{"id":83264,"date":"2026-07-25T19:16:35","date_gmt":"2026-07-25T11:16:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/83264.html"},"modified":"2026-07-25T19:16:35","modified_gmt":"2026-07-25T11:16:35","slug":"linux-c-%e5%a4%9a%e7%ba%bf%e7%a8%8b-tcp-%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%9a%e4%bb%8e-accept-%e5%88%b0%e5%b7%a5%e4%bd%9c%e7%ba%bf%e7%a8%8b%e7%9a%84%e5%ae%8c%e6%95%b4%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/83264.html","title":{"rendered":"Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668\uff1a\u4ece `accept()` \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u4ece &#096;accept()&#096; \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u5148\u533a\u5206\u56db\u4e2a\u91cd\u8981\u6982\u5ff5<\/li>\n<li>\n<ul>\n<li>2.1 \u4e3b\u7ebf\u7a0b<\/li>\n<li>2.2 \u5de5\u4f5c\u7ebf\u7a0b<\/li>\n<li>2.3 \u76d1\u542c\u5957\u63a5\u5b57 &#096;listenfd&#096;<\/li>\n<li>2.4 \u901a\u4fe1\u5957\u63a5\u5b57 &#096;connfd&#096;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u7684\u5b8c\u6574\u8fd0\u884c\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>\u7b2c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5<\/li>\n<li>\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u4ec0\u4e48&#xff0c;\u72ec\u5360\u4ec0\u4e48<\/li>\n<li>\n<ul>\n<li>4.1 \u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u62e5\u6709\u7684\u8d44\u6e90<\/li>\n<li>4.2 \u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u8d44\u6e90<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u5171\u4eab\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d<\/li>\n<li>\n<ul>\n<li>\u591a\u8fdb\u7a0b\u548c\u591a\u7ebf\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u533a\u522b<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u80fd\u4e0d\u80fd\u91cd\u590d\u4f7f\u7528\u4e3b\u7ebf\u7a0b\u4e2d\u7684 &#096;connfd&#096; \u53d8\u91cf<\/li>\n<li>\n<ul>\n<li>6.1 \u9519\u8bef\u5199\u6cd5&#xff1a;\u4f20\u9012\u540c\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740<\/li>\n<li>6.2 \u6b63\u786e\u5199\u6cd5&#xff1a;\u6bcf\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u72ec\u7acb\u53c2\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001\u539f\u59cb\u793a\u4f8b\u4ee3\u7801\u4e2d\u5b58\u5728\u7684\u95ee\u9898<\/li>\n<li>\n<ul>\n<li>7.1 &#096;read()&#096; \u540e\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528 &#096;strlen()&#096;<\/li>\n<li>7.2 &#096;write()&#096; \u4e0d\u4fdd\u8bc1\u4e00\u6b21\u5199\u5b8c<\/li>\n<li>7.3 \u5ba2\u6237\u7aef\u65ad\u5f00\u540e\u6ca1\u6709\u8c03\u7528 &#096;close()&#096;<\/li>\n<li>7.4 \u5168\u5c40\u6570\u7ec4\u5b58\u5728\u6570\u636e\u7ade\u4e89<\/li>\n<li>7.5 &#096;pthread_t&#096; \u4e0d\u80fd\u5047\u8bbe\u53ef\u4ee5\u8bbe\u7f6e\u4e3a &#096;-1&#096;<\/li>\n<li>7.6 &#096;accept()&#096; \u7684\u5730\u5740\u957f\u5ea6\u5e94\u4f7f\u7528 &#096;socklen_t&#096;<\/li>\n<li>7.7 \u6ca1\u6709\u5904\u7406 &#096;pthread_create()&#096; \u5931\u8d25<\/li>\n<li>7.8 \u7ebf\u7a0b\u5206\u79bb\u4e0d\u7b49\u4e8e\u81ea\u52a8\u91ca\u653e\u6240\u6709\u8d44\u6e90<\/li>\n<\/ul>\n<\/li>\n<li>\u516b\u3001\u5b8c\u6574\u7684\u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<li>\u4e5d\u3001\u4ee3\u7801\u4e2d\u7684\u53c2\u6570\u6240\u6709\u6743<\/li>\n<li>\n<ul>\n<li>\u5982\u679c\u7ebf\u7a0b\u521b\u5efa\u5931\u8d25<\/li>\n<li>\u5982\u679c\u7ebf\u7a0b\u521b\u5efa\u6210\u529f<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u3001\u4e3a\u4ec0\u4e48\u4e0d\u518d\u4f7f\u7528\u5168\u5c40\u6570\u7ec4<\/li>\n<li>\u5341\u4e00\u3001&#096;recv()&#096; \u4e3a\u4ec0\u4e48\u53ef\u80fd\u4e00\u6b21\u8bfb\u4e0d\u5b8c\u6574<\/li>\n<li>\u5341\u4e8c\u3001\u4e3a\u4ec0\u4e48\u5de5\u4f5c\u7ebf\u7a0b\u963b\u585e\u4e0d\u4f1a\u5f71\u54cd\u4e3b\u7ebf\u7a0b<\/li>\n<li>\u5341\u4e09\u3001\u5206\u79bb\u7ebf\u7a0b\u7684\u4f5c\u7528<\/li>\n<li>\u5341\u56db\u3001\u7f16\u8bd1\u548c\u8fd0\u884c<\/li>\n<li>\n<ul>\n<li>\u4f7f\u7528 &#096;nc&#096; \u6d4b\u8bd5<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u4e94\u3001\u5fc5\u987b\u8bb0\u4f4f\u7684\u6838\u5fc3\u7ed3\u8bba<\/li>\n<li>\n<ul>\n<li>1. &#096;listenfd&#096; \u548c &#096;connfd&#096; \u4e0d\u662f\u540c\u4e00\u4e2a\u5957\u63a5\u5b57<\/li>\n<li>2. \u6bcf\u6b21 &#096;accept()&#096; \u90fd\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u901a\u4fe1\u5957\u63a5\u5b57<\/li>\n<li>3. \u4e3b\u7ebf\u7a0b\u53ea\u8d1f\u8d23\u63a5\u6536\u8fde\u63a5<\/li>\n<li>4. \u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u8d1f\u8d23\u4e00\u4e2a\u5ba2\u6237\u7aef<\/li>\n<li>5. \u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u4e3b\u7ebf\u7a0b\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf<\/li>\n<li>6. \u4e0d\u80fd\u628a\u540c\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u5730\u5740\u4f20\u7ed9\u591a\u4e2a\u7ebf\u7a0b<\/li>\n<li>7. &#096;recv()&#096; \u8fd4\u56de\u591a\u5c11\u5b57\u8282&#xff0c;\u5c31\u5904\u7406\u591a\u5c11\u5b57\u8282<\/li>\n<li>8. \u5de5\u4f5c\u7ebf\u7a0b\u5fc5\u987b\u5173\u95ed\u901a\u4fe1\u5957\u63a5\u5b57<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u516d\u3001\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u6a21\u578b\u7684\u5c40\u9650<\/li>\n<li>\u603b\u7ed3<\/li>\n<\/ul>\n<h2>Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u4ece accept() \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790<\/h2>\n<h3>\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668<\/h3>\n<p>\u666e\u901a\u7684\u5355\u7ebf\u7a0b TCP \u670d\u52a1\u5668\u901a\u5e38\u6309\u7167\u4e0b\u9762\u7684\u987a\u5e8f\u8fd0\u884c&#xff1a;<\/p>\n<p>\u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57<br \/>\n    \u2193<br \/>\n\u7ed1\u5b9a IP \u548c\u7aef\u53e3<br \/>\n    \u2193<br \/>\n\u76d1\u542c\u8fde\u63a5<br \/>\n    \u2193<br \/>\naccept() \u63a5\u6536\u5ba2\u6237\u7aef<br \/>\n    \u2193<br \/>\nread()\/write() \u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1<br \/>\n    \u2193<br \/>\n\u5173\u95ed\u8fde\u63a5<br \/>\n    \u2193<br \/>\n\u7ee7\u7eed\u63a5\u6536\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef<\/p>\n<p>\u8fd9\u79cd\u5199\u6cd5\u5b58\u5728\u4e00\u4e2a\u660e\u663e\u95ee\u9898&#xff1a;<\/p>\n<p>\u5f53\u670d\u52a1\u5668\u6b63\u5728\u4e0e\u67d0\u4e2a\u5ba2\u6237\u7aef\u901a\u4fe1\u65f6&#xff0c;\u65e0\u6cd5\u53ca\u65f6\u5904\u7406\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u548c\u6570\u636e\u3002<\/p>\n<p>\u4f8b\u5982&#xff0c;\u670d\u52a1\u5668\u5df2\u7ecf\u63a5\u53d7\u4e86\u5ba2\u6237\u7aef A \u7684\u8fde\u63a5&#xff0c;\u7136\u540e\u963b\u585e\u5728&#xff1a;<\/p>\n<p><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5982\u679c\u5ba2\u6237\u7aef A \u4e00\u76f4\u4e0d\u53d1\u9001\u6570\u636e&#xff0c;\u670d\u52a1\u5668\u5c31\u4f1a\u4e00\u76f4\u7b49\u5f85\u5ba2\u6237\u7aef A\u3002\u6b64\u65f6\u5ba2\u6237\u7aef B \u5373\u4f7f\u53d1\u8d77\u8fde\u63a5&#xff0c;\u4e5f\u65e0\u6cd5\u5f97\u5230\u53ca\u65f6\u5904\u7406\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u53ef\u4ee5\u5c06\u76d1\u542c\u548c\u901a\u4fe1\u62c6\u5206\u5230\u4e0d\u540c\u7ebf\u7a0b&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    \u8d1f\u8d23 accept()&#xff0c;\u4e0d\u65ad\u63a5\u6536\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5<\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b&#xff1a;<br \/>\n    \u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u8d1f\u8d23\u4e00\u4e2a\u5ba2\u6237\u7aef<br \/>\n    \u8d1f\u8d23 recv()\/send() \u6216 read()\/write()<\/p>\n<p>\u8fd9\u5c31\u662f\u6700\u57fa\u7840\u7684&#xff1a;<\/p>\n<p>\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u5bf9\u5e94\u4e00\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u3002<\/p>\n<hr \/>\n<h2>\u4e8c\u3001\u5148\u533a\u5206\u56db\u4e2a\u91cd\u8981\u6982\u5ff5<\/h2>\n<p>\u7406\u89e3\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668\u4e4b\u524d&#xff0c;\u5fc5\u987b\u5148\u533a\u5206\u4e0b\u9762\u56db\u4e2a\u5bf9\u8c61&#xff1a;<\/p>\n<li>\u4e3b\u7ebf\u7a0b&#xff1b;<\/li>\n<li>\u5de5\u4f5c\u7ebf\u7a0b&#xff1b;<\/li>\n<li>\u76d1\u542c\u5957\u63a5\u5b57&#xff1b;<\/li>\n<li>\u901a\u4fe1\u5957\u63a5\u5b57\u3002<\/li>\n<p>\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u5982\u4e0b&#xff1a;<\/p>\n<p>\u670d\u52a1\u5668\u8fdb\u7a0b<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u4e3b\u7ebf\u7a0b<br \/>\n\u2502     \u2514\u2500\u2500 \u4f7f\u7528 listenfd \u8c03\u7528 accept()<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u5de5\u4f5c\u7ebf\u7a0b 1<br \/>\n\u2502     \u2514\u2500\u2500 \u4f7f\u7528 connfd1 \u4e0e\u5ba2\u6237\u7aef 1 \u901a\u4fe1<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u5de5\u4f5c\u7ebf\u7a0b 2<br \/>\n\u2502     \u2514\u2500\u2500 \u4f7f\u7528 connfd2 \u4e0e\u5ba2\u6237\u7aef 2 \u901a\u4fe1<br \/>\n\u2502<br \/>\n\u2514\u2500\u2500 \u5de5\u4f5c\u7ebf\u7a0b 3<br \/>\n      \u2514\u2500\u2500 \u4f7f\u7528 connfd3 \u4e0e\u5ba2\u6237\u7aef 3 \u901a\u4fe1<\/p>\n<h3>2.1 \u4e3b\u7ebf\u7a0b<\/h3>\n<p>\u4e3b\u7ebf\u7a0b\u4e3b\u8981\u8d1f\u8d23&#xff1a;<\/p>\n<ul>\n<li>\u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57&#xff1b;<\/li>\n<li>\u7ed1\u5b9a\u670d\u52a1\u5668 