{"id":117739,"date":"2026-10-25T08:48:56","date_gmt":"2026-10-25T00:48:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/117739.html"},"modified":"2026-10-25T08:48:56","modified_gmt":"2026-10-25T00:48:56","slug":"c-%e4%bb%bfmuduo%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%9asocket%e6%a8%a1%e5%9d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/117739.html","title":{"rendered":"C++ \u4effmuduo\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\uff1aSocket\u6a21\u5757"},"content":{"rendered":"<p>        \/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/<br \/>\n        #content_views .toc,<br \/>\n        \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/<br \/>\n        #content_views.markdown_views &gt; p:empty:has(+ .toc),<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty,<br \/>\n        \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/<br \/>\n        #content_views.htmledit_views #main-toc,<br \/>\n        #content_views.htmledit_views #hr-toc,<br \/>\n        #content_views.htmledit_views p[id*=\\&#8221;-toc\\&#8221;] {<br \/>\n          display: none !important;<br \/>\n        }<br \/>\n        \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/<br \/>\n        #content_views.markdown_views &gt; .toc + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + h4,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h4 {<br \/>\n          margin-top: 0 !important;<br \/>\n        }<\/p>\n<h2>C&#043;&#043; \u4effmuduo\u9ad8\u5e76\u53d1\u670d\u52a1\u5668&#xff1a;Socket\u6a21\u5757<\/h2>\n<hr \/>\n<h3>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u5c01\u88c5 Socket&#xff1f;<\/h3>\n<p>Linux \u539f\u751f socket API \u662f\u4e00\u7ec4 C \u51fd\u6570&#xff0c;\u76f4\u63a5\u4f7f\u7528\u5b58\u5728\u4ee5\u4e0b\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u53c2\u6570\u590d\u6742&#xff0c;\u5bb9\u6613\u51fa\u9519&#xff08;\u5982 sockaddr \u7c7b\u578b\u8f6c\u6362\u3001\u5b57\u8282\u5e8f\u8f6c\u6362&#xff09;\u3002<\/li>\n<li>\u8d44\u6e90\u7ba1\u7406\u9ebb\u70e6&#xff08;fd \u9700\u8981\u624b\u52a8 close&#xff09;\u3002<\/li>\n<li>\u9519\u8bef\u5904\u7406\u91cd\u590d&#xff08;\u6bcf\u4e2a\u8c03\u7528\u90fd\u8981\u5224\u65ad\u8fd4\u56de\u503c\u3001\u6253\u5370\u65e5\u5fd7&#xff09;\u3002<\/li>\n<li>\u963b\u585e\/\u975e\u963b\u585e\u3001\u5730\u5740\u91cd\u7528\u7b49\u9009\u9879\u8bbe\u7f6e\u5206\u6563\u3002<\/li>\n<\/ul>\n<p>\u5c01\u88c5\u6210 Socket \u7c7b\u540e&#xff1a;<\/p>\n<ul>\n<li>\u63d0\u4f9b\u9762\u5411\u5bf9\u8c61\u7684\u63a5\u53e3&#xff0c;\u8bed\u4e49\u6e05\u6670\u3002<\/li>\n<li>\u5229\u7528 RAII \u81ea\u52a8\u5173\u95ed fd&#xff08;\u9700\u5b8c\u5584\u6790\u6784\u51fd\u6570&#xff09;\u3002<\/li>\n<li>\u7edf\u4e00\u9519\u8bef\u65e5\u5fd7\u8f93\u51fa\u3002<\/li>\n<li>\u65b9\u4fbf\u5728 Reactor \u6a21\u578b\u4e2d\u4f5c\u4e3a\u57fa\u7840\u7ec4\u4ef6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>2. \u7c7b\u5b9a\u4e49\u6982\u89c8<\/h3>\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\">MAX_LISTEN<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Socket<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">Socket<\/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\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">Socket<\/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\">int<\/span> <span class=\"token function\">Fd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _sockfd<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">Create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">Bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">Listen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> backlog <span class=\"token operator\">&#061;<\/span> MAX_LISTEN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">Connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span>  <span class=\"token function\">Accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    ssize_t <span class=\"token function\">Recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ssize_t <span class=\"token function\">NonBlockRecv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ssize_t <span class=\"token function\">Send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ssize_t <span class=\"token function\">NonBlockSend<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">CreaterServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">bool<\/span> block_flag <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">CreateClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">ReuseAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">NonBlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>3. \u6210\u5458\u53d8\u91cf\u4e0e\u6784\u9020\/\u6790\u6784<\/h3>\n<p><span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>_sockfd&#xff1a;\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;-1 \u8868\u793a\u65e0\u6548\u3002<\/li>\n<\/ul>\n<p><span class=\"token function\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span><span class=\"token function\">_sockfd<\/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><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_sockfd<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token operator\">~<\/span><span class=\"token function\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6790\u6784\u51fd\u6570&#xff1a;\u5e94\u8c03\u7528 Close() \u81ea\u52a8\u5173\u95ed fd&#xff0c;\u5f53\u524d\u4e3a\u7a7a&#xff0c;\u5b58\u5728\u8d44\u6e90\u6cc4\u6f0f\u98ce\u9669\u3002<\/li>\n<\/ul>\n<p>\u6539\u8fdb\u5efa\u8bae&#xff1a;\u540e\u671f\u6211\u4eec\u518d\u52a0\u4e0a<\/p>\n<p><span class=\"token operator\">~<\/span><span class=\"token function\">Socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>4. \u6838\u5fc3\u51fd\u6570\u8be6\u89e3<\/h3>\n<h4>4.1 Create()&#xff1a;\u521b\u5efa\u5957\u63a5\u5b57<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">Create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    _sockfd <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> IPPROTO_TCP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_sockfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;CREATE SOCKET FAILED!!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>AF_INET&#xff1a;IPv4 \u534f\u8bae\u65cf\u3002<\/li>\n<li>SOCK_STREAM&#xff1a;TCP \u6d41\u5f0f\u5957\u63a5\u5b57\u3002<\/li>\n<li>IPPROTO_TCP&#xff1a;TCP \u534f\u8bae\u3002<\/li>\n<li>\u6210\u529f\u8fd4\u56de\u975e\u8d1f fd&#xff0c;\u5931\u8d25\u8fd4\u56de -1\u3002<\/li>\n<\/ul>\n<h4>4.2 Bind()&#xff1a;\u7ed1\u5b9a\u5730\u5740<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">Bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <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    addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    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>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u7aef\u53e3\u8f6c\u7f51\u7edc\u5b57\u8282\u5e8f<\/span><br \/>\n    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\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ IP \u8f6c\u7f51\u7edc\u5b57\u8282\u5e8f<\/span><br \/>\n    socklen_t 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>    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> <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>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;BIND ADDRESS FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>htons&#xff1a;\u4e3b\u673a\u5b57\u8282\u5e8f \u2192 \u7f51\u7edc\u5b57\u8282\u5e8f&#xff08;16 \u4f4d&#xff09;\u3002<\/li>\n<li>inet_addr&#xff1a;\u70b9\u5206\u5341\u8fdb\u5236 IP \u2192 \u7f51\u7edc\u5b57\u8282\u5e8f 32 \u4f4d\u6574\u6570\u3002<\/li>\n<li>\u670d\u52a1\u5668\u5fc5\u987b bind&#xff0c;\u5ba2\u6237\u7aef\u901a\u5e38\u4e0d\u9700\u8981\u3002<\/li>\n<\/ul>\n<h4>4.3 Listen()&#xff1a;\u5f00\u59cb\u76d1\u542c<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">Listen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> backlog <span class=\"token operator\">&#061;<\/span> MAX_LISTEN<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\">listen<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> backlog<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SOCKET LISTEN FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>backlog&#xff1a;\u5df2\u5b8c\u6210\u8fde\u63a5\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6&#xff0c;\u9ed8\u8ba4 MAX_LISTEN&#xff08;1024&#xff09;\u3002<\/li>\n<li>\u5c06\u4e3b\u52a8\u5957\u63a5\u5b57\u53d8\u4e3a\u88ab\u52a8\u76d1\u542c\u5957\u63a5\u5b57&#xff0c;\u5185\u6838\u5f00\u59cb\u63a5\u53d7\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<h4>4.4 Connect()&#xff1a;\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">Connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <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    addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    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>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    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\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    socklen_t 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>    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> <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>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;CONNECT SERVER FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5411\u670d\u52a1\u5668\u53d1\u8d77 TCP \u8fde\u63a5&#xff0c;\u89e6\u53d1\u4e09\u6b21\u63e1\u624b\u3002<\/li>\n<li>\u963b\u585e\u6a21\u5f0f\u4e0b\u4f1a\u7b49\u5f85\u8fde\u63a5\u5b8c\u6210\u3002<\/li>\n<\/ul>\n<h4>4.5 Accept()&#xff1a;\u63a5\u53d7\u65b0\u8fde\u63a5<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">Accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> newfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>_sockfd<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>newfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SOCKET ACCEPT FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <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><br \/>\n    <span class=\"token keyword\">return<\/span> newfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u4ece\u5df2\u5b8c\u6210\u8fde\u63a5\u961f\u5217\u53d6\u51fa\u4e00\u4e2a\u8fde\u63a5&#xff0c;\u8fd4\u56de\u65b0\u7684\u901a\u4fe1 fd\u3002<\/li>\n<li>\u76d1\u542c fd \u7ee7\u7eed\u76d1\u542c&#xff0c;\u65b0 fd \u7528\u4e8e\u548c\u5ba2\u6237\u7aef\u901a\u4fe1\u3002<\/li>\n<li>\u975e\u963b\u585e\u6a21\u5f0f\u4e0b&#xff0c;\u65e0\u8fde\u63a5\u65f6\u8fd4\u56de -1&#xff0c;errno \u4e3a EAGAIN\u3002<\/li>\n<\/ul>\n<h4>4.6 Recv() \u4e0e NonBlockRecv()<\/h4>\n<p>ssize_t <span class=\"token function\">Recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    ssize_t ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EAGAIN <span class=\"token operator\">||<\/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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6682\u65f6\u65e0\u6570\u636e<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SCOKET RECV FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u62fc\u5199\u9519\u8bef&#xff1a;SCOKET -&gt; SOCKET<\/span><br \/>\n        <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><br \/>\n    <span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>ssize_t <span class=\"token function\">NonBlockRecv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">Recv<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> MSG_DONTWAIT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>recv \u8fd4\u56de\u5b9e\u9645\u63a5\u6536\u5b57\u8282\u6570\u3002<\/li>\n<li>ret &#061;&#061; 0&#xff1a;\u5bf9\u7aef\u5173\u95ed\u8fde\u63a5\u3002<\/li>\n<li>ret &lt; 0&#xff1a;\n<ul>\n<li>EAGAIN \/ EWOULDBLOCK&#xff1a;\u975e\u963b\u585e\u4e0b\u65e0\u6570\u636e\u3002<\/li>\n<li>EINTR&#xff1a;\u88ab\u4fe1\u53f7\u4e2d\u65ad\u3002<\/li>\n<li>\u5176\u4ed6&#xff1a;\u771f\u6b63\u9519\u8bef\u3002<\/li>\n<\/ul>\n<\/li>\n<li>MSG_DONTWAIT&#xff1a;\u672c\u6b21\u63a5\u6536\u975e\u963b\u585e&#xff0c;\u4e0d\u6539\u53d8\u5957\u63a5\u5b57\u6574\u4f53\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<h4>4.7 Send() \u4e0e NonBlockSend()<\/h4>\n<p>ssize_t <span class=\"token function\">Send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    ssize_t ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SOCKET SEND FAILED!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <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><br \/>\n    <span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>ssize_t <span class=\"token function\">NonBlockSend<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">Send<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> MSG_DONTWAIT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u8fd4\u56de\u5b9e\u9645\u53d1\u9001\u5b57\u8282\u6570\u3002<\/li>\n<li>\u975e\u963b\u585e\u4e0b\u53ef\u80fd\u53ea\u53d1\u9001\u90e8\u5206\u6570\u636e&#xff0c;\u9700\u8981\u5e94\u7528\u5c42\u7f13\u51b2\u5269\u4f59\u6570\u636e\u3002<\/li>\n<li>SIGPIPE \u4fe1\u53f7\u9700\u5ffd\u7565&#xff0c;\u5426\u5219\u5411\u5df2\u5173\u95ed\u8fde\u63a5\u53d1\u9001\u4f1a\u5d29\u6e83\u3002<\/li>\n<\/ul>\n<h4>4.8 