{"id":25624,"date":"2025-04-19T13:16:36","date_gmt":"2025-04-19T05:16:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/25624.html"},"modified":"2025-04-19T13:16:36","modified_gmt":"2025-04-19T05:16:36","slug":"linux-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e5%9f%ba%e7%a1%80%ef%bc%9a%e6%9e%84%e5%bb%ba%e4%bd%a0%e7%9a%84%e7%ac%ac%e4%b8%80%e4%b8%aa-tcp-%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/25624.html","title":{"rendered":"Linux \u7f51\u7edc\u7f16\u7a0b\u57fa\u7840\uff1a\u6784\u5efa\u4f60\u7684\u7b2c\u4e00\u4e2a TCP \u670d\u52a1\u5668"},"content":{"rendered":"<\/p>\n<h4>Linux\u7f51\u7edc\u7f16\u7a0b\u57fa\u7840\u4ee5\u53ca\u7b2c\u4e00\u4e2aTCP\u670d\u52a1\u5668<\/h4>\n<ul>\n<li>\u4e00\u3001\u4ec0\u4e48\u662f IO &#xff1f;<\/li>\n<li>\u4e8c\u3001\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>2.1\u3001socket() \u51fd\u6570<\/li>\n<li>2.2\u3001bind() \u51fd\u6570<\/li>\n<li>2.3\u3001listen() \u51fd\u6570<\/li>\n<li>2.4\u3001accept() \u51fd\u6570<\/li>\n<li>2.5\u3001fcntl() \u51fd\u6570<\/li>\n<li>2.6\u3001connect() \u51fd\u6570<\/li>\n<li>2.7\u3001send() \u51fd\u6570<\/li>\n<li>2.8\u3001recv() \u51fd\u6570<\/li>\n<li>2.9\u3001close() \u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u963b\u585e\u548c\u975e\u963b\u585e\u7684\u533a\u522b<\/li>\n<li>\u56db\u3001\u5982\u4f55\u5f00\u53d1\u4e00\u4e2aTCP\u670d\u52a1\u5668&#xff1f;<\/li>\n<li>\u4e94\u3001\u603b\u7ed3<\/li>\n<\/ul>\n<h2>\u4e00\u3001\u4ec0\u4e48\u662f IO &#xff1f;<\/h2>\n<p>IO \u662f input\/output\u7684\u7b80\u5199&#xff0c;\u5373\u8f93\u5165\u8f93\u51fa\u3002\u5728\u64cd\u4f5c\u7cfb\u7edf\u4ee5\u4e0a\u7684\u8f6f\u4ef6\u5c42\u9762&#xff0c;\u7279\u522b\u662f\u5728Linux\u4e0a\u7684 IO \u90fd\u53ef\u4ee5\u89c6\u4e3a fd &#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff09;&#xff0c;\u7f51\u7edc IO \u4e5f\u53ef\u4ee5\u89c6\u4e3a socket\u3002<\/p>\n<p>\u4e0b\u56fe\u662fTCP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u7684\u4ea4\u4e92\u793a\u610f\u56fe&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419051635-680331b3436d9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>TCP\u670d\u52a1\u4f1a\u76d1\u542c\u4e00\u4e2a\u7aef\u53e3&#xff0c;\u5ba2\u6237\u7aef\u8fde\u63a5\u5230\u7aef\u53e3\u65f6\u670d\u52a1\u5668\u4f1a\u4e3a\u5176\u751f\u6210\u5bf9\u5e94\u7684 listen fd&#xff08;\u6bcf\u4e00\u4e2aTCP\u8fde\u63a5\u90fd\u4f1a\u5728\u670d\u52a1\u5668\u751f\u6210\u76f8\u5e94\u7684socket&#xff09;\u3002<\/p>\n<p>\u53ea\u8981\u80fd\u6784\u5efa\u51fa\u8f93\u5165\u548c\u8f93\u51fa&#xff0c;\u5728\u53e3\u8bed\u8868\u8ff0\u7684\u65f6\u5019\u90fd\u53ef\u4ee5\u79f0\u4e3aIO\u3002<\/p>\n<p>\u7f51\u7edc