bb9\u5668\u4e2d
\n void FD_ZERO(fd_set *set); \/\/\u6e05\u7a7aset\u5bb9\u5668 <\/p>\n
\n\u00a0📖\u00a0select\u7684\u57fa\u672c\u7528\u6cd5<\/h4>\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <sys\/select.h>
\nusing namespace std;
\n#define SER_PORT 8888 \/\/\u670d\u52a1\u5668\u7aef\u53e3\u53f7
\n#define SER_IP "192.168.31.49" \/\/\u670d\u52a1\u5668IP\u5730\u5740<\/p>\n
\n \/\/1\u3001\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int sfd = socket(AF_INET, SOCK_STREAM, 0);
\n \/\/\u53c2\u65701：AF_INET\u8868\u793a\u4f7f\u7528\u7684\u662fipv4\u7684\u901a\u4fe1\u534f\u8bae
\n \/\/\u53c2\u65702：SOCK_STREAM\u8868\u793a\u4f7f\u7528\u7684\u662ftcp\u901a\u4fe1
\n \/\/\u53c2\u65703：\u7531\u4e8e\u53c2\u65702\u6307\u5b9a\u4e86\u534f\u8bae，\u53c2\u65703\u586b0\u5373\u53ef
\n if(sfd == -1){
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success sfd = %d\\\\n", sfd);<\/p>\n
\n \/\/2.1 \u586b\u5145\u8981\u7ed1\u5b9a\u7684ip\u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ed3\u6784\u4f53
\n struct sockaddr_in sin;
\n sin.sin_family = AF_INET; \/\/\u901a\u4fe1\u57df
\n sin.sin_port = htons(SER_PORT); \/\/\u7aef\u53e3\u53f7
\n sin.sin_addr.s_addr = inet_addr(SER_IP); \/\/ip\u5730\u5740<\/p>\n
\n \/\/\u53c2\u65701：\u8981\u88ab\u7ed1\u5b9a\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/\u53c2\u65702：\u8981\u7ed1\u5b9a\u7684\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53，\u9700\u8981\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362，\u9632\u6b62\u8b66\u544a
\n \/\/\u53c2\u65703：\u53c2\u65702\u7684\u5927\u5c0f
\n if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) ==-1){
\n perror("bind error");
\n return -1;
\n }
\n printf("bind success\\\\n");<\/p>\n
\n \/\/\u53c2\u65701：\u8981\u542f\u52a8\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/\u53c2\u65702：\u6302\u8d77\u961f\u5217\u7684\u957f\u5ea6
\n if(listen(sfd, 128) ==-1){
\n perror("listen error");
\n return -1;
\n }
\n printf("listen success\\\\n");<\/p>\n
\n \/\/\u5b9a\u4e49\u53d8\u91cf，\u7528\u4e8e\u63a5\u53d7\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53
\n struct sockaddr_in cin; \/\/\u7528\u4e8e\u63a5\u6536\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u7684
\n socklen_t socklen = sizeof(cin); \/\/\u7528\u4e8e\u63a5\u6536\u5730\u5740\u4fe1\u606f\u7684\u957f\u5ea6<\/p>\n
\n fd_set readfds, tempfds; \/\/\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408
\n \/\/\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u6e05\u7a7a
\n FD_ZERO(&readfds);
\n \/\/\u5c060\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ee5\u53casfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u5230\u96c6\u5408\u4e2d
\n FD_SET(0, &readfds);
\n FD_SET(sfd, &readfds);<\/p>\n
\n \/\/\u5c06reafds\u5907\u4efd\u4e00\u4efd\u653e\u5165tempfds\u4e2d
\n tempfds = readfds;
\n \/\/\u8c03\u7528\u963b\u585e\u51fd\u6570，\u5b8c\u6210\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u7ba1\u7406\u5de5\u4f5c
\n int res = select(sfd+1, &tempfds, NULL, NULL, NULL);
\n if(res == -1){
\n perror("select error");
\n return -1;
\n }else if(res == 0){
\n printf("time out !!!\\\\n");
\n return -1;
\n }<\/p>\n
\n\u5728\u96c6\u5408\u4e2d
