{"id":75782,"date":"2026-02-13T07:43:22","date_gmt":"2026-02-12T23:43:22","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/75782.html"},"modified":"2026-02-13T07:43:22","modified_gmt":"2026-02-12T23:43:22","slug":"c%e8%af%ad%e8%a8%80%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e5%85%a5%e9%97%a8%ef%bc%9asocket%e7%bc%96%e7%a8%8b%e3%80%81tcp-ip%e5%8d%8f%e8%ae%ae%e3%80%81%e5%ae%a2%e6%88%b7%e7%ab%af%e4%b8%8e%e6%9c%8d","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/75782.html","title":{"rendered":"C\u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u5165\u95e8\uff1asocket\u7f16\u7a0b\u3001TCP\/IP\u534f\u8bae\u3001\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0"},"content":{"rendered":"<h2>\u7b2c11\u7bc7 \u300aC\u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u5165\u95e8&#xff1a;socket\u7f16\u7a0b\u3001TCP\/IP\u534f\u8bae\u3001\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0\u300b<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260212234320-698e6598c2bff.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u4e00\u3001\u524d\u8a00&#xff1a;\u4e3a\u4ec0\u4e48\u7f51\u7edc\u7f16\u7a0b\u662fC\u8bed\u8a00\u5f00\u53d1\u7684\u91cd\u8981\u65b9\u5411&#xff1f;<\/h3>\n<h4>\u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3\u7f51\u7edc\u7f16\u7a0b\u7684\u672c\u8d28&#xff1a;\u901a\u8fc7\u7f51\u7edc\u5b9e\u73b0\u7a0b\u5e8f\u4e4b\u95f4\u7684\u901a\u4fe1<\/li>\n<li>\u7406\u89e3TCP\/IP\u534f\u8bae\u7684\u57fa\u672c\u6982\u5ff5&#xff1a;\u4f20\u8f93\u5c42\u548c\u7f51\u7edc\u5c42\u7684\u534f\u8bae<\/li>\n<li>\u660e\u786e\u7f51\u7edc\u7f16\u7a0b\u7684\u91cd\u8981\u6027&#xff1a;\u5b9e\u73b0\u7a0b\u5e8f\u7684\u8fdc\u7a0b\u901a\u4fe1\u3001\u5904\u7406\u5927\u91cf\u6570\u636e<\/li>\n<li>\u638c\u63e1\u672c\u7ae0\u5b66\u4e60\u91cd\u70b9&#xff1a;socket\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5\u3001TCP\/IP\u534f\u8bae\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0\u3001\u7f51\u7edc\u7f16\u7a0b\u7684\u907f\u5751\u6307\u5357\u3001\u5b9e\u6218\u6848\u4f8b\u5206\u6790<\/li>\n<li>\u5b66\u4f1a\u4f7f\u7528socket\u7f16\u7a0b\u7f16\u5199\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u7a0b\u5e8f<\/li>\n<\/ul>\n<h4>\u91cd\u70b9\u63d0\u793a<\/h4>\n<p>&#x1f4a1; \u7f51\u7edc\u7f16\u7a0b\u662fC\u8bed\u8a00\u5f00\u53d1\u7684\u91cd\u8981\u65b9\u5411&#xff01;\u901a\u8fc7\u7f51\u7edc\u7f16\u7a0b&#xff0c;\u4f60\u53ef\u4ee5\u5b9e\u73b0\u7a0b\u5e8f\u7684\u8fdc\u7a0b\u901a\u4fe1&#xff0c;\u5904\u7406\u5927\u91cf\u6570\u636e&#xff0c;\u89e3\u51b3\u590d\u6742\u95ee\u9898\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u6a21\u57571&#xff1a;socket\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5\u2014\u2014\u7f51\u7edc\u901a\u4fe1\u7684\u57fa\u7840<\/h3>\n<h4>2.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3socket\u7684\u672c\u8d28&#xff1a;\u7f51\u7edc\u901a\u4fe1\u7684\u63a5\u53e3<\/li>\n<li>\u638c\u63e1socket\u7684\u7c7b\u578b&#xff1a;\u6d41\u5957\u63a5\u5b57&#xff08;SOCK_STREAM&#xff09;\u3001\u6570\u636e\u62a5\u5957\u63a5\u5b57&#xff08;SOCK_DGRAM&#xff09;<\/li>\n<li>\u638c\u63e1socket\u7684\u521b\u5efa\u65b9\u6cd5&#xff1a;\u4f7f\u7528socket\u51fd\u6570\u521b\u5efa\u5957\u63a5\u5b57<\/li>\n<li>\u907f\u5f00socket\u7f16\u7a0b\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>2.2 socket\u7684\u7c7b\u578b<\/h4>\n<p>\u6d41\u5957\u63a5\u5b57&#xff08;SOCK_STREAM&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u57fa\u4e8eTCP\u534f\u8bae<\/li>\n<li>\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1<\/li>\n<li>\u4fdd\u8bc1\u6570\u636e\u7684\u987a\u5e8f\u548c\u5b8c\u6574\u6027<\/li>\n<\/ul>\n<p>\u6570\u636e\u62a5\u5957\u63a5\u5b57&#xff08;SOCK_DGRAM&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u57fa\u4e8eUDP\u534f\u8bae<\/li>\n<li>\u4e0d\u53ef\u9760\u7684\u3001\u65e0\u8fde\u63a5\u7684\u901a\u4fe1<\/li>\n<li>\u4e0d\u4fdd\u8bc1\u6570\u636e\u7684\u987a\u5e8f\u548c\u5b8c\u6574\u6027<\/li>\n<\/ul>\n<p>\u4ee3\u7801\u793a\u4f8b1&#xff1a;\u521b\u5efasocket<\/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;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;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;arpa\/inet.h&gt;<\/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    <span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> server_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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> <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>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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/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><br \/>\n    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_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><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">)<\/span><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><span class=\"token number\">12345<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8fde\u63a5\u670d\u52a1\u5668<\/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>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>server_addr<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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<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 string\">&#034;Hello, Server!