Close()&#xff1a;\u5173\u95ed\u5957\u63a5\u5b57<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_sockfd <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>_sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    _sockfd <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 punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5173\u95ed fd&#xff0c;\u7f6e\u4e3a -1&#xff0c;\u9632\u6b62\u91cd\u590d\u5173\u95ed\u3002<\/li>\n<\/ul>\n<h4>4.9 CreaterServer()&#xff1a;\u4e00\u952e\u521b\u5efa\u670d\u52a1\u7aef<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">CreaterServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">bool<\/span> block_flag <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">Create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>block_flag<span class=\"token punctuation\">)<\/span> <span class=\"token function\">NonBlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u6ce8\u610f&#xff1a;block_flag \u4e3a true \u65f6\u53cd\u800c\u8bbe\u975e\u963b\u585e&#xff0c;\u547d\u540d\u76f8\u53cd<\/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>ip<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/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><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">ReuseAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                      <span class=\"token comment\">\/\/ \u5efa\u8bae\u79fb\u5230 Bind \u4e4b\u524d<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u9ed8\u8ba4 ip &#061; &#034;0.0.0.0&#034; \u76d1\u542c\u6240\u6709\u7f51\u5361\u3002<\/li>\n<li>block_flag \u547d\u540d\u6709\u6b67\u4e49&#xff0c;\u5b9e\u9645 true \u8868\u793a\u975e\u963b\u585e\u3002<\/li>\n<li>ReuseAddress() \u5e94\u5728 Bind() \u524d\u8c03\u7528\u3002<\/li>\n<\/ul>\n<h4>4.10 CreateClient()&#xff1a;\u4e00\u952e\u521b\u5efa\u5ba2\u6237\u7aef<\/h4>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">CreateClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">Create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">Connect<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.11 ReuseAddress()&#xff1a;\u5730\u5740\u7aef\u53e3\u91cd\u7528<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">ReuseAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEADDR<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>val<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEPORT<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>val<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>SO_REUSEADDR&#xff1a;\u5141\u8bb8\u7ed1\u5b9a\u5904\u4e8e TIME_WAIT \u7684\u7aef\u53e3&#xff0c;\u670d\u52a1\u5668\u53ef\u7acb\u5373\u91cd\u542f\u3002<\/li>\n<li>SO_REUSEPORT&#xff1a;\u5141\u8bb8\u591a\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u76f8\u540c IP:\u7aef\u53e3&#xff0c;\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\u3002<\/li>\n<li>val &#061; 1 \u8868\u793a\u5f00\u542f\u9009\u9879&#xff0c;0 \u8868\u793a\u5173\u95ed\u3002<\/li>\n<li>SOL_SOCKET&#xff1a;\u901a\u7528\u5957\u63a5\u5b57\u5c42\u9009\u9879\u3002<\/li>\n<\/ul>\n<h4>4.12 NonBlock()&#xff1a;\u8bbe\u7f6e\u975e\u963b\u585e<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">NonBlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> F_GETFL<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\">fcntl<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> F_SETFL<span class=\"token punctuation\">,<\/span> flag <span class=\"token operator\">|<\/span> O_NONBLOCK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u83b7\u53d6\u5f53\u524d\u6587\u4ef6\u72b6\u6001\u6807\u5fd7&#xff0c;\u52a0\u4e0a O_NONBLOCK&#xff0c;\u518d\u8bbe\u7f6e\u56de\u53bb\u3002<\/li>\n<li>\u975e\u963b\u585e\u662f Reactor \u6a21\u578b\u7684\u57fa\u7840&#xff0c;\u9632\u6b62 accept\/recv\/send \u963b\u585e EventLoop \u7ebf\u7a0b\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>5. \u5173\u952e\u77e5\u8bc6\u70b9<\/h3>\n<table>\n<tr>\u77e5\u8bc6\u70b9\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u5b57\u8282\u5e8f\u8f6c\u6362<\/td>\n<td align=\"left\">htons \/ htonl \u4e3b\u673a\u8f6c\u7f51\u7edc&#xff0c;ntohs \/ ntohl \u7f51\u7edc\u8f6c\u4e3b\u673a<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5730\u5740\u8f6c\u6362<\/td>\n<td align=\"left\">inet_addr \u5b57\u7b26\u4e32\u8f6c\u7f51\u7edc\u5b57\u8282\u5e8f&#xff0c;\u63a8\u8350 