\n \/\/\u5c31\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e86\u4e8b\u4ef6
\n \/\/\u8868\u793asfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u89e6\u53d1\u4e86\u4e8b\u4ef6
\n if(FD_ISSET(sfd, &tempfds)){
\n int newfd = accept(sfd, (struct sockaddr *)&cin, &socklen);
\n \/\/\u53c2\u65701：\u670d\u52a1\u5668\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/\u53c2\u65702：\u7528\u4e8e\u63a5\u6536\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u7684\u5bb9\u5668，\u5982\u679c\u4e0d\u63a5\u6536，\u4e5f\u53ef\u4ee5\u586bNULL
\n \/\/\u53c2\u65703：\u63a5\u6536\u53c2\u65702\u7684\u5927\u5c0f，\u5982\u679c\u53c2\u65702\u4e3aNULL，\u5219\u53c2\u65703\u4e5f\u662fNULL
\n if(newfd == -1){
\n perror("accept error");
\n return -1;
\n }<\/p>\n
\n inet_ntoa(cin.sin_addr),
\n ntohs(cin.sin_port), newfd);
\n }
\n \/\/\u5224\u65ad0\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u4ea7\u751f\u4e86\u4e8b\u4ef6
\n if(FD_ISSET(0, &tempfds)){
\n char wbuf[128] = ""; \/\/\u5b57\u7b26\u6570\u7ec4
\n fgets(wbuf, sizeof(wbuf), stdin); \/\/\u4ece\u7ec8\u7aef\u8bfb\u53d6\u6570\u636e,\u963b\u585e\u51fd\u6570
\n printf("\u89e6\u53d1\u4e86\u952e\u76d8\u8f93\u5165\u4e8b\u4ef6：%s\\\\n", wbuf);
\n }<\/p>\n
\n close(sfd);<\/p>\n
\n} <\/p>\n
\n\u00a0📖\u00a0select\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h4>\n
\n
\n
\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <sys\/select.h>
\nusing namespace std;
\n#define SER_PORT 8888
\n#define SER_IP "192.168.160.129"<\/p>\n
\n{
\n \/\/ 1\u3001\u521b\u5efa\u7528\u4e8e\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int sfd = socket(AF_INET, SOCK_STREAM, 0);
\n \/\/ \u53c2\u65701：AF_INET\u8868\u793a\u4f7f\u7528\u7684\u662fipv4\u7684\u901a\u4fe1\u534f\u8bae
\n \/\/ \u53c2\u65702：SOCK_STREAM\u8868\u793a\u4f7f\u7528\u7684\u662ftcp\u901a\u4fe1
\n \/\/ \u53c2\u65703：\u7531\u4e8e\u53c2\u65702\u6307\u5b9a\u4e86\u534f\u8bae，\u53c2\u65703\u586b0\u5373\u53ef
\n if (sfd == -1)
\n {
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success sfd = %d\\\\n", sfd); \/\/ 3
\n \/\/ 2\u3001\u7ed1\u5b9aip\u5730\u5740\u548c\u7aef\u53e3\u53f7
\n \/\/ 2.1 \u586b\u5145\u8981\u7ed1\u5b9a\u7684ip\u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ed3\u6784\u4f53
\n struct sockaddr_in sin;
\n sin.sin_family = AF_INET; \/\/ \u901a\u4fe1\u57df
\n sin.sin_port = htons(SER_PORT); \/\/ \u7aef\u53e3\u53f7
\n sin.sin_addr.s_addr = inet_addr(SER_IP); \/\/ ip\u5730\u5740
\n \/\/ 2.2 \u7ed1\u5b9a\u5de5\u4f5c
\n \/\/ \u53c2\u65701：\u8981\u88ab\u7ed1\u5b9a\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65702：\u8981\u7ed1\u5b9a\u7684\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53，\u9700\u8981\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362，\u9632\u6b62\u8b66\u544a
\n \/\/ \u53c2\u65703：\u53c2\u65702\u7684\u5927\u5c0f
\n if (bind(sfd, (struct sockaddr *)&sin, sizeof(sin)) == -1)
\n {
\n perror("bind error");
\n return -1;
\n }
\n printf("bind success\\\\n");
\n \/\/ 3\u3001\u542f\u52a8\u76d1\u542c
\n \/\/ \u53c2\u65701：\u8981\u542f\u52a8\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65702：\u6302\u8d77\u961f\u5217\u7684\u957f\u5ea6
\n if (listen(sfd, 128) == -1)
\n {
\n perror("listen error");
\n return -1;
\n }
\n printf("listen success\\\\n");