&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>sockfd<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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv() error&#034;<\/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<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u8fd4\u56de&#xff1a;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5173\u95edsocket<\/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><\/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<hr \/>\n<h3>\u4e09\u3001\u6a21\u57572&#xff1a;TCP\/IP\u534f\u8bae\u7684\u57fa\u672c\u6982\u5ff5\u2014\u2014\u7f51\u7edc\u901a\u4fe1\u7684\u6838\u5fc3<\/h3>\n<h4>3.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3TCP\u7684\u672c\u8d28&#xff1a;\u4f20\u8f93\u5c42\u7684\u534f\u8bae&#xff0c;\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1<\/li>\n<li>\u7406\u89e3IP\u7684\u672c\u8d28&#xff1a;\u7f51\u7edc\u5c42\u7684\u534f\u8bae&#xff0c;\u8d1f\u8d23\u6570\u636e\u7684\u8def\u7531\u548c\u5bfb\u5740<\/li>\n<li>\u638c\u63e1TCP\/IP\u534f\u8bae\u7684\u5206\u5c42\u7ed3\u6784&#xff1a;\u5e94\u7528\u5c42\u3001\u4f20\u8f93\u5c42\u3001\u7f51\u7edc\u5c42\u3001\u6570\u636e\u94fe\u8def\u5c42<\/li>\n<li>\u907f\u5f00TCP\/IP\u534f\u8bae\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>3.2 TCP\/IP\u534f\u8bae\u7684\u5206\u5c42\u7ed3\u6784<\/h4>\n<p>\u5e94\u7528\u5c42&#xff1a;\u5904\u7406\u5e94\u7528\u7a0b\u5e8f\u7684\u8bf7\u6c42\u548c\u54cd\u5e94&#xff0c;\u5982HTTP\u3001FTP\u3001SMTP<br \/>\n\u4f20\u8f93\u5c42&#xff1a;\u8d1f\u8d23\u6570\u636e\u7684\u4f20\u8f93&#xff0c;\u5982TCP\u3001UDP<br \/>\n\u7f51\u7edc\u5c42&#xff1a;\u8d1f\u8d23\u6570\u636e\u7684\u8def\u7531\u548c\u5bfb\u5740&#xff0c;\u5982IP\u3001ICMP<br \/>\n\u6570\u636e\u94fe\u8def\u5c42&#xff1a;\u8d1f\u8d23\u6570\u636e\u7684\u7269\u7406\u4f20\u8f93&#xff0c;\u5982Ethernet\u3001WiFi<\/p>\n<hr \/>\n<h3>\u56db\u3001\u6a21\u57573&#xff1a;\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0\u2014\u2014\u6d41\u5957\u63a5\u5b57\u901a\u4fe1<\/h3>\n<h4>4.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3\u6d41\u5957\u63a5\u5b57\u901a\u4fe1\u7684\u672c\u8d28&#xff1a;\u57fa\u4e8eTCP\u534f\u8bae\u7684\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1<\/li>\n<li>\u638c\u63e1\u670d\u52a1\u5668\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5&#xff1a;\u521b\u5efasocket\u3001\u7ed1\u5b9a\u5730\u5740\u3001\u76d1\u542c\u8fde\u63a5\u3001\u63a5\u53d7\u8fde\u63a5\u3001\u53d1\u9001\u6570\u636e\u3001\u63a5\u6536\u6570\u636e\u3001\u5173\u95edsocket<\/li>\n<li>\u638c\u63e1\u5ba2\u6237\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5&#xff1a;\u521b\u5efasocket\u3001\u8fde\u63a5\u670d\u52a1\u5668\u3001\u53d1\u9001\u6570\u636e\u3001\u63a5\u6536\u6570\u636e\u3001\u5173\u95edsocket<\/li>\n<li>\u907f\u5f00\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>4.2 \u670d\u52a1\u5668\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5<\/h4>\n<p>\u4ee3\u7801\u793a\u4f8b2&#xff1a;\u670d\u52a1\u5668\u7aef\u7a0b\u5e8f<\/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;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;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;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;unistd.h&gt;<\/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    <span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> newsockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">socklen_t<\/span> clilen<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<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\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serv_addr<span class=\"token punctuation\">,<\/span> cli_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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> <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>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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>serv_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>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><br \/>\n    serv_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><span class=\"token number\">12345<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u5730\u5740<\/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>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>serv_addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u76d1\u542c\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    