IO \u7f16\u7a0b\u4e3b\u8981\u56f4\u7ed5\u4e24\u4e2a\u6838\u5fc3&#xff1a;<\/p>\n<li>\u963b\u585e\u3001\u975e\u963b\u585e&#xff0c;\u5f02\u6b65\u3001\u540c\u6b65\u3002<\/li>\n<li>IO\u591a\u8def\u590d\u7528\u3002<\/li>\n<h2>\u4e8c\u3001\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3\u51fd\u6570<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u8981\u5b9e\u73b0\u4e00\u4e2a TCP \u670d\u52a1\u5668&#xff0c;\u6211\u4eec\u5c31\u8981\u5148\u4e86\u89e3\u6709\u54ea\u4e9b\u63a5\u53e3\u53ef\u4ee5\u4f7f\u7528\u3002\u5728Linux\u4e2d&#xff0c;\u4f7f\u7528C&#043;&#043;\u8fdb\u884c\u7f51\u7edc\u7f16\u7a0b\u901a\u5e38\u6d89\u53ca\u51e0\u4e2a\u57fa\u672c\u7684socket\u51fd\u6570\u3002<\/p>\n<p>\u90a3\u4e48\u4ec0\u4e48\u662f socket \u5462&#xff1f;<\/p>\n<p>socket \u76f4\u63a5\u7ffb\u8bd1\u8fc7\u6765\u53eb\u505a \u201c\u63d2\u5ea7\u201d&#xff0c;\u5f88\u96be\u4e0e IO \u8054\u60f3\u5230\u4e00\u8d77\u3002\u63d2\u5ea7\u4e00\u822c\u5206\u4e3a\u4e24\u4e2a\u90e8\u5206&#xff0c;\u5373\u63d2\u5934\u548c\u5ea7\u6392&#xff1b;socket\u4e5f\u540c\u6837\u5982\u6b64&#xff0c;\u5e26\u6709\u4e24\u5c42\u5c5e\u6027&#xff1a;<\/p>\n<li>fd&#xff0c;\u5373\u5b83\u662f\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u53ef\u4ee5\u901a\u8fc7open\u3001read\u3001write\u53bb\u64cd\u4f5c\u5b83\u3002<\/li>\n<li>\u540c\u6837\u4e5f\u5177\u5907\u7f51\u7edc\u7684\u5c5e\u6027&#xff0c;\u662f\u7f51\u7edc\u901a\u4fe1\u7684\u4e00\u4e2a TCB \u63a7\u5236\u5757\u3002<\/li>\n<p>\u8fd9\u4e24\u4e2a\u662f\u8054\u7cfb\u5728\u4e00\u8d77\u7684&#xff0c;\u5f53\u6211\u4eec\u8c03\u7528write\u6216read\u8fd9\u4e2a\u51fd\u6570\u7684\u65f6\u5019&#xff0c;\u5b83\u901a\u8fc7 fd \u67e5\u627e\u5230\u5bf9\u5e94\u7684\u6536\u53d1\u7f51\u7edc\u63a7\u5236\u5757&#xff0c;\u7136\u540e\u628a\u6570\u636e\u653e\u5230\u91cc\u9762\u53bb\u3002<\/p>\n<h3>2.1\u3001socket() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/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;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> domain<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> type<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> protocol<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<table>\n<tr>\u53c2\u6570\u63cf\u8ff0\u53d6\u503c\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">domain<\/td>\n<td>\u6307\u5b9a\u534f\u8bae\u65cf&#xff08;\u5730\u5740\u65cf&#xff09;&#xff0c;\u51b3\u5b9a\u4f7f\u7528\u54ea\u79cd\u7f51\u7edc\u534f\u8bae\u3002<\/td>\n<td