\n \/\/ 4\u3001\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42
\n \/\/ \u5b9a\u4e49\u53d8\u91cf，\u7528\u4e8e\u63a5\u53d7\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53
\n struct sockaddr_in cin; \/\/ \u7528\u4e8e\u63a5\u6536\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u7684
\n socklen_t socklen = sizeof(cin); \/\/ \u7528\u4e8e\u63a5\u6536\u5730\u5740\u4fe1\u606f\u7684\u957f\u5ea6
\n \/\/ \u5b9a\u4e49\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408
\n fd_set readfds, tempfds; \/\/ \u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408
\n \/\/ \u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u6e05\u7a7a
\n FD_ZERO(&readfds);
\n \/\/ \u5c060\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ee5\u53casfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u5230\u96c6\u5408\u4e2d
\n FD_SET(0, &readfds);
\n FD_SET(sfd, &readfds);
\n \/\/ \u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf，\u7528\u4e8e\u5b58\u50a8\u5bb9\u5668\u4e2d\u7684\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int maxfd = sfd;
\n int newfd = -1; \/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\u540e，\u521b\u5efa\u7684\u901a\u4fe1\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/\u5b9a\u4e49\u4e00\u4e2a\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u6570\u7ec4\u6765\u5b58\u50a8\u5ba2\u6237\u7aef\u5bf9\u5e94\u7684\u5730\u5740\u4fe1\u606f
\n struct sockaddr_in cin_arr[1024];
\n while (1)
\n {
\n \/\/ \u5c06reafds\u5907\u4efd\u4e00\u4efd\u653e\u5165tempfds\u4e2d
\n tempfds = readfds;
\n \/\/ \u8c03\u7528\u963b\u585e\u51fd\u6570，\u5b8c\u6210\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u7ba1\u7406\u5de5\u4f5c
\n int res = select(maxfd + 1, &tempfds, NULL, NULL, NULL);
\n if (res == -1)
\n {
\n perror("select error");
\n return -1;
\n }
\n else if (res == 0)
\n {
\n printf("time out !!!\\\\n");
\n return -1;
\n }
\n \/\/ \u7a0b\u5e8f\u6267\u884c\u81f3\u6b64，\u8868\u793a\u4e00\u5b9a\u6709\u5176\u4e2d\u81f3\u5c11\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e86\u4e8b\u4ef6，\u53ea\u9700\u8981\u5224\u65ad\u54ea\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fd8\u5728\u96c6\u5408\u4e2d
\n \/\/ \u5c31\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e86\u4e8b\u4ef6
\n \/\/ \u8868\u793asfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u89e6\u53d1\u4e86\u4e8b\u4ef6
\n if (FD_ISSET(sfd, &tempfds))
\n {
\n newfd = accept(sfd, (struct sockaddr *)&cin, &socklen);
\n \/\/ \u53c2\u65701：\u670d\u52a1\u5668\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65702：\u7528\u4e8e\u63a5\u6536\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u7684\u5bb9\u5668，\u5982\u679c\u4e0d\u63a5\u6536，\u4e5f\u53ef\u4ee5\u586bNULL
\n \/\/ \u53c2\u65703：\u63a5\u6536\u53c2\u65702\u7684\u5927\u5c0f，\u5982\u679c\u53c2\u65702\u4e3aNULL，\u5219\u53c2\u65703\u4e5f\u662fNULL
\n if (newfd == -1)
\n {
\n perror("accept error");
\n return -1;
\n }
\n printf("[%s:%d]:\u5df2\u8fde\u63a5\u6210\u529f，newfd = %d!!!!\\\\n",
\n inet_ntoa(cin.sin_addr),
\n ntohs(cin.sin_port), newfd);
\n \/\/\u5c06\u8be5\u5ba2\u6237\u7aef\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u653e\u5165\u6570\u7ec4\u5bf9\u5e94\u7684\u4f4d\u7f6e\u4e0a