IP \u548c\u7aef\u53e3&#xff1b;<\/li>\n<li>\u8c03\u7528 listen() \u8fdb\u5165\u76d1\u542c\u72b6\u6001&#xff1b;<\/li>\n<li>\u5faa\u73af\u8c03\u7528 accept()&#xff1b;<\/li>\n<li>\u6bcf\u63a5\u53d7\u4e00\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u5c31\u521b\u5efa\u4e00\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u3002<\/li>\n<\/ul>\n<p>\u4e3b\u7ebf\u7a0b\u901a\u5e38\u4e0d\u76f4\u63a5\u4e0e\u5ba2\u6237\u7aef\u4ea4\u6362\u4e1a\u52a1\u6570\u636e\u3002<\/p>\n<hr \/>\n<h3>2.2 \u5de5\u4f5c\u7ebf\u7a0b<\/h3>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u4e3b\u8981\u8d1f\u8d23&#xff1a;<\/p>\n<ul>\n<li>\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e&#xff1b;<\/li>\n<li>\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42&#xff1b;<\/li>\n<li>\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u54cd\u5e94&#xff1b;<\/li>\n<li>\u68c0\u6d4b\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5&#xff1b;<\/li>\n<li>\u5173\u95ed\u901a\u4fe1\u5957\u63a5\u5b57&#xff1b;<\/li>\n<li>\u9000\u51fa\u7ebf\u7a0b\u3002<\/li>\n<\/ul>\n<p>\u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u4e00\u822c\u53ea\u8d1f\u8d23\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<hr \/>\n<h3>2.3 \u76d1\u542c\u5957\u63a5\u5b57 listenfd<\/h3>\n<p>\u670d\u52a1\u5668\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> listenfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u521b\u5efa\u4e00\u4e2a\u5957\u63a5\u5b57&#xff0c;\u7136\u540e\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a\u5957\u63a5\u5b57\u5c31\u6210\u4e3a\u76d1\u542c\u5957\u63a5\u5b57\u3002<\/p>\n<p>\u76d1\u542c\u5957\u63a5\u5b57\u7684\u4e3b\u8981\u4f5c\u7528\u662f&#xff1a;<\/p>\n<p>\u63a5\u6536\u65b0\u7684 TCP \u8fde\u63a5\u8bf7\u6c42\u3002<\/p>\n<p>\u5b83\u901a\u5e38\u4e0d\u4f1a\u88ab\u7528\u6765\u8c03\u7528 recv() \u548c send() \u4f20\u8f93\u4e1a\u52a1\u6570\u636e\u3002<\/p>\n<p>\u76d1\u542c\u5957\u63a5\u5b57\u5185\u90e8\u5173\u8054\u7684\u662f\u8fde\u63a5\u8bf7\u6c42\u961f\u5217&#xff0c;\u800c\u4e0d\u662f\u67d0\u4e2a\u5177\u4f53\u5ba2\u6237\u7aef\u7684\u6570\u636e\u901a\u4fe1\u901a\u9053\u3002<\/p>\n<hr \/>\n<h3>2.4 \u901a\u4fe1\u5957\u63a5\u5b57 connfd<\/h3>\n<p>\u5f53\u5ba2\u6237\u7aef\u5b8c\u6210 TCP \u4e09\u6b21\u63e1\u624b\u540e&#xff0c;\u670d\u52a1\u5668\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>accept() \u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>\u8fd9\u4e2a\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f\u901a\u4fe1\u5957\u63a5\u5b57&#xff0c;\u4e13\u95e8\u4ee3\u8868\u670d\u52a1\u5668\u4e0e\u67d0\u4e2a\u5ba2\u6237\u7aef\u4e4b\u95f4\u5df2\u7ecf\u5efa\u7acb\u7684 TCP \u8fde\u63a5\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>listenfd &#061; 3<\/p>\n<p>\u5ba2\u6237\u7aef A \u8fde\u63a5\u540e&#xff1a;<\/p>\n<p>connfd1 &#061; 4<\/p>\n<p>\u5ba2\u6237\u7aef B \u8fde\u63a5\u540e&#xff1a;<\/p>\n<p>connfd2 &#061; 5<\/p>\n<p>\u5ba2\u6237\u7aef C \u8fde\u63a5\u540e&#xff1a;<\/p>\n<p>connfd3 &#061; 6<\/p>\n<p>\u670d\u52a1\u5668\u8fdb\u7a0b\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u53ef\u80fd\u662f&#xff1a;<\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26 3 \u2500\u2500&gt; \u76d1\u542c\u5957\u63a5\u5b57<br \/>\n\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u2500\u2500&gt; \u5ba2\u6237\u7aef A \u7684 TCP \u8fde\u63a5<br \/>\n\u6587\u4ef6\u63cf\u8ff0\u7b26 5 \u2500\u2500&gt; \u5ba2\u6237\u7aef B \u7684 TCP \u8fde\u63a5<br \/>\n\u6587\u4ef6\u63cf\u8ff0\u7b26 6 \u2500\u2500&gt; \u5ba2\u6237\u7aef C \u7684 TCP \u8fde\u63a5<\/p>\n<p>\u56e0\u6b64&#xff1a;<\/p>\n<p><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5e76\u4e0d\u662f\u628a\u76d1\u542c\u5957\u63a5\u5b57\u8f6c\u6362\u6210\u901a\u4fe1\u5957\u63a5\u5b57&#xff0c;\u800c\u662f&#xff1a;<\/p>\n<p>\u4fdd\u7559\u539f\u6765\u7684\u76d1\u542c\u5957\u63a5\u5b57&#xff0c;\u540c\u65f6\u521b\u5efa\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u901a\u4fe1\u5957\u63a5\u5b57\u3002<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u7ee7\u7eed\u4f7f\u7528 listenfd \u63a5\u6536\u5176\u4ed6\u5ba2\u6237\u7aef&#xff0c;\u800c\u5de5\u4f5c\u7ebf\u7a0b\u4f7f\u7528 connfd \u4e0e\u5bf9\u5e94\u5ba2\u6237\u7aef\u901a\u4fe1\u3002<\/p>\n<hr \/>\n<h2>\u4e09\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u7684\u5b8c\u6574\u8fd0\u884c\u6d41\u7a0b<\/h2>\n<p>\u5047\u8bbe\u670d\u52a1\u5668\u5df2\u7ecf\u5b8c\u6210&#xff1a;<\/p>\n<p><span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u63a5\u4e0b\u6765\u4e3b\u7ebf\u7a0b\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u7b2c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5<\/h3>\n<p>\u5ba2\u6237\u7aef A \u8fde\u63a5\u670d\u52a1\u5668&#xff1a;<\/p>\n<p>connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5047\u8bbe\u8fd4\u56de&#xff1a;<\/p>\n<p>connfd &#061; 4<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u521b\u5efa\u7ebf\u7a0b A&#xff0c;\u5e76\u628a\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u4ea4\u7ed9\u7ebf\u7a0b A&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    \u7ee7\u7eed\u8c03\u7528 accept()<\/p>\n<p>\u7ebf\u7a0b A&#xff1a;<br \/>\n    \u4f7f\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u4e0e\u5ba2\u6237\u7aef A \u901a\u4fe1<\/p>\n<hr \/>\n<h3>\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5<\/h3>\n<p>\u4e3b\u7ebf\u7a0b\u518d\u6b21\u8c03\u7528&#xff1a;<\/p>\n<p>connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5ba2\u6237\u7aef B \u8fde\u63a5\u540e&#xff0c;\u5047\u8bbe\u8fd4\u56de&#xff1a;<\/p>\n<p>connfd &#061; 5<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u521b\u5efa\u7ebf\u7a0b B&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    \u7ee7\u7eed\u8c03\u7528 accept()<\/p>\n<p>\u7ebf\u7a0b A&#xff1a;<br \/>\n    \u4f7f\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u4e0e\u5ba2\u6237\u7aef A \u901a\u4fe1<\/p>\n<p>\u7ebf\u7a0b B&#xff1a;<br \/>\n    \u4f7f\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26 5 \u4e0e\u5ba2\u6237\u7aef B \u901a\u4fe1<\/p>\n<p>\u56e0\u6b64&#xff0c;\u5373\u4f7f\u7ebf\u7a0b A \u963b\u585e\u5728&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7ebf\u7a0b B \u4ecd\u7136\u53ef\u4ee5\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e3b\u7ebf\u7a0b\u4e5f\u4ecd\u7136\u53ef\u4ee5\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e09\u4e2a\u7ebf\u7a0b\u7684\u963b\u585e\u4e92\u4e0d\u5f71\u54cd\u3002<\/p>\n<hr \/>\n<h2>\u56db\u3001\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u4ec0\u4e48&#xff0c;\u72ec\u5360\u4ec0\u4e48<\/h2>\n<p>\u540c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u7684\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4&#xff0c;\u4f46\u6bcf\u4e2a\u7ebf\u7a0b\u4e5f\u6709\u81ea\u5df1\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<h3>4.1 \u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u62e5\u6709\u7684\u8d44\u6e90<\/h3>\n<p>\u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u62e5\u6709&#xff1a;<\/p>\n<ul>\n<li>\u7ebf\u7a0b\u6808&#xff1b;<\/li>\n<li>CPU \u5bc4\u5b58\u5668\u4e0a\u4e0b\u6587&#xff1b;<\/li>\n<li>\u7a0b\u5e8f\u8ba1\u6570\u5668&#xff1b;<\/li>\n<li>\u7ebf\u7a0b ID&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u5c40\u90e8\u5b58\u50a8&#xff1b;<\/li>\n<li>\u8c03\u5ea6\u72b6\u6001\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">worker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>arg<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u7684 buf \u548c count \u662f\u5c40\u90e8\u53d8\u91cf&#xff0c;\u5b58\u653e\u5728\u7ebf\u7a0b\u81ea\u5df1\u7684\u6808\u4e0a\u3002<\/p>\n<p>\u5982\u679c\u540c\u65f6\u8fd0\u884c\u5341\u4e2a\u5de5\u4f5c\u7ebf\u7a0b&#xff0c;\u90a3\u4e48\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u72ec\u7acb\u7684&#xff1a;<\/p>\n<p>buf<br \/>\ncount<\/p>\n<p>\u7ebf\u7a0b\u4e4b\u95f4\u4e0d\u4f1a\u56e0\u4e3a\u53d8\u91cf\u540d\u79f0\u76f8\u540c\u5c31\u4e92\u76f8\u8986\u76d6\u3002<\/p>\n<hr \/>\n<h3>4.2 \u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u8d44\u6e90<\/h3>\n<p>\u540c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u7684\u7ebf\u7a0b\u5171\u4eab&#xff1a;<\/p>\n<ul>\n<li>\u5168\u5c40\u53d8\u91cf&#xff1b;<\/li>\n<li>\u9759\u6001\u53d8\u91cf&#xff1b;<\/li>\n<li>\u5806\u5185\u5b58&#xff1b;<\/li>\n<li>\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4&#xff1b;<\/li>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff1b;<\/li>\n<li>\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55&#xff1b;<\/li>\n<li>\u4fe1\u53f7\u5904\u7406\u914d\u7f6e&#xff1b;<\/li>\n<li>\u8fdb\u7a0b\u7ea7\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> global_count<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539 global_count&#xff0c;\u5c31\u53ef\u80fd\u4ea7\u751f\u6570\u636e\u7ade\u4e89&#xff0c;\u9700\u8981\u4f7f\u7528\u4e92\u65a5\u9501\u3001\u539f\u5b50\u53d8\u91cf\u7b49\u540c\u6b65\u673a\u5236\u3002<\/p>\n<hr \/>\n<h2>\u4e94\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u5171\u4eab\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d<\/h2>\n<p>\u201c\u7ebf\u7a0b\u5171\u4eab\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d\u8fd9\u4e2a\u8bf4\u6cd5\u5bb9\u6613\u8ba9\u4eba\u8bef\u89e3\u3002<\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26\u672c\u8d28\u4e0a\u53ea\u662f\u4e00\u4e2a\u5c0f\u6574\u6570&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6574\u6570 4 \u672c\u8eab\u53ea\u662f\u8fdb\u7a0b\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d\u7684\u7d22\u5f15\u3002<\/p>\n<p>4 \u2500\u2500&gt; \u67d0\u4e2a\u5df2\u7ecf\u5efa\u7acb\u7684 TCP socket<\/p>\n<p>\u7531\u4e8e\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u8fdb\u7a0b\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff0c;\u6240\u4ee5\u4efb\u610f\u7ebf\u7a0b\u53ea\u8981\u77e5\u9053\u6570\u5b57 4&#xff0c;\u90fd\u53ef\u4ee5\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f46\u662f\u5728\u8bbe\u8ba1\u4e0a&#xff0c;\u5e94\u5f53\u660e\u786e\u89c4\u5b9a\u5957\u63a5\u5b57\u7684\u6240\u6709\u6743&#xff1a;<\/p>\n<p>listenfd&#xff1a;<br \/>\n    \u7531\u4e3b\u7ebf\u7a0b\u7ba1\u7406<\/p>\n<p>connfd&#xff1a;<br \/>\n    \u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b\u6210\u529f\u540e&#xff0c;\u7531\u5de5\u4f5c\u7ebf\u7a0b\u7ba1\u7406<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u628a connfd \u4ea4\u7ed9\u5de5\u4f5c\u7ebf\u7a0b\u540e&#xff0c;\u5c31\u4e0d\u5e94\u7ee7\u7eed\u64cd\u4f5c\u6216\u5173\u95ed\u5b83\u3002<\/p>\n<p>\u56e0\u4e3a\u7ebf\u7a0b\u5171\u4eab\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff0c;\u5982\u679c\u4e3b\u7ebf\u7a0b\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u7684\u540c\u4e00\u4e2a connfd \u4e5f\u4f1a\u5931\u6548\u3002<\/p>\n<p>\u8fd9\u4e0e\u591a\u8fdb\u7a0b\u670d\u52a1\u5668\u5b58\u5728\u91cd\u8981\u533a\u522b\u3002<\/p>\n<h3>\u591a\u8fdb\u7a0b\u548c\u591a\u7ebf\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u533a\u522b<\/h3>\n<table>\n<tr>\u5bf9\u6bd4\u9879\u591a\u8fdb\u7a0b\u591a\u7ebf\u7a0b<\/tr>\n<tbody>\n<tr>\n<td>\u5730\u5740\u7a7a\u95f4<\/td>\n<td>\u76f8\u4e92\u72ec\u7acb<\/td>\n<td>\u5171\u4eab<\/td>\n<\/tr>\n<tr>\n<td>\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868<\/td>\n<td>fork() \u540e\u5206\u522b\u62e5\u6709\u8868\u9879<\/td>\n<td>\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u8868<\/td>\n<\/tr>\n<tr>\n<td>\u7236\u6267\u884c close(connfd)<\/td>\n<td>\u901a\u5e38\u4e0d\u5f71\u54cd\u5b50\u8fdb\u7a0b\u4e2d\u7684\u5bf9\u5e94\u63cf\u8ff0\u7b26<\/td>\n<td>\u4f1a\u5bfc\u81f4\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u7684\u63cf\u8ff0\u7b26\u5931\u6548<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u6570\u4f20\u9012<\/td>\n<td>\u901a\u8fc7 fork() \u7ee7\u627f<\/td>\n<td>\u901a\u8fc7\u7ebf\u7a0b\u53c2\u6570\u4f20\u9012<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u56e0\u6b64&#xff0c;\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u4e2d\u5fc5\u987b\u660e\u786e&#xff1a;<\/p>\n<p>\u6210\u529f\u521b\u5efa\u7ebf\u7a0b\u540e&#xff0c;\u901a\u4fe1\u5957\u63a5\u5b57\u7531\u5de5\u4f5c\u7ebf\u7a0b\u8d1f\u8d23\u5173\u95ed\u3002<\/p>\n<hr \/>\n<h2>\u516d\u3001\u80fd\u4e0d\u80fd\u91cd\u590d\u4f7f\u7528\u4e3b\u7ebf\u7a0b\u4e2d\u7684 connfd \u53d8\u91cf<\/h2>\n<p>\u53ef\u4ee5\u3002<\/p>\n<p>\u4e0b\u9762\u8fd9\u79cd\u5199\u6cd5\u672c\u8eab\u6ca1\u6709\u95ee\u9898&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5c06 connfd \u7684\u503c\u590d\u5236\u5230\u72ec\u7acb\u5185\u5b58\u4e2d<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e3b\u7ebf\u7a0b\u6bcf\u6b21\u5faa\u73af\u90fd\u53ef\u4ee5\u91cd\u65b0\u4f7f\u7528 connfd \u53d8\u91cf\u3002<\/p>\n<p>\u771f\u6b63\u7684\u95ee\u9898\u4e0d\u662f\u201c\u53d8\u91cf\u88ab\u8986\u76d6\u201d&#xff0c;\u800c\u662f&#xff1a;<\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u62ff\u5230\u7684\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c\u7684\u72ec\u7acb\u526f\u672c&#xff0c;\u8fd8\u662f\u540c\u4e00\u4e2a\u53d8\u91cf\u7684\u5730\u5740\u3002<\/p>\n<hr \/>\n<h3>6.1 \u9519\u8bef\u5199\u6cd5&#xff1a;\u4f20\u9012\u540c\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740<\/h3>\n<p><span class=\"token keyword\">int<\/span> connfd<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u79cd\u5199\u6cd5\u5b58\u5728\u7ade\u4e89\u3002<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u4f20\u9012\u7ed9\u6240\u6709\u5de5\u4f5c\u7ebf\u7a0b\u7684\u90fd\u662f&#xff1a;<\/p>\n<p><span class=\"token operator\">&amp;<\/span>connfd<\/p>\n<p>\u4e5f\u5c31\u662f\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740\u3002<\/p>\n<p>\u53ef\u80fd\u53d1\u751f\u4e0b\u9762\u7684\u60c5\u51b5&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    connfd &#061; 4<br \/>\n    \u521b\u5efa\u7ebf\u7a0b A&#xff0c;\u4f20\u9012 &amp;connfd<\/p>\n<p>\u7ebf\u7a0b A&#xff1a;<br \/>\n    \u8fd8\u6ca1\u6709\u5f97\u5230 CPU \u6267\u884c<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    \u518d\u6b21\u8c03\u7528 accept()<br \/>\n    connfd &#061; 5<br \/>\n    \u521b\u5efa\u7ebf\u7a0b B&#xff0c;\u4ecd\u7136\u4f20\u9012 &amp;connfd<\/p>\n<p>\u7ebf\u7a0b A&#xff1a;<br \/>\n    \u5f00\u59cb\u8bfb\u53d6 *arg<br \/>\n    \u5f97\u5230\u7684\u53ef\u80fd\u5df2\u7ecf\u662f 5<\/p>\n<p>\u4e8e\u662f\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u90fd\u53ef\u80fd\u64cd\u4f5c\u6587\u4ef6\u63cf\u8ff0\u7b26 5&#xff0c;\u800c\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u88ab\u4e22\u5931\u3002<\/p>\n<p>\u95ee\u9898\u7684\u6839\u6e90\u4e0d\u662f\u5c40\u90e8\u53d8\u91cf\u540d\u79f0\u91cd\u590d&#xff0c;\u800c\u662f&#xff1a;<\/p>\n<p>\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u5757\u53c2\u6570\u5185\u5b58\u3002<\/p>\n<hr \/>\n<h3>6.2 \u6b63\u786e\u5199\u6cd5&#xff1a;\u6bcf\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u72ec\u7acb\u53c2\u6570<\/h3>\n<p>\u53ef\u4ee5\u4e3a\u6bcf\u4e2a\u5ba2\u6237\u7aef\u52a8\u6001\u5206\u914d\u4e00\u4e2a\u7ed3\u6784\u4f53&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span>client <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>client<span class=\"token operator\">-&gt;<\/span>connfd <span class=\"token operator\">&#061;<\/span> connfd<span class=\"token punctuation\">;<\/span><br \/>\nclient<span class=\"token operator\">-&gt;<\/span>addr <span class=\"token operator\">&#061;<\/span> client_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker<span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6bcf\u6b21 malloc() \u90fd\u8fd4\u56de\u72ec\u7acb\u5185\u5b58&#xff1a;<\/p>\n<p>\u7ebf\u7a0b A \u2500\u2500&gt; ClientInfo A \u2500\u2500&gt; connfd &#061; 4<br \/>\n\u7ebf\u7a0b B \u2500\u2500&gt; ClientInfo B \u2500\u2500&gt; connfd &#061; 5<br \/>\n\u7ebf\u7a0b C \u2500\u2500&gt; ClientInfo C \u2500\u2500&gt; connfd &#061; 6<\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u8bfb\u53d6\u5b8c\u53c2\u6570\u540e&#xff0c;\u518d\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u6837\u5c31\u4e0d\u9700\u8981\u4f7f\u7528\u5168\u5c40\u6570\u7ec4&#xff0c;\u4e5f\u4e0d\u9700\u8981\u5728\u7ebf\u7a0b\u4e4b\u95f4\u540c\u6b65\u6570\u7ec4\u69fd\u4f4d\u3002<\/p>\n<hr \/>\n<h2>\u4e03\u3001\u539f\u59cb\u793a\u4f8b\u4ee3\u7801\u4e2d\u5b58\u5728\u7684\u95ee\u9898<\/h2>\n<p>\u539f\u59cb\u4ee3\u7801\u7684\u603b\u4f53\u601d\u8def\u662f\u6b63\u786e\u7684&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u7ebf\u7a0b\u8c03\u7528 accept()&#xff1b;<\/li>\n<li>\u4f7f\u7528\u6570\u7ec4\u4e3a\u6bcf\u4e2a\u5ba2\u6237\u7aef\u4fdd\u5b58\u53c2\u6570&#xff1b;<\/li>\n<li>\u521b\u5efa\u5206\u79bb\u7ebf\u7a0b\u5904\u7406\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ul>\n<p>\u4f46\u662f\u4ee3\u7801\u4e2d\u5b58\u5728\u591a\u4e2a\u9700\u8981\u4fee\u6b63\u7684\u95ee\u9898\u3002<\/p>\n<hr \/>\n<h3>7.1 read() \u540e\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528 strlen()<\/h3>\n<p>\u539f\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4e25\u91cd\u9519\u8bef\u3002<\/p>\n<p>read() \u8bfb\u53d6\u7684\u662f\u539f\u59cb\u5b57\u8282&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u5728\u6570\u636e\u672b\u5c3e\u6dfb\u52a0&#xff1a;<\/p>\n<p><span class=\"token char\">&#039;\\\\0&#039;<\/span><\/p>\n<p>\u5047\u8bbe\u5ba2\u6237\u7aef\u53d1\u9001&#xff1a;<\/p>\n<p>hello<\/p>\n<p>read() \u8fd4\u56de&#xff1a;<\/p>\n<p>ret &#061; 5<\/p>\n<p>\u7f13\u51b2\u533a\u4e2d\u53ea\u6709&#xff1a;<\/p>\n<p>&#039;h&#039; &#039;e&#039; &#039;l&#039; &#039;l&#039; &#039;o&#039;<\/p>\n<p>\u540e\u9762\u4e0d\u4e00\u5b9a\u5b58\u5728\u5b57\u7b26\u4e32\u7ed3\u675f\u7b26\u3002<\/p>\n<p>\u6b64\u65f6\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f1a\u7ee7\u7eed\u5411\u540e\u8bbf\u95ee\u5185\u5b58&#xff0c;\u76f4\u5230\u5076\u7136\u9047\u5230 &#039;\\\\0&#039;&#xff0c;\u53ef\u80fd\u5bfc\u81f4&#xff1a;<\/p>\n<ul>\n<li>\u53d1\u9001\u591a\u4f59\u6570\u636e&#xff1b;<\/li>\n<li>\u8d8a\u754c\u8bfb\u53d6&#xff1b;<\/li>\n<li>\u672a\u5b9a\u4e49\u884c\u4e3a&#xff1b;<\/li>\n<li>\u7a0b\u5e8f\u5d29\u6e83\u3002<\/li>\n<\/ul>\n<p>\u6b63\u786e\u505a\u6cd5\u662f&#xff1a;<\/p>\n<p><span class=\"token class-name\">ssize_t<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>read() \u8fd4\u56de\u591a\u5c11\u5b57\u8282&#xff0c;\u5c31\u5904\u7406\u591a\u5c11\u5b57\u8282\u3002<\/p>\n<hr \/>\n<h3>7.2 write() \u4e0d\u4fdd\u8bc1\u4e00\u6b21\u5199\u5b8c<\/h3>\n<p>\u539f\u4ee3\u7801\u5047\u8bbe&#xff1a;<\/p>\n<p><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e00\u5b9a\u4f1a\u53d1\u9001 ret \u4e2a\u5b57\u8282\u3002<\/p>\n<p>\u4f46 write() \u6216 send() \u53ef\u80fd\u53ea\u53d1\u9001\u4e00\u90e8\u5206\u6570\u636e\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>\u5e0c\u671b\u53d1\u9001&#xff1a;4096 \u5b57\u8282<br \/>\n\u5b9e\u9645\u53d1\u9001&#xff1a;1500 \u5b57\u8282<\/p>\n<p>\u56e0\u6b64\u5fc5\u987b\u5faa\u73af\u53d1\u9001&#xff0c;\u76f4\u5230\u5168\u90e8\u6570\u636e\u5199\u5b8c\u3002<\/p>\n<hr \/>\n<h3>7.3 \u5ba2\u6237\u7aef\u65ad\u5f00\u540e\u6ca1\u6709\u8c03\u7528 close()<\/h3>\n<p>\u539f\u4ee3\u7801\u53ea\u662f\u6267\u884c&#xff1a;<\/p>\n<p>info<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f46\u662f\u6ca1\u6709&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u628a\u53d8\u91cf\u8bbe\u7f6e\u4e3a -1 \u5e76\u4e0d\u4f1a\u5173\u95ed\u5185\u6838\u4e2d\u7684 TCP \u5957\u63a5\u5b57\u3002<\/p>\n<p>\u8fd9\u4f1a\u9020\u6210\u6587\u4ef6\u63cf\u8ff0\u7b26\u6cc4\u6f0f\u3002<\/p>\n<p>\u670d\u52a1\u5668\u8fd0\u884c\u65f6\u95f4\u8f83\u957f\u540e&#xff0c;\u53ef\u80fd\u51fa\u73b0&#xff1a;<\/p>\n<p>Too many open files<\/p>\n<p>\u6b63\u786e\u987a\u5e8f\u5e94\u5f53\u662f&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7136\u540e\u518d\u7ed3\u675f\u7ebf\u7a0b\u3002<\/p>\n<hr \/>\n<h3>7.4 \u5168\u5c40\u6570\u7ec4\u5b58\u5728\u6570\u636e\u7ade\u4e89<\/h3>\n<p>\u539f\u4ee3\u7801\u4e2d&#xff0c;\u4e3b\u7ebf\u7a0b\u8bfb\u53d6&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>infos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u540c\u65f6\u5199\u5165&#xff1a;<\/p>\n<p>info<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e24\u4e2a\u7ebf\u7a0b\u6ca1\u6709\u4f7f\u7528\u4e92\u65a5\u9501\u6216\u539f\u5b50\u53d8\u91cf\u8fdb\u884c\u540c\u6b65\u3002<\/p>\n<p>\u4e00\u4e2a\u7ebf\u7a0b\u8bfb&#xff0c;\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u5199\u540c\u4e00\u4e2a\u666e\u901a\u53d8\u91cf&#xff0c;\u8fd9\u5728 C \u8bed\u8a00\u5185\u5b58\u6a21\u578b\u4e2d\u5c5e\u4e8e\u6570\u636e\u7ade\u4e89&#xff0c;\u884c\u4e3a\u672a\u5b9a\u4e49\u3002<\/p>\n<p>\u5373\u4f7f\u67d0\u4e9b\u673a\u5668\u4e0a\u201c\u770b\u8d77\u6765\u53ef\u4ee5\u8fd0\u884c\u201d&#xff0c;\u4e5f\u4e0d\u80fd\u8ba4\u4e3a\u5b83\u662f\u6b63\u786e\u7684\u5e76\u53d1\u7a0b\u5e8f\u3002<\/p>\n<hr \/>\n<h3>7.5 pthread_t \u4e0d\u80fd\u5047\u8bbe\u53ef\u4ee5\u8bbe\u7f6e\u4e3a -1<\/h3>\n<p>\u539f\u4ee3\u7801&#xff1a;<\/p>\n<p>infos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>tid <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>pthread_t \u7684\u5b9e\u9645\u7c7b\u578b\u7531\u7cfb\u7edf\u5b9e\u73b0\u51b3\u5b9a\u3002<\/p>\n<p>\u5b83\u4e0d\u4e00\u5b9a\u662f\u666e\u901a\u6574\u6570&#xff0c;\u56e0\u6b64\u4e0d\u80fd\u4f9d\u8d56&#xff1a;<\/p>\n<p>tid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><\/p>\n<p>\u5224\u65ad\u7ebf\u7a0b\u662f\u5426\u6709\u6548\u3002<\/p>\n<p>\u5728\u8fd9\u6bb5\u7a0b\u5e8f\u4e2d\u4e5f\u6ca1\u6709\u5fc5\u8981\u521d\u59cb\u5316 pthread_t \u4e3a -1\u3002<\/p>\n<hr \/>\n<h3>7.6 accept() \u7684\u5730\u5740\u957f\u5ea6\u5e94\u4f7f\u7528 socklen_t<\/h3>\n<p>\u539f\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u66f4\u51c6\u786e\u7684\u5199\u6cd5\u5e94\u5f53\u662f&#xff1a;<\/p>\n<p><span class=\"token class-name\">socklen_t<\/span> addr_len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5e76\u4e14\u6bcf\u6b21\u8c03\u7528 accept() \u4e4b\u524d&#xff0c;\u90fd\u5e94\u91cd\u65b0\u8bbe\u7f6e\u957f\u5ea6&#xff1a;<\/p>\n<p><span class=\"token class-name\">socklen_t<\/span> addr_len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>client_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u56e0\u4e3a accept() \u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u8f93\u5165\u8f93\u51fa\u53c2\u6570\u3002<\/p>\n<hr \/>\n<h3>7.7 \u6ca1\u6709\u5904\u7406 pthread_create() \u5931\u8d25<\/h3>\n<p>\u5982\u679c\u7ebf\u7a0b\u521b\u5efa\u5931\u8d25&#xff0c;\u901a\u4fe1\u5957\u63a5\u5b57\u5fc5\u987b\u7531\u4e3b\u7ebf\u7a0b\u5173\u95ed&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5426\u5219\u540c\u6837\u4f1a\u4ea7\u751f\u6587\u4ef6\u63cf\u8ff0\u7b26\u548c\u5806\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5931\u8d25\u65f6\u8fd4\u56de\u9519\u8bef\u7801&#xff0c;\u4e0d\u4e00\u5b9a\u8bbe\u7f6e errno\u3002<\/p>\n<p>\u56e0\u6b64\u4e0d\u80fd\u7b80\u5355\u4f7f\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pthread_create&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u800c\u5e94\u4f7f\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;pthread_create: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>7.8 \u7ebf\u7a0b\u5206\u79bb\u4e0d\u7b49\u4e8e\u81ea\u52a8\u91ca\u653e\u6240\u6709\u8d44\u6e90<\/h3>\n<p>\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_detach<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6216\u8005\u521b\u5efa\u5206\u79bb\u7ebf\u7a0b\u540e&#xff0c;\u7ebf\u7a0b\u7ed3\u675f\u65f6\u4f1a\u81ea\u52a8\u56de\u6536\u7ebf\u7a0b\u81ea\u8eab\u7684\u7ba1\u7406\u8d44\u6e90\u3002<\/p>\n<p>\u4f46\u662f\u5b83\u4e0d\u4f1a\u81ea\u52a8&#xff1a;<\/p>\n<ul>\n<li>\u5173\u95ed\u901a\u4fe1\u5957\u63a5\u5b57&#xff1b;<\/li>\n<li>\u91ca\u653e malloc() \u5206\u914d\u7684\u5185\u5b58&#xff1b;<\/li>\n<li>\u91ca\u653e\u4e1a\u52a1\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u89e3\u9501\u4e92\u65a5\u9501\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u8d44\u6e90\u4ecd\u7136\u9700\u8981\u5de5\u4f5c\u7ebf\u7a0b\u4e3b\u52a8\u6e05\u7406\u3002<\/p>\n<hr \/>\n<h2>\u516b\u3001\u5b8c\u6574\u7684\u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n<p>\u4e0b\u9762\u7ed9\u51fa\u4e00\u4e2a\u53ef\u4ee5\u76f4\u63a5\u7f16\u8bd1\u8fd0\u884c\u7684 Linux C \u591a\u7ebf\u7a0b TCP \u56de\u663e\u670d\u52a1\u5668\u3002<\/p>\n<p>\u670d\u52a1\u5668\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u540e&#xff0c;\u4f1a\u5c06\u76f8\u540c\u7684\u6570\u636e\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;pthread.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8989<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LISTEN_BACKLOG<\/span> <span class=\"token expression\"><span class=\"token number\">128<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BUFFER_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">4096<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/*<br \/>\n * \u6bcf\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u5bf9\u5e94\u4e00\u4e2a ClientInfo\u3002<br \/>\n *<br \/>\n * \u8be5\u7ed3\u6784\u4f53\u7531\u4e3b\u7ebf\u7a0b\u5206\u914d&#xff0c;<br \/>\n * \u6240\u6709\u6743\u5728 pthread_create() \u6210\u529f\u540e\u8f6c\u79fb\u7ed9\u5de5\u4f5c\u7ebf\u7a0b\u3002<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> connfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/*<br \/>\n * \u5c06\u6307\u5b9a\u957f\u5ea6\u7684\u6570\u636e\u5168\u90e8\u53d1\u9001\u51fa\u53bb\u3002<br \/>\n *<br \/>\n * \u8fd4\u56de\u503c&#xff1a;<br \/>\n *   0  \u8868\u793a\u5168\u90e8\u53d1\u9001\u6210\u529f<br \/>\n *  -1  \u8868\u793a\u53d1\u9001\u5931\u8d25<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">send_all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>data<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> length<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>buffer <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">size_t<\/span> total_sent <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>total_sent <span class=\"token operator\">&lt;<\/span> length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ssize_t<\/span> sent <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span><br \/>\n                            buffer <span class=\"token operator\">&#043;<\/span> total_sent<span class=\"token punctuation\">,<\/span><br \/>\n                            length <span class=\"token operator\">&#8211;<\/span> total_sent<span class=\"token punctuation\">,<\/span><br \/>\n                            MSG_NOSIGNAL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sent <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            total_sent <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span><span class=\"token punctuation\">)<\/span>sent<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sent <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/*<br \/>\n             * send() \u88ab\u4fe1\u53f7\u4e2d\u65ad&#xff0c;\u6ca1\u6709\u771f\u6b63\u5931\u8d25&#xff0c;<br \/>\n             * \u91cd\u65b0\u53d1\u9001\u5373\u53ef\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sent <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/*<br \/>\n             * \u5bf9\u4e8e\u975e\u96f6\u957f\u5ea6\u7684\u963b\u585e\u5f0f TCP send()&#xff0c;<br \/>\n             * \u901a\u5e38\u4e0d\u4f1a\u8fd4\u56de 0\u3002<br \/>\n             *<br \/>\n             * \u8fd9\u91cc\u8fdb\u884c\u9632\u5fa1\u6027\u5904\u7406&#xff0c;\u907f\u514d\u6b7b\u5faa\u73af\u3002<br \/>\n             *\/<\/span><br \/>\n            errno <span class=\"token operator\">&#061;<\/span> EPIPE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/*<br \/>\n * \u5de5\u4f5c\u7ebf\u7a0b\u51fd\u6570\u3002<br \/>\n *<br \/>\n * \u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u53ea\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">worker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>arg<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span>client <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u5148\u628a\u9700\u8981\u7684\u6570\u636e\u590d\u5236\u5230\u5f53\u524d\u7ebf\u7a0b\u81ea\u5df1\u7684\u6808\u4e0a\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>connfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> client_addr <span class=\"token operator\">&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u4e3b\u7ebf\u7a0b\u4e3a\u8be5\u5ba2\u6237\u7aef\u52a8\u6001\u5206\u914d\u7684\u53c2\u6570\u5df2\u7ecf\u4f7f\u7528\u5b8c\u6bd5\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    client <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> client_ip<span class=\"token punctuation\">[<\/span>INET_ADDRSTRLEN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span><br \/>\n                  <span class=\"token operator\">&amp;<\/span>client_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">,<\/span><br \/>\n                  client_ip<span class=\"token punctuation\">,<\/span><br \/>\n                  <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>client_ip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">strcpy<\/span><span class=\"token punctuation\">(<\/span>client_ip<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;unknown&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> client_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>client_addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[\u7ebf\u7a0b %lu] \u5ba2\u6237\u7aef\u5df2\u8fde\u63a5&#xff1a;%s:%hu&#xff0c;connfd&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">pthread_self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           client_ip<span class=\"token punctuation\">,<\/span><br \/>\n           client_port<span class=\"token punctuation\">,<\/span><br \/>\n           connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFER_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ssize_t<\/span> received <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span><br \/>\n                                buffer<span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>received <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[\u7ebf\u7a0b %lu] \u4ece %s:%hu \u63a5\u6536\u5230 %zd \u5b57\u8282\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                   <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">pthread_self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                   client_ip<span class=\"token punctuation\">,<\/span><br \/>\n                   client_port<span class=\"token punctuation\">,<\/span><br \/>\n                   received<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/*<br \/>\n             * TCP \u662f\u5b57\u8282\u6d41\u534f\u8bae\u3002<br \/>\n             *<br \/>\n             * recv() \u8fd4\u56de\u591a\u5c11\u5b57\u8282&#xff0c;\u5c31\u56de\u5199\u591a\u5c11\u5b57\u8282\u3002<br \/>\n             * \u4e0d\u80fd\u4f7f\u7528 strlen(buffer)\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">send_all<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span><br \/>\n                         buffer<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span><span class=\"token punctuation\">)<\/span>received<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>received <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/*<br \/>\n             * recv() \u8fd4\u56de 0&#xff0c;\u8868\u793a\u5bf9\u7aef\u6b63\u5e38\u5173\u95ed\u4e86\u8fde\u63a5\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[\u7ebf\u7a0b %lu] \u5ba2\u6237\u7aef\u6b63\u5e38\u65ad\u5f00&#xff1a;%s:%hu\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                   <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">pthread_self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                   client_ip<span class=\"token punctuation\">,<\/span><br \/>\n                   client_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/*<br \/>\n         * received &#061;&#061; -1<br \/>\n         *\/<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/*<br \/>\n             * recv() \u88ab\u4fe1\u53f7\u4e2d\u65ad&#xff0c;\u91cd\u65b0\u63a5\u6536\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u901a\u4fe1\u5957\u63a5\u5b57\u5f52\u5f53\u524d\u5de5\u4f5c\u7ebf\u7a0b\u7ba1\u7406\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[\u7ebf\u7a0b %lu] \u5de5\u4f5c\u7ebf\u7a0b\u9000\u51fa&#xff0c;connfd&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">pthread_self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/*<br \/>\n     * 1. \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> listenfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>listenfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u5141\u8bb8\u670d\u52a1\u5668\u91cd\u542f\u540e\u5feb\u901f\u91cd\u65b0\u7ed1\u5b9a\u76f8\u540c\u7aef\u53e3\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> reuse <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span><br \/>\n                   SOL_SOCKET<span class=\"token punctuation\">,<\/span><br \/>\n                   SO_REUSEADDR<span class=\"token punctuation\">,<\/span><br \/>\n                   <span class=\"token operator\">&amp;<\/span>reuse<span class=\"token punctuation\">,<\/span><br \/>\n                   <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>reuse<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;setsockopt&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * 2. \u51c6\u5907\u670d\u52a1\u5668\u5730\u5740\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> server_addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>server_addr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>server_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    server_addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    server_addr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    server_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htonl<\/span><span class=\"token punctuation\">(<\/span>INADDR_ANY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * 3. \u7ed1\u5b9a IP \u548c\u7aef\u53e3\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span><br \/>\n             <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>server_addr<span class=\"token punctuation\">,<\/span><br \/>\n             <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>server_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * 4. \u8bbe\u7f6e\u76d1\u542c\u72b6\u6001\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> LISTEN_BACKLOG<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u521b\u5efa\u7ebf\u7a0b\u5c5e\u6027&#xff0c;\u5e76\u5c06\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u5206\u79bb\u72b6\u6001\u3002<br \/>\n     *<br \/>\n     * \u5206\u79bb\u7ebf\u7a0b\u9000\u51fa\u540e&#xff0c;\u7ebf\u7a0b\u81ea\u8eab\u8d44\u6e90\u4f1a\u81ea\u52a8\u56de\u6536&#xff0c;<br \/>\n     * \u4e3b\u7ebf\u7a0b\u4e0d\u9700\u8981 pthread_join()\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token class-name\">pthread_attr_t<\/span> thread_attr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">pthread_attr_init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token string\">&#034;pthread_attr_init: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">pthread_attr_setdetachstate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">,<\/span><br \/>\n                                      PTHREAD_CREATE_DETACHED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token string\">&#034;pthread_attr_setdetachstate: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">pthread_attr_destroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8\u6210\u529f&#xff0c;\u76d1\u542c\u7aef\u53e3&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listenfd&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * 5. \u4e3b\u7ebf\u7a0b\u5faa\u73af\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/*<br \/>\n         * \u4e3a\u5f53\u524d\u5ba2\u6237\u7aef\u52a8\u6001\u5206\u914d\u72ec\u7acb\u53c2\u6570\u3002<br \/>\n         *\/<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span>client <span class=\"token operator\">&#061;<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>client <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;malloc&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/*<br \/>\n             * \u5185\u5b58\u4e0d\u8db3\u65f6\u7a0d\u4f5c\u7b49\u5f85&#xff0c;\u9632\u6b62\u5faa\u73af\u6301\u7eed\u5360\u7528 