newsockfd <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 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>cli_addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>clilen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>newsockfd <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept() error&#034;<\/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><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef\u8fde\u63a5\u6210\u529f&#xff01;\u5730\u5740&#xff1a;%s&#xff0c;\u7aef\u53e3&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>buffer<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>buffer<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><span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>newsockfd<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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv() error&#034;<\/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><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef\u53d1\u9001&#xff1a;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span><br \/>\n    <span class=\"token function\">strcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Hello, Client!&#034;<\/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\">send<\/span><span class=\"token punctuation\">(<\/span>newsockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u5173\u95edsocket<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>newsockfd<span class=\"token punctuation\">)<\/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><\/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<hr \/>\n<h3>\u4e94\u3001\u6a21\u57574&#xff1a;\u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u7684\u5b9e\u73b0\u2014\u2014\u57fa\u4e8eUDP\u534f\u8bae\u7684\u901a\u4fe1<\/h3>\n<h4>5.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3\u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u7684\u672c\u8d28&#xff1a;\u57fa\u4e8eUDP\u534f\u8bae\u7684\u4e0d\u53ef\u9760\u7684\u3001\u65e0\u8fde\u63a5\u7684\u901a\u4fe1<\/li>\n<li>\u638c\u63e1\u670d\u52a1\u5668\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5&#xff1a;\u521b\u5efasocket\u3001\u7ed1\u5b9a\u5730\u5740\u3001\u63a5\u6536\u6570\u636e\u3001\u53d1\u9001\u6570\u636e\u3001\u5173\u95edsocket<\/li>\n<li>\u638c\u63e1\u5ba2\u6237\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5&#xff1a;\u521b\u5efasocket\u3001\u53d1\u9001\u6570\u636e\u3001\u63a5\u6536\u6570\u636e\u3001\u5173\u95edsocket<\/li>\n<li>\u907f\u5f00\u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>5.2 \u670d\u52a1\u5668\u7aef\u7684\u5b9e\u73b0\u65b9\u6cd5<\/h4>\n<p>\u4ee3\u7801\u793a\u4f8b3&#xff1a;UDP\u670d\u52a1\u5668\u7aef\u7a0b\u5e8f<\/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;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;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;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;unistd.h&gt;<\/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    <span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">socklen_t<\/span> clilen<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<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\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serv_addr<span class=\"token punctuation\">,<\/span> cli_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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_DGRAM<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\">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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>serv_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>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><br \/>\n    serv_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><span class=\"token number\">12345<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u5730\u5740<\/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>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>serv_addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n    clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>buffer<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>buffer<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><span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>sockfd<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><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>cli_addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>clilen<span class=\"token punctuation\">)<\/span> <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recvfrom() error&#034;<\/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><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef\u53d1\u9001&#xff1a;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span><br \/>\n    <span class=\"token function\">strcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Hello, Client!