\n cin_arr[newfd] = cin; \/\/newfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u672acin_arr[newfd]
\n \/\/ \u5c06\u5f53\u524d\u7684newfd\u653e\u5165\u5230\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d，\u4ee5\u4fbf\u4e8e\u68c0\u6d4b\u4f7f\u7528
\n FD_SET(newfd, &readfds); \/\/ \u52a0\u5165\u5230tempfds\u4e2d
\n \/\/ \u66f4\u65b0maxfd，\u5982\u4f55\u66f4\u65b0？
\n if (maxfd < newfd) \/\/ \u5224\u65ad\u6700\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6bd4\u5f53\u524d\u5bb9\u5668\u4e2d\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5927
\n {
\n maxfd = newfd;
\n }
\n }
\n \/\/ \u5224\u65ad0\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u4ea7\u751f\u4e86\u4e8b\u4ef6
\n if (FD_ISSET(0, &tempfds))
\n {
\n char wbuf[128] = ""; \/\/ \u5b57\u7b26\u6570\u7ec4
\n fgets(wbuf, sizeof(wbuf), stdin); \/\/ \u4ece\u7ec8\u7aef\u8bfb\u53d6\u6570\u636e,\u963b\u585e\u51fd\u6570
\n printf("\u89e6\u53d1\u4e86\u952e\u76d8\u8f93\u5165\u4e8b\u4ef6：%s\\\\n", wbuf);
\n \/\/\u80fd\u4e0d\u80fd\u5c06\u8f93\u5165\u7684\u6570\u636e，\u5168\u90e8\u53d1\u9001\u7ed9\u6240\u6709\u5ba2\u6237\u7aef
\n for(int i=4; i<=maxfd; i++)
\n {
\n send(i, wbuf, strlen(wbuf), 0); \/\/\u5c06\u6570\u636e\u53d1\u9001\u7ed9\u6240\u6709\u5ba2\u6237\u7aef
\n }
\n }
\n \/\/ \u5224\u65ad\u662f\u5426\u662fnewfd\u4ea7\u751f\u4e86\u4e8b\u4ef6
\n \/\/ \u5faa\u73af\u5c06\u6240\u6709\u5ba2\u6237\u7aef\u6587\u4ef6\u63cf\u8ff0\u7b26\u904d\u5386\u4e00\u904d，\u5982\u679c\u8fd8\u5b58\u5728\u4e8etempfds\u4e2d\u7684\u5ba2\u6237\u7aef，\u8868\u793a\u6709\u6570\u636e\u63a5\u6536\u8fc7\u6765
\n for (int i = 4; i <= maxfd; i++)
\n {
\n if (FD_ISSET(i, &tempfds))
\n {
\n \/\/ 5\u3001\u6570\u636e\u6536\u53d1
\n char rbuf[128] = ""; \/\/ \u6570\u636e\u5bb9\u5668
\n \/\/ \u6e05\u7a7a\u5bb9\u5668\u4e2d\u7684\u5185\u5bb9
\n bzero(rbuf, sizeof(rbuf));
\n \/\/ \u4ece\u5957\u63a5\u5b57\u4e2d\u8bfb\u53d6\u6d88\u606f
\n int res = recv(i, rbuf, sizeof(rbuf), 0);
\n if (res == 0)
\n {
\n printf("\u5bf9\u7aef\u5df2\u7ecf\u4e0b\u7ebf\\\\n");
\n \/\/ \u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u5173\u95ed
\n close(i);
\n \/\/\u9700\u8981\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecereadfds\u4e2d\u5220\u9664
\n FD_CLR(i, &readfds);
\n \/\/ \u66f4\u65b0maxfd
\n for(int k=maxfd; k>=0; k–)
\n {
\n if(FD_ISSET(k, &readfds))
\n {
\n maxfd = k;
\n break; \/\/\u7ed3\u675f\u5411\u4e0b\u8fdb\u884c\u7684\u5faa\u73af
\n }
\n }
\n continue; \/\/ \u672c\u6b21\u5faa\u73af\u7ed3\u675f，\u7ee7\u7eed\u4e0b\u4e00\u6b21\u7684select\u7684\u963b\u585e
\n }
\n printf("[%s:%d]:%s\\\\n",
\n inet_ntoa(cin_arr[i].sin_addr),
\n ntohs(cin_arr[i].sin_port), rbuf);
\n \/\/ \u5bf9\u6536\u5230\u7684\u6570\u636e\u5904\u7406\u4e00\u4e0b，\u56de\u7ed9\u5ba2\u6237\u7aef
\n strcat(rbuf, "*_*");
\n \/\/ \u5c06\u6d88\u606f\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef
\n if (send(i, rbuf, strlen(rbuf), 0) == -1)
\n {
\n perror("send error");
\n return -1;
\n }
\n printf("\u53d1\u9001\u6210\u529f\\\\n");
\n }
\n }
\n }
\n close(sfd);<\/p>\n
\n} <\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144457-6a637a69ce6d7.png\")
<\/p>\n
\n\u00a0📖\u00a0\u4f18\u7f3a\u70b9<\/h4>\n
\n