align=\"left\">AF_INET &#xff08;IPv4&#xff09;  AF_INET6 &#xff08;IPv6&#xff09;  AF_UNIX &#xff08;\u672c\u5730\u901a\u4fe1&#xff09;  AF_PACKET &#xff08;\u94fe\u8def\u5c42&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">type<\/td>\n<td>\u6307\u5b9a\u5957\u63a5\u5b57\u7c7b\u578b&#xff0c;\u51b3\u5b9a\u5957\u63a5\u5b57\u7684\u4f20\u8f93\u534f\u8bae\u7c7b\u578b\u3002<\/td>\n<td align=\"left\">SOCK_STREAM &#xff08;TCP&#xff0c;\u9762\u5411\u8fde\u63a5&#xff09;  SOCK_DGRAM &#xff08;UDP&#xff0c;\u65e0\u8fde\u63a5&#xff09;  SOCK_RAW &#xff08;\u539f\u59cb\u5957\u63a5\u5b57&#xff09;  SOCK_SEQPACKET &#xff08;\u9762\u5411\u6d88\u606f\u7684\u53ef\u9760\u8fde\u63a5&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">protocol<\/td>\n<td>\u6307\u5b9a\u5177\u4f53\u7684\u4f20\u8f93\u534f\u8bae&#xff0c;\u901a\u5e38\u8bbe\u4e3a0\u4ee5\u9009\u62e9\u9ed8\u8ba4\u534f\u8bae\u3002<\/td>\n<td align=\"left\">IPPROTO_TCP &#xff08;\u7528\u4e8e TCP&#xff09;  IPPROTO_UDP &#xff08;\u7528\u4e8e UDP&#xff09;  0 &#xff08;\u4f7f\u7528\u9ed8\u8ba4&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u4e00\u4e2a\u975e\u8d1f\u6574\u6570&#xff08;socket\u63cf\u8ff0\u7b26&#xff09;&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de -1\u3002<\/p>\n<p>socket()\u51fd\u6570\u4e3a\u4ec0\u4e48\u4e00\u76f4\u662f\u4f7f\u7528\u4e09\u4e2a\u53c2\u6570\u5462&#xff1f;<\/p>\n<p>\u8fd9\u662f\u6709\u4e00\u5b9a\u5386\u53f2\u539f\u56e0\u5728\u91cc\u9762\u7684&#xff0c;\u51e0\u5341\u5e74\u4e86\u4e00\u76f4\u90fd\u8fd9\u4e48\u5199&#xff1b;\u8fd9\u4e09\u4e2a\u53c2\u6570\u4e2d&#xff0c;\u9664\u4e86\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u80fd\u8981\u53d8\u4e4b\u5916&#xff0c;\u5176\u4ed6\u7684\u53c2\u6570\u53ef\u80fd\u90fd\u6ca1\u6709\u53d8\u8fc7&#xff08;\u5f53\u7136&#xff0c;\u8fd9\u8bf4\u5230\u662f\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b&#xff09;\u3002\u6bd4\u5982&#xff0c;\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6307\u5b9a\u534f\u8bae\u65cf&#xff0c;\u8981\u6307\u5b9a\u7684\u539f\u56e0\u662f\u56e0\u4e3a\u51e0\u5341\u5e74\u524d\u4e0d\u4ec5\u4ec5\u53ea\u6709TCP\u534f\u8bae&#xff0c;\u8fd8\u6709\u5176\u4ed6\u5404\u5f0f\u5404\u6837\u7684\u534f\u8bae\u540c\u65f6\u5b58\u5728&#xff08;\u767e\u82b1\u9f50\u653e\u65f6\u671f&#xff09;&#xff0c;\u90a3\u65f6\u5019\u5c31\u662f\u7528\u7b2c\u4e00\u4e2a\u53c2\u6570\u6765\u6307\u5b9a\u7684&#xff0c;\u53ea\u662f\u540e\u9762\u7ecf\u8fc7\u6dd8\u6c70&#xff0c;\u5c31\u53ea\u7559\u4e0b\u4e86AF_*\u51e0\u4e2a&#xff08;\u76ee\u524d\u7528\u7684\u6700\u591a\u7684\u8fd8\u662fAF_INET&#xff09;\u3002\u7136\u800c&#xff0c;\u968f\u7740\u5386\