CPU\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">socklen_t<\/span> addr_len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> connfd<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/*<br \/>\n         * accept() \u53ef\u80fd\u88ab\u4fe1\u53f7\u4e2d\u65ad\u3002<br \/>\n         *\/<\/span><br \/>\n        <span class=\"token keyword\">do<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span><br \/>\n                            <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">,<\/span><br \/>\n                            <span class=\"token operator\">&amp;<\/span>addr_len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>connfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>connfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/*<br \/>\n             * \u67d0\u4e9b\u8d44\u6e90\u8017\u5c3d\u9519\u8bef\u53ef\u80fd\u6301\u7eed\u53d1\u751f&#xff0c;<br \/>\n             * \u7a0d\u4f5c\u7b49\u5f85\u540e\u7ee7\u7eed\u63a5\u6536\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EMFILE <span class=\"token operator\">||<\/span> errno <span class=\"token operator\">&#061;&#061;<\/span> ENFILE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        client<span class=\"token operator\">-&gt;<\/span>connfd <span class=\"token operator\">&#061;<\/span> connfd<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/*<br \/>\n         * 6. \u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b\u5904\u7406\u5f53\u524d\u5ba2\u6237\u7aef\u3002<br \/>\n         *\/<\/span><br \/>\n        <span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><\/p>\n<p>        err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">,<\/span><br \/>\n                             worker<span class=\"token punctuation\">,<\/span><br \/>\n                             client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token string\">&#034;pthread_create: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/*<br \/>\n             * \u7ebf\u7a0b\u521b\u5efa\u5931\u8d25&#xff0c;\u6240\u6709\u6743\u6ca1\u6709\u8f6c\u79fb\u7ed9\u5de5\u4f5c\u7ebf\u7a0b\u3002<br \/>\n             * \u56e0\u6b64\u5fc5\u987b\u7531\u4e3b\u7ebf\u7a0b\u6e05\u7406\u8d44\u6e90\u3002<br \/>\n             *\/<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/*<br \/>\n         * pthread_create() \u6210\u529f\u540e&#xff1a;<br \/>\n         *<br \/>\n         * 1. client \u7684\u6240\u6709\u6743\u8f6c\u79fb\u7ed9\u5de5\u4f5c\u7ebf\u7a0b&#xff1b;<br \/>\n         * 2. connfd \u7684\u7ba1\u7406\u6743\u8f6c\u79fb\u7ed9\u5de5\u4f5c\u7ebf\u7a0b&#xff1b;<br \/>\n         * 3. \u4e3b\u7ebf\u7a0b\u4e0d\u80fd\u518d\u8bbf\u95ee client&#xff1b;<br \/>\n         * 4. \u4e3b\u7ebf\u7a0b\u4e0d\u80fd\u5173\u95ed connfd&#xff1b;<br \/>\n         * 5. \u4e3b\u7ebf\u7a0b\u7ee7\u7eed\u8c03\u7528 accept()\u3002<br \/>\n         *\/<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/*<br \/>\n     * \u5f53\u524d\u7a0b\u5e8f\u662f\u6c38\u4e45\u8fd0\u884c\u7684\u670d\u52a1\u5668&#xff0c;<br \/>\n     * \u6b63\u5e38\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u6267\u884c\u5230\u8fd9\u91cc\u3002<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token function\">pthread_attr_destroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> EXIT_SUCCESS<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h2>\u4e5d\u3001\u4ee3\u7801\u4e2d\u7684\u53c2\u6570\u6240\u6709\u6743<\/h2>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4e2d\u6700\u91cd\u8981\u7684\u662f\u8d44\u6e90\u6240\u6709\u6743\u3002<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span>client <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6b64\u65f6\u8d44\u6e90\u5c5e\u4e8e\u4e3b\u7ebf\u7a0b\u3002<\/p>\n<p>\u7136\u540e\u4e3b\u7ebf\u7a0b\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token operator\">&amp;<\/span>thread_attr<span class=\"token punctuation\">,<\/span><br \/>\n                         worker<span class=\"token punctuation\">,<\/span><br \/>\n                         client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u5982\u679c\u7ebf\u7a0b\u521b\u5efa\u5931\u8d25<\/h3>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7531\u4e8e\u5de5\u4f5c\u7ebf\u7a0b\u6ca1\u6709\u521b\u5efa\u6210\u529f&#xff0c;\u6240\u4ee5\u8d44\u6e90\u4ecd\u7531\u4e3b\u7ebf\u7a0b\u8d1f\u8d23\u91ca\u653e\u3002<\/p>\n<hr \/>\n<h3>\u5982\u679c\u7ebf\u7a0b\u521b\u5efa\u6210\u529f<\/h3>\n<p>\u7ebf\u7a0b\u521b\u5efa\u6210\u529f\u540e&#xff1a;<\/p>\n<p>ClientInfo \u6240\u6709\u6743 \u2500\u2500&gt; \u5de5\u4f5c\u7ebf\u7a0b<br \/>\nconnfd \u7ba1\u7406\u6743     \u2500\u2500&gt; \u5de5\u4f5c\u7ebf\u7a0b<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u4e0d\u80fd\u518d\u8bbf\u95ee&#xff1a;<\/p>\n<p>client<\/p>\n<p>\u4e5f\u4e0d\u80fd\u5173\u95ed&#xff1a;<\/p>\n<p>connfd<\/p>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u8bfb\u53d6\u53c2\u6570&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>connfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> client_addr <span class=\"token operator\">&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7136\u540e\u91ca\u653e\u52a8\u6001\u5185\u5b58&#xff1a;<\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6700\u540e\u5728\u901a\u4fe1\u7ed3\u675f\u65f6\u5173\u95ed\u5957\u63a5\u5b57&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b8c\u6574\u751f\u547d\u5468\u671f\u5982\u4e0b&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b malloc()<br \/>\n    \u2193<br \/>\n\u4e3b\u7ebf\u7a0b accept()<br \/>\n    \u2193<br \/>\n\u4e3b\u7ebf\u7a0b pthread_create()<br \/>\n    \u2193<br \/>\n\u53c2\u6570\u6240\u6709\u6743\u8f6c\u79fb\u7ed9\u5de5\u4f5c\u7ebf\u7a0b<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b\u8bfb\u53d6\u53c2\u6570<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b free()<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b recv()\/send()<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b close()<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b\u9000\u51fa<\/p>\n<hr \/>\n<h2>\u5341\u3001\u4e3a\u4ec0\u4e48\u4e0d\u518d\u4f7f\u7528\u5168\u5c40\u6570\u7ec4<\/h2>\n<p>\u539f\u59cb\u4ee3\u7801\u4f7f\u7528\u4e86&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SockInfo<\/span> infos<span class=\"token punctuation\">[<\/span><span class=\"token number\">128<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7136\u540e\u901a\u8fc7&#xff1a;<\/p>\n<p>infos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><\/p>\n<p>\u5224\u65ad\u6570\u7ec4\u69fd\u4f4d\u662f\u5426\u7a7a\u95f2\u3002<\/p>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u4e0d\u662f\u7edd\u5bf9\u4e0d\u80fd\u4f7f\u7528&#xff0c;\u4f46\u5b83\u4f1a\u5f15\u5165\u989d\u5916\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u7ebf\u7a0b\u548c\u5de5\u4f5c\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u6570\u7ec4&#xff1b;<\/li>\n<li>\u9700\u8981\u4e92\u65a5\u9501\u6216\u539f\u5b50\u53d8\u91cf&#xff1b;<\/li>\n<li>\u9700\u8981\u8003\u8651\u69fd\u4f4d\u56de\u6536&#xff1b;<\/li>\n<li>\u9700\u8981\u8003\u8651\u7ebf\u7a0b\u9000\u51fa\u65f6\u673a&#xff1b;<\/li>\n<li>\u9700\u8981\u8003\u8651\u6587\u4ef6\u63cf\u8ff0\u7b26\u5173\u95ed\u987a\u5e8f&#xff1b;<\/li>\n<li>\u540c\u65f6\u8fde\u63a5\u6570\u88ab\u56fa\u5b9a\u4e3a 128&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u7ed3\u675f\u4e0e\u69fd\u4f4d\u590d\u7528\u4e4b\u95f4\u5bb9\u6613\u4ea7\u751f\u7ade\u4e89\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982&#xff0c;\u4e0d\u80fd\u7b80\u5355\u6267\u884c&#xff1a;<\/p>\n<p>info<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u56e0\u4e3a\u6b64\u65f6\u5b9e\u9645\u4e0a\u53d8\u6210\u4e86&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e5f\u4e0d\u80fd\u8f7b\u6613\u5199\u6210&#xff1a;<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ninfo<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u56e0\u4e3a\u4e3b\u7ebf\u7a0b\u53ef\u80fd\u5728\u6ca1\u6709\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\u770b\u5230 -1&#xff0c;\u7acb\u5373\u590d\u7528\u8be5\u7ed3\u6784&#xff0c;\u800c\u65e7\u7ebf\u7a0b\u53ef\u80fd\u8fd8\u6ca1\u6709\u5b8c\u5168\u7ed3\u675f\u3002<\/p>\n<p>\u5982\u679c\u786e\u5b9e\u9700\u8981\u7ef4\u62a4\u5728\u7ebf\u5ba2\u6237\u7aef\u5217\u8868&#xff0c;\u53ef\u4ee5\u4f7f\u7528&#xff1a;<\/p>\n<ul>\n<li>\u4e92\u65a5\u9501&#xff1b;<\/li>\n<li>\u6761\u4ef6\u53d8\u91cf&#xff1b;<\/li>\n<li>\u539f\u5b50\u72b6\u6001&#xff1b;<\/li>\n<li>\u72ec\u7acb\u8fde\u63a5\u7ba1\u7406\u5668&#xff1b;<\/li>\n<li>\u5f15\u7528\u8ba1\u6570&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u6c60\u4efb\u52a1\u961f\u5217\u3002<\/li>\n<\/ul>\n<p>\u4f46\u5bf9\u4e8e\u6559\u5b66\u7248\u201c\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u201d\u670d\u52a1\u5668&#xff0c;\u52a8\u6001\u5206\u914d\u72ec\u7acb\u53c2\u6570\u66f4\u52a0\u6e05\u6670\u3002<\/p>\n<hr \/>\n<h2>\u5341\u4e00\u3001recv() \u4e3a\u4ec0\u4e48\u53ef\u80fd\u4e00\u6b21\u8bfb\u4e0d\u5b8c\u6574<\/h2>\n<p>TCP \u662f\u5b57\u8282\u6d41\u534f\u8bae&#xff0c;\u4e0d\u4fdd\u7559\u5e94\u7528\u5c42\u6d88\u606f\u8fb9\u754c\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u670d\u52a1\u5668\u53ef\u80fd\u6536\u5230&#xff1a;<\/p>\n<p>\u7b2c\u4e00\u6b21 recv()&#xff1a;hello<br \/>\n\u7b2c\u4e8c\u6b21 recv()&#xff1a;world<\/p>\n<p>\u4e5f\u53ef\u80fd\u6536\u5230&#xff1a;<\/p>\n<p>\u7b2c\u4e00\u6b21 recv()&#xff1a;helloworld<\/p>\n<p>\u8fd8\u53ef\u80fd\u6536\u5230&#xff1a;<\/p>\n<p>\u7b2c\u4e00\u6b21 recv()&#xff1a;he<br \/>\n\u7b2c\u4e8c\u6b21 recv()&#xff1a;llow<br \/>\n\u7b2c\u4e09\u6b21 recv()&#xff1a;orld<\/p>\n<p>TCP \u53ea\u4fdd\u8bc1&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u53ef\u9760\u5230\u8fbe&#xff1b;<\/li>\n<li>\u6570\u636e\u6709\u5e8f&#xff1b;<\/li>\n<li>\u4e0d\u91cd\u590d&#xff1b;<\/li>\n<li>\u4e0d\u4e22\u5931&#xff0c;\u6216\u8005\u6700\u7ec8\u62a5\u544a\u8fde\u63a5\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>TCP \u4e0d\u4fdd\u8bc1&#xff1a;<\/p>\n<p>\u4e00\u6b21 send() \u5bf9\u5e94\u4e00\u6b21 recv()<\/p>\n<p>\u5f53\u524d\u793a\u4f8b\u662f\u56de\u663e\u670d\u52a1\u5668&#xff0c;\u56e0\u6b64\u4e0d\u9700\u8981\u533a\u5206\u4e1a\u52a1\u6d88\u606f\u8fb9\u754c&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> \u8fd4\u56de\u591a\u5c11\u5b57\u8282<br \/>\n    \u2193<br \/>\n\u5c31\u56de\u5199\u591a\u5c11\u5b57\u8282<\/p>\n<p>\u5982\u679c\u5b9e\u73b0\u804a\u5929\u534f\u8bae\u3001\u6587\u4ef6\u4f20\u8f93\u534f\u8bae\u6216\u8bf7\u6c42\u54cd\u5e94\u534f\u8bae&#xff0c;\u5219\u5fc5\u987b\u81ea\u884c\u8bbe\u8ba1\u6d88\u606f\u8fb9\u754c&#xff0c;\u4f8b\u5982&#xff1a;<\/p>\n<p>\u56fa\u5b9a\u957f\u5ea6<\/p>\n<p>\u6216\u8005&#xff1a;<\/p>\n<p>\u6d88\u606f\u957f\u5ea6 &#043; \u6d88\u606f\u5185\u5bb9<\/p>\n<p>\u6216\u8005&#xff1a;<\/p>\n<p>\u4ee5\u6362\u884c\u7b26\u7ed3\u5c3e<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>4 \u5b57\u8282\u957f\u5ea6\u5b57\u6bb5<br \/>\n    &#043;<br \/>\nN \u5b57\u8282\u6d88\u606f\u4f53<\/p>\n<hr \/>\n<h2>\u5341\u4e8c\u3001\u4e3a\u4ec0\u4e48\u5de5\u4f5c\u7ebf\u7a0b\u963b\u585e\u4e0d\u4f1a\u5f71\u54cd\u4e3b\u7ebf\u7a0b<\/h2>\n<p>\u5de5\u4f5c\u7ebf\u7a0b\u53ef\u80fd\u963b\u585e\u5728&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e3b\u7ebf\u7a0b\u53ef\u80fd\u963b\u585e\u5728&#xff1a;<\/p>\n<p><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u867d\u7136\u5b83\u4eec\u5c5e\u4e8e\u540c\u4e00\u4e2a\u8fdb\u7a0b&#xff0c;\u4f46\u5b83\u4eec\u662f\u4e0d\u540c\u7684\u6267\u884c\u6d41\u3002<\/p>\n<p>\u5f53\u7ebf\u7a0b A \u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u800c\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u6682\u65f6\u6ca1\u6709\u6570\u636e\u65f6&#xff0c;\u5185\u6838\u53ea\u4f1a\u6302\u8d77\u7ebf\u7a0b A\u3002<\/p>\n<p>\u7ebf\u7a0b B \u548c\u4e3b\u7ebf\u7a0b\u4ecd\u7136\u53ef\u4ee5\u7ee7\u7eed\u8fd0\u884c&#xff1a;<\/p>\n<p>\u7ebf\u7a0b A&#xff1a;<br \/>\n    \u963b\u585e\u7b49\u5f85 connfd&#061;4 \u7684\u6570\u636e<\/p>\n<p>\u7ebf\u7a0b B&#xff1a;<br \/>\n    \u5904\u7406 connfd&#061;5 \u7684\u6570\u636e<\/p>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    \u7b49\u5f85 listenfd&#061;3 \u4e0a\u7684\u65b0\u8fde\u63a5<\/p>\n<p>\u5f53\u5ba2\u6237\u7aef A \u53d1\u9001\u6570\u636e\u540e&#xff0c;\u7f51\u5361\u63a5\u6536\u6570\u636e&#xff0c;TCP \u534f\u8bae\u6808\u5904\u7406\u62a5\u6587&#xff0c;\u5e76\u628a\u6570\u636e\u653e\u5165\u8fde\u63a5 4 \u5bf9\u5e94\u7684\u63a5\u6536\u7f13\u51b2\u533a\u3002<\/p>\n<p>\u5185\u6838\u968f\u540e\u5524\u9192\u6b63\u5728\u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26 4 \u7684\u7ebf\u7a0b A\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u591a\u4e2a\u5ba2\u6237\u7aef\u80fd\u591f\u5e76\u53d1\u901a\u4fe1\u7684\u539f\u56e0\u3002<\/p>\n<hr \/>\n<h2>\u5341\u4e09\u3001\u5206\u79bb\u7ebf\u7a0b\u7684\u4f5c\u7528<\/h2>\n<p>\u7ebf\u7a0b\u9ed8\u8ba4\u662f\u53ef\u8fde\u63a5\u7ebf\u7a0b\u3002<\/p>\n<p>\u53ef\u8fde\u63a5\u7ebf\u7a0b\u9000\u51fa\u540e&#xff0c;\u4e3b\u7ebf\u7a0b\u9700\u8981\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_join<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u56de\u6536\u7ebf\u7a0b\u8d44\u6e90\u3002<\/p>\n<p>\u4f46\u662f\u670d\u52a1\u5668\u4e0d\u80fd\u5728\u6bcf\u6b21\u521b\u5efa\u7ebf\u7a0b\u540e\u7acb\u5373\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_join<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5426\u5219\u4e3b\u7ebf\u7a0b\u4f1a\u7b49\u5f85\u8be5\u5ba2\u6237\u7aef\u7ebf\u7a0b\u7ed3\u675f&#xff0c;\u65e0\u6cd5\u7ee7\u7eed\u8c03\u7528 accept()\u3002<\/p>\n<p>\u9519\u8bef\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker<span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">pthread_join<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u5b9e\u9645\u4e0a\u53c8\u9000\u5316\u6210\u4e86\u4e32\u884c\u670d\u52a1\u5668\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u53ef\u4ee5\u5c06\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u5206\u79bb\u72b6\u6001&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_attr_setdetachstate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>attr<span class=\"token punctuation\">,<\/span><br \/>\n                            PTHREAD_CREATE_DETACHED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5206\u79bb\u7ebf\u7a0b\u9000\u51fa\u65f6&#xff0c;\u7cfb\u7edf\u81ea\u52a8\u56de\u6536\u7ebf\u7a0b\u81ea\u8eab\u7684\u90e8\u5206\u8d44\u6e90\u3002<\/p>\n<p>\u4f46\u4ecd\u9700\u6ce8\u610f&#xff1a;<\/p>\n<p>\u5206\u79bb\u7ebf\u7a0b\u4e0d\u80fd\u518d\u6b21\u8c03\u7528 pthread_join()\u3002<\/p>\n<p>\u5206\u79bb\u7ebf\u7a0b\u4e5f\u4e0d\u4f1a\u81ea\u52a8\u5173\u95ed\u4e1a\u52a1\u5957\u63a5\u5b57\u548c\u91ca\u653e\u4e1a\u52a1\u5185\u5b58\u3002<\/p>\n<hr \/>\n<h2>\u5341\u56db\u3001\u7f16\u8bd1\u548c\u8fd0\u884c<\/h2>\n<p>\u5c06\u4ee3\u7801\u4fdd\u5b58\u4e3a&#xff1a;<\/p>\n<p>thread_server.c<\/p>\n<p>\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u7f16\u8bd1&#xff1a;<\/p>\n<p>gcc thread_server.c <span class=\"token parameter variable\">-o<\/span> thread_server <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token parameter variable\">-std<\/span><span class=\"token operator\">&#061;<\/span>c11 <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token parameter variable\">-Wall<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token parameter variable\">-Wextra<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token parameter variable\">-Wpedantic<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token parameter variable\">-pthread<\/span><\/p>\n<p>\u8fd0\u884c\u670d\u52a1\u5668&#xff1a;<\/p>\n<p>.\/thread_server<\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>\u670d\u52a1\u5668\u542f\u52a8\u6210\u529f&#xff0c;\u76d1\u542c\u7aef\u53e3&#xff1a;8989<br \/>\nlistenfd&#061;3<\/p>\n<hr \/>\n<h3>\u4f7f\u7528 nc \u6d4b\u8bd5<\/h3>\n<p>\u6253\u5f00\u7b2c\u4e00\u4e2a\u7ec8\u7aef&#xff1a;<\/p>\n<p><span class=\"token function\">nc<\/span> <span class=\"token number\">127.0<\/span>.0.1 <span class=\"token number\">8989<\/span><\/p>\n<p>\u8f93\u5165&#xff1a;<\/p>\n<p>hello client 1<\/p>\n<p>\u670d\u52a1\u5668\u4f1a\u5c06\u6570\u636e\u539f\u6837\u8fd4\u56de\u3002<\/p>\n<p>\u518d\u6253\u5f00\u7b2c\u4e8c\u4e2a\u7ec8\u7aef&#xff1a;<\/p>\n<p><span class=\"token function\">nc<\/span> <span class=\"token number\">127.0<\/span>.0.1 <span class=\"token number\">8989<\/span><\/p>\n<p>\u8f93\u5165&#xff1a;<\/p>\n<p>hello client 2<\/p>\n<p>\u4e24\u4e2a\u5ba2\u6237\u7aef\u53ef\u4ee5\u540c\u65f6\u4fdd\u6301\u8fde\u63a5\u5e76\u53d1\u9001\u6570\u636e\u3002<\/p>\n<p>\u670d\u52a1\u5668\u53ef\u80fd\u8f93\u51fa&#xff1a;<\/p>\n<p>[\u7ebf\u7a0b 140232445667072] \u5ba2\u6237\u7aef\u5df2\u8fde\u63a5&#xff1a;127.0.0.1:53120&#xff0c;connfd&#061;4<br \/>\n[\u7ebf\u7a0b 140232437274368] \u5ba2\u6237\u7aef\u5df2\u8fde\u63a5&#xff1a;127.0.0.1:53124&#xff0c;connfd&#061;5<br \/>\n[\u7ebf\u7a0b 140232445667072] \u4ece 127.0.0.1:53120 \u63a5\u6536\u5230 15 \u5b57\u8282<br \/>\n[\u7ebf\u7a0b 140232437274368] \u4ece 127.0.0.1:53124 \u63a5\u6536\u5230 15 \u5b57\u8282<\/p>\n<hr \/>\n<h2>\u5341\u4e94\u3001\u5fc5\u987b\u8bb0\u4f4f\u7684\u6838\u5fc3\u7ed3\u8bba<\/h2>\n<h3>1. listenfd \u548c connfd \u4e0d\u662f\u540c\u4e00\u4e2a\u5957\u63a5\u5b57<\/h3>\n<p>listenfd&#xff1a;<br \/>\n    \u63a5\u6536\u65b0\u8fde\u63a5<\/p>\n<p>connfd&#xff1a;<br \/>\n    \u4e0e\u67d0\u4e2a\u5ba2\u6237\u7aef\u901a\u4fe1<\/p>\n<hr \/>\n<h3>2. \u6bcf\u6b21 accept() \u90fd\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u901a\u4fe1\u5957\u63a5\u5b57<\/h3>\n<p>\u7b2c\u4e00\u6b21 accept() \u2500\u2500&gt; connfd 4<br \/>\n\u7b2c\u4e8c\u6b21 accept() \u2500\u2500&gt; connfd 5<br \/>\n\u7b2c\u4e09\u6b21 accept() \u2500\u2500&gt; connfd 6<\/p>\n<hr \/>\n<h3>3. \u4e3b\u7ebf\u7a0b\u53ea\u8d1f\u8d23\u63a5\u6536\u8fde\u63a5<\/h3>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<br \/>\n    accept()<br \/>\n    \u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b<br \/>\n    \u7ee7\u7eed accept()<\/p>\n<hr \/>\n<h3>4. \u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u8d1f\u8d23\u4e00\u4e2a\u5ba2\u6237\u7aef<\/h3>\n<p>\u7ebf\u7a0b A \u2500\u2500&gt; \u5ba2\u6237\u7aef A<br \/>\n\u7ebf\u7a0b B \u2500\u2500&gt; \u5ba2\u6237\u7aef B<br \/>\n\u7ebf\u7a0b C \u2500\u2500&gt; \u5ba2\u6237\u7aef C<\/p>\n<hr \/>\n<h3>5. \u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u4e3b\u7ebf\u7a0b\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf<\/h3>\n<p>\u4e3b\u7ebf\u7a0b\u4e2d\u7684&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> connfd<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53ef\u4ee5\u53cd\u590d\u8d4b\u503c\u3002<\/p>\n<p>\u5173\u952e\u662f\u8981\u5728\u521b\u5efa\u7ebf\u7a0b\u524d&#xff0c;\u628a\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c\u590d\u5236\u5230\u72ec\u7acb\u53c2\u6570\u4e2d\u3002<\/p>\n<hr \/>\n<h3>6. \u4e0d\u80fd\u628a\u540c\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u5730\u5740\u4f20\u7ed9\u591a\u4e2a\u7ebf\u7a0b<\/h3>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6b63\u786e&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClientInfo<\/span> <span class=\"token operator\">*<\/span>client <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nclient<span class=\"token operator\">-&gt;<\/span>connfd <span class=\"token operator\">&#061;<\/span> connfd<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker<span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>7. recv() \u8fd4\u56de\u591a\u5c11\u5b57\u8282&#xff0c;\u5c31\u5904\u7406\u591a\u5c11\u5b57\u8282<\/h3>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6b63\u786e&#xff1a;<\/p>\n<p><span class=\"token class-name\">ssize_t<\/span> received <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">send_all<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span><span class=\"token punctuation\">)<\/span>received<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>8. \u5de5\u4f5c\u7ebf\u7a0b\u5fc5\u987b\u5173\u95ed\u901a\u4fe1\u5957\u63a5\u5b57<\/h3>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4ec5\u4ec5\u8bbe\u7f6e&#xff1a;<\/p>\n<p>connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e0d\u4f1a\u91ca\u653e\u4efb\u4f55\u5185\u6838\u8d44\u6e90\u3002<\/p>\n<hr \/>\n<h2>\u5341\u516d\u3001\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u6a21\u578b\u7684\u5c40\u9650<\/h2>\n<p>\u201c\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u201d\u6a21\u578b\u7ed3\u6784\u7b80\u5355&#xff0c;\u9002\u5408&#xff1a;<\/p>\n<ul>\n<li>\u5b66\u4e60 TCP \u7f51\u7edc\u7f16\u7a0b&#xff1b;<\/li>\n<li>\u5ba2\u6237\u7aef\u6570\u91cf\u8f83\u5c11&#xff1b;<\/li>\n<li>\u5185\u90e8\u7ba1\u7406\u7a0b\u5e8f&#xff1b;<\/li>\n<li>\u5e76\u53d1\u89c4\u6a21\u8f83\u5c0f&#xff1b;<\/li>\n<li>\u5ba2\u6237\u7aef\u9700\u8981\u957f\u65f6\u95f4\u963b\u585e\u7b49\u5f85\u3002<\/li>\n<\/ul>\n<p>\u4f46\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u9700\u8981&#xff1a;<\/p>\n<ul>\n<li>\u72ec\u7acb\u7ebf\u7a0b\u6808&#xff1b;<\/li>\n<li>\u5185\u6838\u8c03\u5ea6\u8d44\u6e90&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u63a7\u5236\u7ed3\u6784&#xff1b;<\/li>\n<li>\u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500\u3002<\/li>\n<\/ul>\n<p>\u5f53\u8fde\u63a5\u6570\u8fbe\u5230\u51e0\u5343\u751a\u81f3\u51e0\u4e07\u65f6&#xff0c;\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u901a\u5e38\u4e0d\u518d\u5408\u9002\u3002<\/p>\n<p>\u751f\u4ea7\u73af\u5883\u4e2d\u5e38\u89c1\u7684\u6a21\u578b\u5305\u62ec&#xff1a;<\/p>\n<p>\u7ebf\u7a0b\u6c60 &#043; \u4efb\u52a1\u961f\u5217<\/p>\n<p>\u4ee5\u53ca&#xff1a;<\/p>\n<p>epoll &#043; \u975e\u963b\u585e socket<\/p>\n<p>\u6216\u8005&#xff1a;<\/p>\n<p>epoll &#043; \u7ebf\u7a0b\u6c60<\/p>\n<p>\u5b83\u4eec\u53ef\u4ee5\u4f7f\u7528\u5c11\u91cf\u7ebf\u7a0b\u5904\u7406\u5927\u91cf\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<p>\u4e0d\u8fc7\u5728\u5b66\u4e60\u9636\u6bb5&#xff0c;\u5efa\u8bae\u5148\u5f7b\u5e95\u7406\u89e3&#xff1a;<\/p>\n<p>\u4e3b\u7ebf\u7a0b accept()<br \/>\n    &#043;<br \/>\n\u6bcf\u4e2a\u5de5\u4f5c\u7ebf\u7a0b recv()\/send()<\/p>\n<p>\u638c\u63e1\u7ebf\u7a0b\u53c2\u6570\u4f20\u9012\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u6240\u6709\u6743\u548c\u8d44\u6e90\u91ca\u653e\u540e&#xff0c;\u518d\u7ee7\u7eed\u5b66\u4e60\u7ebf\u7a0b\u6c60\u4e0e epoll\u3002<\/p>\n<hr \/>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668\u7684\u6838\u5fc3\u5e76\u4e0d\u590d\u6742&#xff1a;<\/p>\n<p>\u76d1\u542c\u5957\u63a5\u5b57\u53ea\u8d1f\u8d23\u63a5\u6536\u8fde\u63a5<br \/>\n    \u2193<br \/>\naccept() \u8fd4\u56de\u901a\u4fe1\u5957\u63a5\u5b57<br \/>\n    \u2193<br \/>\n\u4e3b\u7ebf\u7a0b\u4e3a\u8fde\u63a5\u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b\u4f7f\u7528\u901a\u4fe1\u5957\u63a5\u5b57\u6536\u53d1\u6570\u636e<br \/>\n    \u2193<br \/>\n\u5ba2\u6237\u7aef\u65ad\u5f00<br \/>\n    \u2193<br \/>\n\u5de5\u4f5c\u7ebf\u7a0b\u5173\u95ed\u5957\u63a5\u5b57\u5e76\u9000\u51fa<\/p>\n<p>\u771f\u6b63\u5bb9\u6613\u51fa\u9519\u7684\u662f\u7ebf\u7a0b\u4e4b\u95f4\u7684\u8d44\u6e90\u7ba1\u7406&#xff1a;<\/p>\n<ul>\n<li>\u4e0d\u8981\u628a\u540c\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u5730\u5740\u4f20\u9012\u7ed9\u591a\u4e2a\u7ebf\u7a0b&#xff1b;<\/li>\n<li>\u4e0d\u8981\u4f7f\u7528 strlen() \u5904\u7406 recv() \u5f97\u5230\u7684\u539f\u59cb\u6570\u636e&#xff1b;<\/li>\n<li>\u4e0d\u8981\u5fd8\u8bb0\u5904\u7406\u90e8\u5206\u53d1\u9001&#xff1b;<\/li>\n<li>\u4e0d\u8981\u5fd8\u8bb0\u5173\u95ed\u901a\u4fe1\u5957\u63a5\u5b57&#xff1b;<\/li>\n<li>\u4e0d\u8981\u5728\u6ca1\u6709\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\u8bfb\u5199\u5171\u4eab\u6570\u7ec4&#xff1b;<\/li>\n<li>\u4e0d\u8981\u5728\u7ebf\u7a0b\u521b\u5efa\u6210\u529f\u540e\u8ba9\u4e3b\u7ebf\u7a0b\u7ee7\u7eed\u64cd\u4f5c\u8be5\u8fde\u63a5&#xff1b;<\/li>\n<li>\u5206\u79bb\u7ebf\u7a0b\u53ea\u4f1a\u81ea\u52a8\u56de\u6536\u7ebf\u7a0b\u8d44\u6e90&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u91ca\u653e\u4e1a\u52a1\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p>\u53ea\u8981\u660e\u786e\u4e0b\u9762\u8fd9\u6761\u6240\u6709\u6743\u89c4\u5219&#xff0c;\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5c31\u4f1a\u6e05\u6670\u5f88\u591a&#xff1a;<\/p>\n<p>\u76d1\u542c\u5957\u63a5\u5b57\u5c5e\u4e8e\u4e3b\u7ebf\u7a0b&#xff1b;\u901a\u4fe1\u5957\u63a5\u5b57\u5728\u7ebf\u7a0b\u521b\u5efa\u6210\u529f\u540e\u5c5e\u4e8e\u5bf9\u5e94\u7684\u5de5\u4f5c\u7ebf\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u4ece accept() \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668\u4e8c\u3001\u5148\u533a\u5206\u56db\u4e2a\u91cd\u8981\u6982\u5ff52.1 \u4e3b\u7ebf\u7a0b2.2 \u5de5\u4f5c\u7ebf\u7a0b2.3 \u76d1\u542c\u5957\u63a5\u5b57 listenfd2.4 \u901a\u4fe1\u5957\u63a5\u5b57 connfd\u4e09\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u7684\u5b8c\u6574\u8fd0\u884c\u6d41\u7a0b\u7b2c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u56db\u3001\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u4ec0\u4e48&#xff0c;\u72ec\u5360\u4ec0\u4e484.1 \u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u62e5\u6709\u7684\u8d44\u6e904.2 \u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u8d44\u6e90\u4e94\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u5171\u4eab\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\u591a\u8fdb\u7a0b\u548c\u591a\u7ebf\u7a0b\u7684\u6587\u4ef6\u63cf<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,58,43],"topic":[],"class_list":["post-83264","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-linux","tag-43"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668\uff1a\u4ece `accept()` \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/83264.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668\uff1a\u4ece `accept()` \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u76ee\u5f55Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u4ece accept() \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u7ebf\u7a0b TCP \u670d\u52a1\u5668\u4e8c\u3001\u5148\u533a\u5206\u56db\u4e2a\u91cd\u8981\u6982\u5ff52.1 \u4e3b\u7ebf\u7a0b2.2 \u5de5\u4f5c\u7ebf\u7a0b2.3 \u76d1\u542c\u5957\u63a5\u5b57 listenfd2.4 \u901a\u4fe1\u5957\u63a5\u5b57 connfd\u4e09\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u7684\u5b8c\u6574\u8fd0\u884c\u6d41\u7a0b\u7b2c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u56db\u3001\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u4ec0\u4e48&#xff0c;\u72ec\u5360\u4ec0\u4e484.1 \u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u62e5\u6709\u7684\u8d44\u6e904.2 \u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u8d44\u6e90\u4e94\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u5171\u4eab\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\u591a\u8fdb\u7a0b\u548c\u591a\u7ebf\u7a0b\u7684\u6587\u4ef6\u63cf\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/83264.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-25T11:16:35+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/83264.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/83264.html\",\"name\":\"Linux C \u591a\u7ebf\u7a0b TCP \u5e76\u53d1\u670d\u52a1\u5668\uff1a\u4ece `accept()` \u5230\u5de5\u4f5c\u7ebf\u7a0b\u7684\u5b8c\u6574\u89e3\u6790 - 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