\u4f18\u70b9\u7f3a\u70b9<\/tr>\n \n\n 1.\u00a0\u517c\u5bb9\u6027\u5f3a：POSIX \u6807\u51c6，\u51e0\u4e4e\u6240\u6709 Unix \u7cfb\u7edf\u90fd\u652f\u6301<\/td>\n 1.\u00a0\u8fde\u63a5\u6570\u53d7\u9650：\u4f4d\u56fe\u7ed3\u6784\u786c\u7f16\u7801 1024 \u4e0a\u9650<\/td>\n<\/tr>\n \n 2.\u00a0\u7cbe\u5ea6\u9ad8：\u8d85\u65f6\u65f6\u95f4\u53ef\u7cbe\u786e\u5230\u5fae\u79d2\u7ea7<\/td>\n 2.\u00a0\u5168\u91cf\u626b\u63cf：O(n) \u904d\u5386\u6240\u6709 fd，\u65e0\u8bba\u662f\u5426\u5c31\u7eea<\/td>\n<\/tr>\n \n 3.\u00a0\u5b9e\u73b0\u7b80\u5355：\u4ee3\u7801\u76f4\u89c2，\u9002\u5408\u6559\u5b66\u6f14\u793a<\/td>\n 3.\u00a0\u91cd\u590d\u62f7\u8d1d：\u6bcf\u6b21\u8c03\u7528\u4e24\u6b21\u6570\u636e\u62f7\u8d1d，\u4e14\u7834\u574f\u539f\u96c6\u5408\u9700\u91cd\u7f6e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u00a0📖 \u6a21\u578b\u603b\u7ed3<\/h4>\n
\nbind(); \/\/\u7ed1\u5b9aip\u548c\u7aef\u53e3\u53f7
\nlisten(); \/\/\u76d1\u542c<\/p>\n
\nFD_ZERO(); \/\/\u6e05\u7a7a\u5bb9\u5668
\nFD_SET(); \/\/\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u5bb9\u5668
\nmaxfd = sfd; \/\/\u8bb0\u5f55\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n
\n{
\n tempfds = readfds; \/\/\u5907\u4efd\u4e00\u4efd\u5bb9\u5668
\n select(maxfd, &readfds, NULL, NULL, NULL); \/\/\u963b\u585e\u7b49\u5f85\u96c6\u5408\u4e2d\u662f\u5426\u6709\u4e8b\u4ef6\u4ea7\u751f<\/p>\n
\n if(FD_ISSET(sfd, &tempfds))
\n {
\n newfd = accept(); \/\/\u63a5\u6536\u5ba2\u6237\u7aef\u8bf7\u6c42
\n FD_SET(newfd, &readfds); \/\/\u5c06\u65b0\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u96c6\u5408
\n \/\/\u66f4\u65b0maxfd
\n }<\/p>\n
\n for(i=4; i<=maxfd; i++)
\n {
\n send();
\n recv();
\n close(i); \/\/\u9000\u51fa\u5ba2\u6237\u7aef
\n FD_CLR(i, &readfds);
\n \/\/\u66f4\u65b0maxfd
\n }<\/p>\n
\n\/\/\u5173\u95ed\u76d1\u542c
\nclose(sfd); <\/p>\n
\n\u4e8c\u3001IO\u591a\u8def\u590d\u7528\u4e4bpoll<\/h3>\n
\u00a0📖\u00a0poll\u51fd\u6570<\/h4>\n
\n\n
\n \u51fd\u6570\u539f\u578b<\/td>\n int poll(struct pollfd *fds, nfds_t nfds, int timeout);<\/span><\/span><\/td>\n<\/tr>\n \n \u5934\u6587\u4ef6<\/td>\n poll.h<\/td>\n<\/tr>\n \n \u529f\u80fd<\/td>\n \u963b\u585e\u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u662f\u5426\u6709\u4e8b\u4ef6\u4ea7\u751f，\u5982\u679c\u6709，\u5219\u89e3\u9664\u963b\u585e，\u8fd4\u56de\u672c\u6b21\u89e6\u53d1\u4e8b\u4ef6\u7684\u6587\u4ef6 \u63cf\u8ff0\u7b26\u4e2a\u6570<\/span><\/td>\n<\/tr>\n \n \u53c2\u6570\u8bf4\u660e<\/td>\n \n \n \u8fd4\u56de\u503c<\/td>\n \n
\n\u00a0📖\u00a0poll\u5b9e\u73b0TCP\u5ba2\u6237\u7aef<\/h4>\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <sys\/select.h>
\n#include <poll.h>
\n#define SER_PORT 8888
\n#define SER_IP "192.168.160.129"
\n#define CLI_PORT 9999
\n#define CLI_IP "192.168.160.129"
\nint main(int argc, const char *argv[]){
\n \/\/ 1\u3001\u521b\u5efa\u7528\u4e8e\u901a\u4fe1\u7684\u5ba2\u6237\u7aef\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int cfd = socket(AF_INET, SOCK_STREAM, 0);
\n if(cfd == -1){
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success cfd = %d\\\\n", cfd); \/\/ 3<\/p>\n
\n cin.sin_family = AF_INET;
\n cin.sin_port = htons(CLI_PORT);
\n cin.sin_addr.s_addr = inet_addr(CLI_IP);<\/p>\n
\n perror("bind error");
\n return -1;
\n }