u53f2\u7684\u8fc1\u79fb&#xff0c;\u4e3a\u4e86\u517c\u5bb9\u6027&#xff0c;\u8fd9\u4e09\u4e2a\u53c2\u6570\u5c31\u4e00\u76f4\u6ca1\u6709\u66f4\u6539\u8fc7\u3002<\/p>\n<p>\u8fd9\u91cc\u53ef\u80fd\u4f1a\u6709\u4e00\u4e2a\u7591\u95ee&#xff0c;socket\u662f\u4e00\u4e2aint\u7c7b\u578b\u7684\u503c&#xff0c;\u4e3a\u4ec0\u4e48\u662fint\u7684\u5462&#xff1f; \u8fd9\u610f\u5473\u7740\u540e\u9762\u5f88\u591a\u4e1c\u897f\u662f\u57fa\u4e8eint\u503c\u8fdb\u884c\u64cd\u4f5c\u7684&#xff0c;socket\u9ed8\u8ba4\u4ece0\u5f00\u59cb&#xff0c;\u4f9d\u6b21\u9012\u589e&#xff0c;\u5176\u4e2d0&#xff0c;1&#xff0c;2\u662f\u7cfb\u7edf\u786e\u5b9a\u7684&#xff0c;\u4ee3\u7740\u8fd9\u6807\u51c6\u8f93\u5165\u8f93\u51fa&#xff0c;\u5373stdin\u3001stdout\u3001stderr\u3002<\/p>\n<h3>2.2\u3001bind() \u51fd\u6570<\/h3>\n<p>socket()\u51fd\u6570\u89e3\u51b3\u4e86fd\u7684\u95ee\u9898&#xff0c;\u5373\u63d2\u53e3&#xff0c;\u8fd8\u9700\u8981\u4f7f\u7528bind()\u51fd\u6570\u63d0\u4f9b\u201c\u5ea7\u6392\u201d&#xff0c;\u5373\u7f51\u7edc\u90e8\u5206\u3002<\/p>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>addr: \u6307\u5411 sockaddr \u7ed3\u6784\u7684\u6307\u9488&#xff0c;\u5305\u542b\u8981\u7ed1\u5b9a\u7684\u5730\u5740\u4fe1\u606f\u3002<\/li>\n<li>addrlen: \u5730\u5740\u7ed3\u6784\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de0&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<p>\u8981\u60f3\u4f7f\u7528bind()\u51fd\u6570&#xff0c;\u8fd8\u9700\u8981\u4e86\u89e3\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7ed3\u6784\u4f53&#xff1a;struct sockaddr_in &#xff0c;\u5b83\u662f\u5728 C \u548c C&#043;&#043; \u7f16\u7a0b\u4e2d\u7528\u4e8e\u8868\u793a IPv4 \u5730\u5740\u7684\u7ed3\u6784\u4f53&#xff0c;\u5176\u5b9a\u4e49\u901a\u5e38\u5728 &lt;netinet\/in.h&gt; \u5934\u6587\u4ef6\u4e2d\u3002<\/p>\n<p>struct sockaddr_in \u7ed3\u6784\u4f53\u5b9a\u4e49&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">short<\/span> sin_family<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5730\u5740\u65cf&#xff0c;\u901a\u5e38\u4e3a AF_INET<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> sin_port<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7aef\u53e3\u53f7&#xff08;\u7f51\u7edc\u5b57\u8282\u5e8f&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> sin_addr<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ IPv4 \u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> sin_zero<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u586b\u5145\u5b57\u6bb5&#xff0c;\u7528\u4e8e\u4fdd\u6301\u7ed3\u6784\u4f53\u7684\u5bf9\u9f50<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<table>\n<tr>\u6210\u5458\u6570\u636e\u7c7b\u578b\u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td>sin_family<\/td>\n<td>short<\/td>\n<td