&#034;<\/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\">sendto<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/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><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>cli_addr<span class=\"token punctuation\">,<\/span> clilen<span class=\"token punctuation\">)<\/span> <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;sendto() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u5173\u95edsocket<\/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><\/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<hr \/>\n<h3>\u516d\u3001\u6a21\u57575&#xff1a;\u7f51\u7edc\u7f16\u7a0b\u7684\u907f\u5751\u6307\u5357\u2014\u2014\u907f\u514d\u5e38\u89c1\u95ee\u9898<\/h3>\n<h4>6.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u7406\u89e3\u7f51\u7edc\u7f16\u7a0b\u7684\u5e38\u89c1\u95ee\u9898&#xff1a;\u8bed\u6cd5\u9519\u8bef\u3001\u903b\u8f91\u9519\u8bef\u3001\u8fde\u63a5\u5931\u8d25\u3001\u53d1\u9001\u5931\u8d25\u3001\u63a5\u6536\u5931\u8d25\u3001\u5185\u5b58\u6cc4\u6f0f<\/li>\n<li>\u638c\u63e1\u907f\u514d\u8bed\u6cd5\u9519\u8bef\u7684\u65b9\u6cd5&#xff1a;\u4f7f\u7528\u7f16\u8bd1\u5668\u68c0\u67e5\u4ee3\u7801<\/li>\n<li>\u638c\u63e1\u907f\u514d\u903b\u8f91\u9519\u8bef\u7684\u65b9\u6cd5&#xff1a;\u4f7f\u7528\u8c03\u8bd5\u5de5\u5177\u5b9a\u4f4d\u548c\u4fee\u590d\u95ee\u9898<\/li>\n<li>\u638c\u63e1\u907f\u514d\u8fde\u63a5\u5931\u8d25\u7684\u65b9\u6cd5&#xff1a;\u68c0\u67e5\u670d\u52a1\u5668\u5730\u5740\u548c\u7aef\u53e3\u662f\u5426\u6b63\u786e\u3001\u68c0\u67e5\u9632\u706b\u5899\u662f\u5426\u5f00\u542f<\/li>\n<li>\u638c\u63e1\u907f\u514d\u53d1\u9001\u5931\u8d25\u7684\u65b9\u6cd5&#xff1a;\u68c0\u67e5socket\u662f\u5426\u6709\u6548\u3001\u68c0\u67e5\u53d1\u9001\u7684\u6570\u636e\u662f\u5426\u4e3a\u7a7a<\/li>\n<li>\u638c\u63e1\u907f\u514d\u63a5\u6536\u5931\u8d25\u7684\u65b9\u6cd5&#xff1a;\u68c0\u67e5socket\u662f\u5426\u6709\u6548\u3001\u68c0\u67e5\u63a5\u6536\u7684\u6570\u636e\u662f\u5426\u4e3a\u7a7a<\/li>\n<li>\u638c\u63e1\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u7684\u65b9\u6cd5&#xff1a;\u5728\u4f7f\u7528\u5b8c\u5185\u5b58\u540e&#xff0c;\u4f7f\u7528free()\u51fd\u6570\u91ca\u653e\u5185\u5b58<\/li>\n<li>\u907f\u5f00\u7f51\u7edc\u7f16\u7a0b\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>6.2 \u5e38\u89c1\u95ee\u9898<\/h4>\n<h5>6.2.1 \u8fde\u63a5\u5931\u8d25<\/h5>\n<p>\u95ee\u9898&#xff1a;\u65e0\u6cd5\u8fde\u63a5\u5230\u670d\u52a1\u5668&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>\u68c0\u67e5\u670d\u52a1\u5668\u5730\u5740\u548c\u7aef\u53e3\u662f\u5426\u6b63\u786e<\/li>\n<li>\u68c0\u67e5\u670d\u52a1\u5668\u662f\u5426\u6b63\u5728\u8fd0\u884c<\/li>\n<li>\u68c0\u67e5\u9632\u706b\u5899\u662f\u5426\u5f00\u542f<\/li>\n<li>\u4f7f\u7528telnet\u547d\u4ee4\u6d4b\u8bd5\u670d\u52a1\u5668\u662f\u5426\u53ef\u8fde\u63a5<\/li>\n<\/ul>\n<h5>6.2.2 \u53d1\u9001\u5931\u8d25<\/h5>\n<p>\u95ee\u9898&#xff1a;\u65e0\u6cd5\u53d1\u9001\u6570\u636e\u5230\u670d\u52a1\u5668&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>\u68c0\u67e5socket\u662f\u5426\u6709\u6548<\/li>\n<li>\u68c0\u67e5\u53d1\u9001\u7684\u6570\u636e\u662f\u5426\u4e3a\u7a7a<\/li>\n<li>\u68c0\u67e5\u7f51\u7edc\u8fde\u63a5\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u4f7f\u7528\u8c03\u8bd5\u5de5\u5177\u5b9a\u4f4d\u548c\u4fee\u590d\u95ee\u9898<\/li>\n<\/ul>\n<h5>6.2.3 \u63a5\u6536\u5931\u8d25<\/h5>\n<p>\u95ee\u9898&#xff1a;\u65e0\u6cd5\u63a5\u6536\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>\u68c0\u67e5socket\u662f\u5426\u6709\u6548<\/li>\n<li>\u68c0\u67e5\u63a5\u6536\u7684\u6570\u636e\u662f\u5426\u4e3a\u7a7a<\/li>\n<li>\u68c0\u67e5\u7f51\u7edc\u8fde\u63a5\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u4f7f\u7528\u8c03\u8bd5\u5de5\u5177\u5b9a\u4f4d\u548c\u4fee\u590d\u95ee\u9898<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e03\u3001\u6a21\u57576&#xff1a;\u5b9e\u6218\u6848\u4f8b\u5206\u6790\u2014\u2014\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u804a\u5929\u7a0b\u5e8f<\/h3>\n<h4>7.1 \u5b66\u4e60\u76ee\u6807<\/h4>\n<ul>\n<li>\u638c\u63e1\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u804a\u5929\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u6d41\u5957\u63a5\u5b57\u901a\u4fe1\u5b9e\u73b0\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u7684\u804a\u5929\u529f\u80fd<\/li>\n<li>\u5b66\u4f1a\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u89e3\u51b3\u5b9e\u9645\u95ee\u9898<\/li>\n<li>\u907f\u5f00\u5b9e\u6218\u6848\u4f8b\u4f7f\u7528\u76843\u5927\u5e38\u89c1\u5751<\/li>\n<\/ul>\n<h4>7.2 \u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u804a\u5929\u7a0b\u5e8f<\/h4>\n<p>\u4ee3\u7801\u793a\u4f8b4&#xff1a;\u670d\u52a1\u5668\u7aef\u7a0b\u5e8f<\/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;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;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;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;unistd.