\n printf("\u7ed1\u5b9a\u6210\u529f\\\\n");<\/p>\n
\n struct sockaddr_in sin;
\n sin.sin_family = AF_INET;
\n sin.sin_port = htons(SER_PORT);
\n sin.sin_addr.s_addr = inet_addr(SER_IP);<\/p>\n
\n perror("connect error");
\n return -1;
\n }
\n printf("\u8fde\u63a5\u670d\u52a1\u5668\u6210\u529f\\\\n");<\/p>\n
\n struct pollfd pfds[2];
\n pfds[0].fd = 0; \/\/ \u8868\u793a\u68c0\u6d4b0\u53f7
\n pfds[0].events = POLLIN; \/\/ \u8868\u793a\u68c0\u6d4b\u7684\u662f\u8bfb\u4e8b\u4ef6<\/p>\n
\n pfds[1].events = POLLIN; \/\/ \u68c0\u6d4b\u8bfb\u4e8b\u4ef6
\n \/\/ 4\u3001\u6570\u636e\u6536\u53d1
\n char wbuf[128] = "";
\n while(1){
\n int res = poll(pfds, 2, -1);
\n \/\/ \u529f\u80fd：\u963b\u585e\u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u662f\u5426\u6709\u4e8b\u4ef6\u4ea7\u751f
\n \/\/ \u53c2\u65701：\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u8d77\u59cb\u5730\u5740
\n \/\/ \u53c2\u65702：\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570
\n \/\/ \u53c2\u65703：\u8868\u793a\u6c38\u4e45\u7b49\u5f85
\n if(res == -1){
\n perror("poll error");
\n return -1;
\n }<\/p>\n
\n \/\/ \u8868\u793a0\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e8b\u4ef6
\n if(pfds[0].revents == POLLIN){
\n \/\/ \u6e05\u7a7a\u5bb9\u5668
\n bzero(wbuf, sizeof(wbuf));
\n fgets(wbuf, sizeof(wbuf), stdin);
\n wbuf[strlen(wbuf) – 1] = 0; \/\/ \u5c06\u6362\u884c\u6539\u6389<\/p>\n
\n perror("send error");
\n return -1;
\n }
\n }<\/p>\n
\n if(recv(cfd, wbuf, sizeof(wbuf), 0) == 0){
\n printf("\u5bf9\u7aef\u5df2\u4e0b\u7ebf\\\\n");
\n break;
\n }
\n printf("\u6536\u5230\u670d\u52a1\u5668\u6d88\u606f\u4e3a：%s\\\\n",wbuf);
\n }
\n }<\/p>\n
\n close(cfd);<\/p>\n
\n} <\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724144459-6a637a6b14b2d.png\")
<\/p>\n
\n\u00a0📖\u00a0\u4f18\u7f3a\u70b9<\/h4>\n
\n
\u4f18\u70b9\u7f3a\u70b9<\/tr>\n \n\n 1.\u00a0\u65e0\u8fde\u63a5\u4e0a\u9650：\u94fe\u8868\u7ed3\u6784\u7a81\u7834 1024，\u652f\u6301\u4e07\u7ea7 fd<\/td>\n 1.\u00a0\u4ecd\u662f O(n)：\u4fdd\u6301\u7ebf\u6027\u626b\u63cf，\u5341\u4e07\u7ea7\u8fde\u63a5\u65f6\u5403\u529b<\/td>\n<\/tr>\n \n 2.\u00a0\u63a5\u53e3\u53cb\u597d：\u4e0d\u7834\u574f\u8f93\u5165\u6570\u636e，\u65e0\u9700\u6bcf\u6b21\u91cd\u7f6e\u6570\u7ec4<\/td>\n 2.\u00a0\u62f7\u8d1d\u5f00\u9500：\u6bcf\u6b21\u5168\u91cf\u62f7\u8d1d pollfd \u6570\u7ec4，\u5185\u5b58\u538b\u529b\u5927<\/td>\n<\/tr>\n \n 3.\u00a0\u4e8b\u4ef6\u4e30\u5bcc：\u652f\u6301 POLLRDHUP \u7b49\u66f4\u591a\u4e8b\u4ef6\u7c7b\u578b<\/td>\n 3.\u00a0\u67e5\u627e\u4f4e\u6548：\u8fd4\u56de\u540e\u4ecd\u9700\u904d\u5386\u6570\u7ec4\u5b9a\u4f4d\u5c31\u7eea fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u00a0📖\u00a0\u603b\u7ed3select\u548cpoll\u7684\u533a\u522b<\/h4>\n
\n\u4e09\u3001IO\u591a\u8def\u590d\u7528\u4e4bepoll<\/h3>\n
\u00a0📖 \u6709\u5173epoll\u7684\u57fa\u7840\u6982\u5ff5<\/h4>\n
\n\u00a0📖\u00a0epoll\u76f8\u5173API\u51fd\u6570<\/h4>\n
\n\n