inet_pton<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u9519\u8bef\u5904\u7406<\/td>\n<td align=\"left\">errno&#xff0c;EAGAIN \/ EWOULDBLOCK \u8868\u793a\u975e\u963b\u585e\u65e0\u6570\u636e&#xff0c;EINTR \u8868\u793a\u88ab\u4fe1\u53f7\u4e2d\u65ad<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u963b\u585e vs \u975e\u963b\u585e<\/td>\n<td align=\"left\">\u975e\u963b\u585e\u914d\u5408 epoll&#xff0c;\u907f\u514d\u7ebf\u7a0b\u5361\u6b7b<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5730\u5740\u91cd\u7528<\/td>\n<td align=\"left\">SO_REUSEADDR \u89e3\u51b3 TIME_WAIT&#xff0c;SO_REUSEPORT \u652f\u6301\u591a\u8fdb\u7a0b\u76d1\u542c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">RAII<\/td>\n<td align=\"left\">\u6790\u6784\u81ea\u52a8\u5173\u95ed fd&#xff0c;\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">SIGPIPE<\/td>\n<td align=\"left\">\u9700\u5ffd\u7565&#xff0c;\u9632\u6b62\u5411\u5df2\u5173\u95ed\u8fde\u63a5\u53d1\u9001\u6570\u636e\u5bfc\u81f4\u8fdb\u7a0b\u9000\u51fa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>6. \u4f7f\u7528\u793a\u4f8b<\/h3>\n<h4>6.1 \u670d\u52a1\u7aef<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;server.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Socket lst_sock<span class=\"token punctuation\">;<\/span><br \/>\n    lst_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreaterServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8500<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9ed8\u8ba4\u963b\u585e<\/span><br \/>\n    <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        <span class=\"token keyword\">int<\/span> newfd <span class=\"token operator\">&#061;<\/span> lst_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>newfd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        Socket <span class=\"token function\">cli_sock<\/span><span class=\"token punctuation\">(<\/span>newfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <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 operator\">&#061;<\/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 keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Recv<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1023<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/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><br \/>\n        cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Send<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    lst_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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<h4>6.2 \u5ba2\u6237\u7aef<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;server.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Socket cli_sock<span class=\"token punctuation\">;<\/span><br \/>\n    cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8500<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Send<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/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\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cli_sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">Recv<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1023<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">DBG_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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<hr \/>\n<h3>7. \u603b\u7ed3<\/h3>\n<p>Socket \u7c7b\u662f\u5bf9 Linux \u539f\u751f socket API \u7684\u8f7b\u91cf\u7ea7\u5c01\u88c5&#xff0c;\u6838\u5fc3\u63a5\u53e3&#xff1a;<\/p>\n<ul>\n<li>\u521b\u5efa&#xff1a;Create<\/li>\n<li>\u7ed1\u5b9a&#xff1a;Bind<\/li>\n<li>\u76d1\u542c&#xff1a;Listen<\/li>\n<li>\u8fde\u63a5&#xff1a;Connect<\/li>\n<li>\u63a5\u53d7&#xff1a;Accept<\/li>\n<li>\u6536\u53d1&#xff1a;Recv \/ Send&#xff0c;\u652f\u6301\u975e\u963b\u585e\u7248\u672c<\/li>\n<li>\u5173\u95ed&#xff1a;Close<\/li>\n<li>\u8f85\u52a9&#xff1a;ReuseAddress\u3001NonBlock<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content<\/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":[55,58,43],"topic":[],"class_list":["post-117739","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>C++ \u4effmuduo\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\uff1aSocket\u6a21\u5757 - \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\/117739.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ 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