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><\/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\">MAX_CLIENTS<\/span> <span class=\"token expression\"><span class=\"token number\">5<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Client<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sockfd<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 keyword\">struct<\/span> <span class=\"token class-name\">Client<\/span> clients<span class=\"token punctuation\">[<\/span>MAX_CLIENTS<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> num_clients <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">pthread_mutex_t<\/span> mutex <span class=\"token operator\">&#061;<\/span> PTHREAD_MUTEX_INITIALIZER<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">handle_client<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>arg<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Client<\/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\">Client<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<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> read_size<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>read_size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>sockfd<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> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        buffer<span class=\"token punctuation\">[<\/span>read_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef %s:%d \u53d1\u9001&#xff1a;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e7f\u64ad\u6d88\u606f\u7ed9\u6240\u6709\u5ba2\u6237\u7aef<\/span><br \/>\n        <span class=\"token function\">pthread_mutex_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> num_clients<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>clients<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>sockfd <span class=\"token operator\">!&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>sockfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>clients<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/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><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">pthread_mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef %s:%d \u65ad\u5f00\u8fde\u63a5\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">pthread_mutex_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> num_clients<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>clients<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>sockfd <span class=\"token operator\">&#061;&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span>sockfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> num_clients <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                clients<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> clients<span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            num_clients<span class=\"token operator\">&#8212;<\/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><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">pthread_mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token operator\">-&gt;<\/span>sockfd<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 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 punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> newsockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">socklen_t<\/span> clilen<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serv_addr<span class=\"token punctuation\">,<\/span> cli_addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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> <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>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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>serv_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>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serv_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><br \/>\n    serv_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><span class=\"token number\">12345<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u5730\u5740<\/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>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>serv_addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serv_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u76d1\u542c\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cli_addr<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;\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><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        <span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5<\/span><br \/>\n        newsockfd <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 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>cli_addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>clilen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>newsockfd <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept() error&#034;<\/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<p>        <span class=\"token comment\">\/\/ \u6dfb\u52a0\u5ba2\u6237\u7aef\u5230\u5ba2\u6237\u7aef\u5217\u8868<\/span><br \/>\n        <span class=\"token function\">pthread_mutex_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>num_clients <span class=\"token operator\">&gt;&#061;<\/span> MAX_CLIENTS<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;\u5ba2\u6237\u7aef\u6570\u91cf\u5df2\u8fbe\u5230\u4e0a\u9650&#xff01;\\\\n&#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>newsockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">pthread_mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<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 keyword\">struct<\/span> <span class=\"token class-name\">Client<\/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\">Client<\/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\">Client<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        client<span class=\"token operator\">-&gt;<\/span>sockfd <span class=\"token operator\">&#061;<\/span> newsockfd<span class=\"token punctuation\">;<\/span><br \/>\n        client<span class=\"token operator\">-&gt;<\/span>addr <span class=\"token operator\">&#061;<\/span> cli_addr<span class=\"token punctuation\">;<\/span><br \/>\n        clients<span class=\"token punctuation\">[<\/span>num_clients<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>client<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pthread_mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<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;\u5ba2\u6237\u7aef %s:%d \u8fde\u63a5\u6210\u529f&#xff01;\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cli_addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b\u5904\u7406\u5ba2\u6237\u7aef<\/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> handle_client<span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pthread_detach<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5173\u95edsocket<\/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><\/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>\u4ee3\u7801\u793a\u4f8b5&#xff1a;\u5ba2\u6237\u7aef\u7a0b\u5e8f<\/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;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;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;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;unistd.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><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">receive_messages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>arg<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<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> read_size<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>read_size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>sockfd<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> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        buffer<span class=\"token punctuation\">[<\/span>read_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6536\u5230\u6d88\u606f&#xff1a;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">)<\/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>read_size <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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u65ad\u5f00\u8fde\u63a5&#xff01;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>read_size <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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv() error&#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 function\">close<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/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>    <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 punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">;<\/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 keyword\">char<\/span> buffer<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 class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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> <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>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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket() error&#034;<\/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<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/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><br \/>\n    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_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><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">)<\/span><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><span class=\"token number\">12345<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8fde\u63a5\u670d\u52a1\u5668<\/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>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>server_addr<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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect() error&#034;<\/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<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fde\u63a5\u670d\u52a1\u5668\u6210\u529f&#xff01;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b\u63a5\u6536\u6d88\u606f<\/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> receive_messages<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6d88\u606f<\/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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u6d88\u606f&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">fgets<\/span><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 constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        buffer<span class=\"token punctuation\">[<\/span><span class=\"token function\">strcspn<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/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 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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send() error&#034;<\/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<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">strcmp<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;exit&#034;<\/span><span class=\"token punctuation\">)<\/span> <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 function\">close<\/span><span class=\"token punctuation\">(<\/span>sockfd<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><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<hr \/>\n<h3>\u516b\u3001\u672c\u7ae0\u603b\u7ed3\u4e0e\u8bfe\u540e\u7ec3\u4e60<\/h3>\n<h4>8.1 \u603b\u7ed3<\/h4>\n<p>\u2705 socket\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5&#xff1a;\u7f51\u7edc\u901a\u4fe1\u7684\u63a5\u53e3&#xff0c;\u5206\u4e3a\u6d41\u5957\u63a5\u5b57\u548c\u6570\u636e\u62a5\u5957\u63a5\u5b57<br \/>\n\u2705 TCP\/IP\u534f\u8bae\u7684\u57fa\u672c\u6982\u5ff5&#xff1a;\u7f51\u7edc\u901a\u4fe1\u7684\u6838\u5fc3&#xff0c;\u5206\u4e3a\u5e94\u7528\u5c42\u3001\u4f20\u8f93\u5c42\u3001\u7f51\u7edc\u5c42\u3001\u6570\u636e\u94fe\u8def\u5c42<br \/>\n\u2705 \u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0&#xff1a;\u4f7f\u7528\u6d41\u5957\u63a5\u5b57\u901a\u4fe1\u5b9e\u73b0\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1<br \/>\n\u2705 \u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u7684\u5b9e\u73b0&#xff1a;\u4f7f\u7528\u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u5b9e\u73b0\u4e0d\u53ef\u9760\u7684\u3001\u65e0\u8fde\u63a5\u7684\u901a\u4fe1<br \/>\n\u2705 \u7f51\u7edc\u7f16\u7a0b\u7684\u907f\u5751\u6307\u5357&#xff1a;\u907f\u514d\u8bed\u6cd5\u9519\u8bef\u3001\u903b\u8f91\u9519\u8bef\u3001\u8fde\u63a5\u5931\u8d25\u3001\u53d1\u9001\u5931\u8d25\u3001\u63a5\u6536\u5931\u8d25\u3001\u5185\u5b58\u6cc4\u6f0f<br \/>\n\u2705 \u5b9e\u6218\u6848\u4f8b\u5206\u6790&#xff1a;\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u804a\u5929\u7a0b\u5e8f&#xff0c;\u652f\u6301\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8fde\u63a5<\/p>\n<h4>8.2 \u8bfe\u540e\u7ec3\u4e60<\/h4>\n<li>\u7f16\u5199\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u6570\u636e\u62a5\u5957\u63a5\u5b57\u901a\u4fe1\u5b9e\u73b0\u7b80\u5355\u7684\u7f51\u7edc\u804a\u5929\u7a0b\u5e8f<\/li>\n<li>\u7f16\u5199\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u6d41\u5957\u63a5\u5b57\u901a\u4fe1\u5b9e\u73b0\u6587\u4ef6\u4f20\u8f93\u529f\u80fd<\/li>\n<li>\u7f16\u5199\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u7b80\u5355\u7684HTTP\u670d\u52a1\u5668<\/li>\n<li>\u7f16\u5199\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u7b80\u5355\u7684FTP\u5ba2\u6237\u7aef<\/li>\n<li>\u7f16\u5199\u7a0b\u5e8f&#xff1a;\u4f7f\u7528\u7f51\u7edc\u7f16\u7a0b\u5b9e\u73b0\u7b80\u5355\u7684SMTP\u5ba2\u6237\u7aef<\/li>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c11\u7bc7 \u300aC\u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u5165\u95e8&#xff1a;socket\u7f16\u7a0b\u3001TCP\/IP\u534f\u8bae\u3001\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5b9e\u73b0\u300b\u4e00\u3001\u524d\u8a00&#xff1a;\u4e3a\u4ec0\u4e48\u7f51\u7edc\u7f16\u7a0b\u662fC\u8bed\u8a00\u5f00\u53d1\u7684\u91cd\u8981\u65b9\u5411&#xff1f;<br \/>\n\u5b66\u4e60\u76ee\u6807<br 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