\n \u51fd\u6570\u539f\u578b<\/td>\n int epoll_create(int size);<\/span><\/span><\/td>\n<\/tr>\n \n \u5934\u6587\u4ef6<\/td>\n sys\/epoll.h<\/td>\n<\/tr>\n \n \u529f\u80fd<\/td>\n \u521b\u5efa\u4e00\u4e2aepoll\u5b9e\u4f8b，\u5e76\u8fd4\u56de\u8be5\u5b9e\u4f8b\u7684\u53e5\u67c4，\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/td>\n<\/tr>\n \n \u53c2\u6570\u8bf4\u660e<\/td>\n epoll\u5b9e\u4f8b\u4e2d\u80fd\u591f\u5bb9\u7eb3\u7684\u6700\u5927\u8282\u70b9\u4e2a\u6570，\u81ea\u4ecelinux 2.6.8\u7248\u672c\u540e，size\u53ef\u4ee5\u5ffd\u7565，\u4f46\u662f \u5fc5\u987b\u8981\u662f\u4e00\u4e2a\u5927\u4e8e0\u7684\u6570\u5b57<\/span><\/td>\n<\/tr>\n \n \u8fd4\u56de\u503c<\/td>\n \u8fd4\u56de\u503c：\u6210\u529f\u8fd4\u56de\u63a7\u5236epoll\u5b9e\u4f8b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5931\u8d25\u8fd4\u56de-1\u5e76\u7f6e\u4f4d\u9519\u8bef\u7801<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n\n
\n \u51fd\u6570\u539f\u578b<\/td>\n int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);<\/span><\/span><\/td>\n<\/tr>\n \n \u5934\u6587\u4ef6<\/td>\n sys\/epoll.h<\/td>\n<\/tr>\n \n \u529f\u80fd<\/td>\n \u5b8c\u6210\u5bf9epoll\u5b9e\u4f8b\u7684\u63a7\u5236<\/span><\/td>\n<\/tr>\n \n \u53c2\u6570\u8bf4\u660e<\/td>\n \n \n \u8fd4\u56de\u503c<\/td>\n \u8fd4\u56de\u503c：\u6210\u529f\u8fd4\u56de0，\u5931\u8d25\u8fd4\u56de-1\u5e76\u7f6e\u4f4d\u9519\u8bef\u7801<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n\n
\n \u51fd\u6570\u539f\u578b<\/td>\n int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);<\/span><\/span><\/td>\n<\/tr>\n \n \u5934\u6587\u4ef6<\/td>\n sys\/epoll.h<\/td>\n<\/tr>\n \n \u529f\u80fd<\/td>\n \u963b\u585e\u68c0\u6d4bepoll\u5b9e\u4f8b\u4e2d\u662f\u5426\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u51c6\u5907\u5c31\u7eea，\u5982\u679c\u51c6\u5907\u5c31\u7eea\u4e86，\u5c31\u89e3\u9664\u963b\u585e<\/span><\/td>\n<\/tr>\n \n \u53c2\u6570\u8bf4\u660e<\/td>\n \n \n \u8fd4\u56de\u503c<\/td>\n \n
\n\u00a0📖\u00a0epoll\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h4>\n
\n#include<cstdio>
\n#include<cstring>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <sys\/wait.h>
\n#include <signal.h>
\n#include <sys\/ipc.h>
\n#include <sys\/msg.h>
\n#include <sys\/shm.h>
\n#include <sys\/sem.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <sys\/select.h>
\n#include <poll.h>
\n#include <sys\/epoll.h>
\nusing namespace std;
\n#define SER_PORT 8888
\n#define SER_IP "192.168.160.129"<\/p>\n
\n int sfd = socket(AF_INET, SOCK_STREAM, 0);
\n if(sfd == -1){
\n perror("socket error");
\n return -1;
\n }
\n printf("socket success sfd = %d\\\\n", sfd);<\/p>\n
\n sin.sin_family = AF_INET;
\n sin.sin_port = htons(SER_PORT);
\n sin.sin_addr.s_addr = inet_addr(SER_IP);<\/p>\n
\n perror("bind error");
\n return -1;
\n }
\n printf("binf success \\\\n");
\n if(listen(sfd, 128) == -1){
\n perror("listen error");
\n return -1;
\n }
\n printf("listen success \\\\n");<\/p>\n
\n socklen_t socklen = sizeof(cin);<\/p>\n
\n int epfd = epoll_create(1);
\n if(epfd == -1){
\n perror("epoll_create error");
\n return -1;
\n }<\/p>\n
\n struct epoll_event ev;
\n ev.events = EPOLLIN; \/\/ \u8981\u68c0\u6d4b\u7684\u662f\u8bfb\u4e8b\u4ef6
\n ev.data.fd = sfd; \/\/ \u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fe1\u606f
\n epoll_ctl(epfd, EPOLL_CTL_ADD, sfd, &ev);
\n \/\/ \u529f\u80fd：\u5c06sfd\u653e\u5165\u5230\u68c0\u6d4b\u96c6\u5408\u4e2d
\n \/\/ \u53c2\u65701：epoll\u5b9e\u4f8b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65702：epoll\u64cd\u4f5c，\u8868\u793a\u8981\u6dfb\u52a0\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65703：\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u503c
\n \/\/ \u53c2\u65704：\u8981\u68c0\u6d4b\u7684\u4e8b\u4ef6<\/p>\n
\n struct epoll_event evs[1024];
\n int size = sizeof(evs) \/ sizeof(evs[0]);<\/p>\n
\n int num = epoll_wait(epfd, evs, size, -1);
\n \/\/ \u53c2\u65701：epoll\u5b9e\u4f8b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u53c2\u65702：\u8fd4\u56de\u89e6\u53d1\u4e8b\u4ef6\u7684\u6587\u4ef6\u4e8b\u4ef6\u96c6\u5408
\n \/\/ \u53c2\u65703：\u96c6\u5408\u7684\u5927\u5c0f
\n \/\/ \u53c2\u65704：\u662f\u5426\u963b\u585e
\n printf("num = %d\\\\n", num); \/\/ \u8f93\u51fa\u672c\u6b21\u89e6\u53d1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<\/p>\n
\n for(int i=0;i<num;i++){
\n int fd = evs[i].data.fd; \/\/ \u83b7\u53d6\u672c\u6b21\u89e3\u9664\u963b\u585e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n
\n if(fd == sfd){
\n int newfd = accept(sfd, (struct sockaddr*)&cin, &socklen);
\n if(newfd == -1){
\n perror("accept error");
\n return -1;
\n }
\n printf("[%s:%d]:\u5df2\u8fde\u63a5\u6210\u529f，newfd = %d!!!!\\\\n",
\n inet_ntoa(cin.sin_addr),
\n ntohs(cin.sin_port), newfd);<\/p>\n
\n struct epoll_event ev;
\n ev.events = EPOLLIN; \/\/ \u8981\u68c0\u6d4b\u7684\u662f\u8bfb\u4e8b\u4ef6
\n ev.data.fd = newfd; \/\/ \u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fe1\u606f
\n epoll_ctl(epfd, EPOLL_CTL_ADD, newfd, &ev);
\n }
\n else{
\n char rbuf[128] = "";
\n bzero(rbuf, sizeof(rbuf));
\n int res = recv(fd, rbuf, sizeof(rbuf), 0);
\n if(res == 0){
\n printf("\u5bf9\u7aef\u5df2\u4e0b\u7ebf！\\\\n");
\n \/\/\u5c06\u5ba2\u6237\u7aef\u4eceepoll\u6811\u4e2d\u5220\u9664
\n epoll_ctl(epfd, EPOLL_CTL_DEL, fd, NULL);
\n close(fd);
\n break;
\n }
\n printf("\u6536\u5230\u6570\u636e：%s\\\\n", rbuf);<\/p>\n
\n if(send(fd, rbuf, sizeof(rbuf), 0) == -1){
\n perror("send error");
\n return -1;
\n }
\n printf("\u53d1\u9001\u6210\u529f\\\\n");
\n }
\n }
\n }
\n close(sfd);
\n close(epfd);<\/p>\n
\n} <\/p>\n\u00a0📖 \u6a21\u578b\u603b\u7ed3<\/h4>\n
\n2\u3001bind（）； \/\/\u7ed1\u5b9aip\u5730\u5740\u548c\u7aef\u53e3\u53f7
\n3\u3001listen（）； \/\/\u5c06\u5957\u63a5\u5b57\u8bbe\u7f6e\u6210\u88ab\u52a8\u76d1\u542c\u72b6\u6001
\n4\u3001\u521b\u5efa\u4e00\u4e2aepoll\u5b9e\u4f8b，\u5e76\u5c06\u7528\u4e8e\u8fde\u63a5\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u5230epoll\u6811\u4e2d
\n struct epoll_event ev;
\n ev.events = EPOLLIN; \/\/\u68c0\u6d4b\u8bfb\u4e8b\u4ef6
\n ev.data.fd = sfd; \/\/\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n int ret = epoll_ctl(epfd, EPOLL_CTL_ADD, sfd, &ev);<\/p>\n
\n int num = epoll_wait(epfd, evs, size, -1);<\/p>\n
\n newfd = accept(); \/\/\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42
\n struct epoll_event ev;
\n ev.event = EPOLLIN;
\n ev.data.fd = newfd;
\n int ret = epoll_ctl(epfd, EPOLL_CTL_ADD, newfd, &ev);<\/p>\n
\n int len = recv();
\n if(len == 0){
\n epoll_ctl(epfd, EPOLL_CTL_DEL, newfd, NULL); \/\/\u5c06newfd\u4ece\u96c6\u5408\u4e2d\u5220\u9664
\n close(newfd);
\n }
\n else if(len > 0){
\n send();
\n } <\/p>\n\u00a0📖 epoll\u7684\u4e24\u79cd\u5de5\u4f5c\u6a21\u5f0f<\/h4>\n
\n
\n