align=\"left\">\u5730\u5740\u65cf\u5b57\u6bb5\u3002\u5bf9\u4e8e IPv4&#xff0c;\u901a\u5e38\u8bbe\u7f6e\u4e3a AF_INET\u3002 \u5176\u4ed6\u7684\u8fd8\u6709AF_INET6 &#xff08;IPv6&#xff09;\u3001 AF_UNIX &#xff08;\u672c\u5730\u901a\u4fe1&#xff09;\u3001 AF_PACKET &#xff08;\u94fe\u8def\u5c42&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>sin_port<\/td>\n<td>unsigned short<\/td>\n<td align=\"left\">16 \u4f4d\u7aef\u53e3\u53f7&#xff0c;\u4f7f\u7528\u7f51\u7edc\u5b57\u8282\u5e8f&#xff08;Big Endian&#xff09;\u3002\u53ef\u4ee5\u4f7f\u7528 htons() \u51fd\u6570\u8f6c\u6362\u4e3b\u673a\u5b57\u8282\u5e8f\u5230\u7f51\u7edc\u5b57\u8282\u5e8f\u3002<\/td>\n<\/tr>\n<tr>\n<td>sin_addr<\/td>\n<td>struct in_addr<\/td>\n<td align=\"left\">\u8868\u793a IPv4 \u5730\u5740\u7684\u7ed3\u6784\u4f53&#xff0c;\u5305\u542b\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b s_addr\u3002\u53ef\u4ee5\u4f7f\u7528 inet_pton() \u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u5730\u5740\u8f6c\u6362\u4e3a\u6b64\u683c\u5f0f\u3002<\/td>\n<\/tr>\n<tr>\n<td>sin_zero<\/td>\n<td>char[8]<\/td>\n<td align=\"left\">\u4fdd\u7559\u5b57\u6bb5&#xff0c;\u7528\u4e8e\u586b\u5145&#xff0c;\u786e\u4fdd struct sockaddr \u7684\u5927\u5c0f\u4e0e sockaddr_in \u7ed3\u6784\u4f53\u7684\u4e00\u81f4\u6027\u3002 \u901a\u5e38\u4e0d\u4f7f\u7528&#xff0c;\u53ef\u5c06\u5176\u7f6e\u4e3a0\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5176\u4e2dsin_addr \u662f\u4e00\u4e2a\u7c7b\u578b\u4e3a struct in_addr \u7684\u7ed3\u6784\u4f53&#xff0c;\u5176\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> s_addr<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 32 \u4f4d IPv4 \u5730\u5740&#xff0c;\u4ee5\u7f51\u7edc\u5b57\u8282\u5e8f\u5b58\u50a8<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>struct in_addr \u7ed3\u6784\u4f53\u7528\u4e8e\u8868\u793a IPv4 \u5730\u5740&#xff0c;\u5173\u952e\u5b57\u6bb5\u662f s_addr&#xff0c;\u5b83\u662f\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b&#xff08;32 \u4f4d&#xff09;\u3002\u8bbe\u7f6e s_addr \u7684\u503c\u53ef\u4ee5\u7528\u6765\u6307\u5b9a\u4e0d\u540c\u7684\u7f51\u7edc\u5730\u5740\u3002\u5e38\u7528\u7684 struct in_addr \u503c&#xff1a;<\/p>\n<table>\n<tr>\u540d\u79f0\u503c\u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td>INADDR_ANY<\/td>\n<td>0.0.0.0<\/td>\n<td align=\"left\">\u8868\u793a\u63a5\u6536\u6765\u81ea\u4efb\u610f IP \u5730\u5740\u7684\u8fde\u63a5\u3002\u670d\u52a1\u5668\u5e38\u7528\u6b64\u5730\u5740\u8fdb\u884c\u7ed1\u5b9a&#xff0c;\u5141\u8bb8\u63a5\u6536\u6765\u81ea\u6240\u6709\u63a5\u53e3\u7684\u8bf7\u6c42\u3002<\/td>\n<\/tr>\n<tr>\n<td>INADDR_LOOPBACK<\/td>\n<td>127.0.0.1<\/td>\n<td align=\"left\">\u672c\u5730\u56de\u73af\u5730\u5740&#xff0c;\u8868\u793a\u672c\u673a&#xff0c;\u5e38\u7528\u4e8e\u6d4b\u8bd5\u548c\u8c03\u8bd5\u7f51\u7edc\u5e94\u7528\u3002\u901a\u5e38\u53ef\u7528\u4e8e\u6d4b\u8bd5\u672c\u5730\u670d\u52a1\u3002<\/td>\n<\/tr>\n<tr>\n<td>INADDR_BROADCAST<\/td>\n<td>255.255.255.255<\/td>\n<td align=\"left\">\u5e7f\u64ad\u5730\u5740&#xff0c;\u7528\u4e8e\u5411\u7f51\u7edc\u4e2d\u6240\u6709\u4e3b\u673a\u53d1\u9001\u6570\u636e\u5305\u3002\u9002\u7528\u4e8e\u9700\u8981\u5411\u6240\u6709\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u53d1\u9001\u6570\u636e\u7684\u60c5\u51b5\u3002<\/td>\n<\/tr>\n<tr>\n<td>INADDR_NONE<\/td>\n<td>0xffffffff<\/td>\n<td align=\"left\">\u7528\u4e8e\u6307\u793a\u65e0\u6548\u5730\u5740&#xff0c;\u65e0\u8bba\u4f55\u65f6\u5e94\u89c6\u4e3a\u65e0\u6548\u6216\u672a\u6307\u5b9a\u3002<\/td>\n<\/tr>\n<tr>\n<td>INADDR_ALLHOSTS_GROUP<\/td>\n<td>224.0.0.1<\/td>\n<td align=\"left\">\u7279\u6b8a\u7684\u591a\u64ad\u5730\u5740&#xff0c;\u7528\u4e8eIPv4\u591a\u64ad&#xff0c;\u8868\u793a\u6240\u6709\u4e3b\u673a\u7ec4&#xff0c;\u63a5\u6536\u6b64\u5730\u5740\u5728\u540c\u4e00\u5b50\u7f51\u7684\u6240\u6709\u4e3b\u673a\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8981\u60f3\u7ed1\u5b9a\u5230\u4e00\u4e2a\u6307\u5b9a\u7684 IPv4 \u5730\u5740&#xff08;\u4f8b\u5982 192.168.1.1&#xff09;&#xff0c;\u9700\u8981\u4f7f\u7528 inet_pton() \u51fd\u6570\u6765\u5c06\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 IP \u5730\u5740\u8f6c\u6362\u4e3a struct in_addr \u7ed3\u6784\u4f53\u3002<\/p>\n<p>inet_pton() \u51fd\u6570\u7684\u539f\u578b\u5b9a\u4e49\u5728 &lt;arpa\/inet.h&gt; \u5934\u6587\u4ef6\u4e2d\u3002\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> family<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>str<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>int family: \u5730\u5740\u65cf&#xff0c;\u901a\u5e38\u4f7f\u7528 AF_INET&#xff08;IPv4&#xff09;\u6216 AF_INET6&#xff08;IPv6&#xff09;\u3002<\/li>\n<li>const char *str: \u8981\u8f6c\u6362\u7684 IP \u5730\u5740\u5b57\u7b26\u4e32&#xff0c;\u901a\u5e38\u662f\u70b9\u5206\u5341\u8fdb\u5236\u683c\u5f0f\u7684 IPv4 \u5730\u5740&#xff08;\u4f8b\u5982&#xff1a;\u201c192.168.1.1\u201d&#xff09;\u6216\u8005\u662f\u6807\u51c6\u7684 IPv6 \u5730\u5740\u5b57\u7b26\u4e32\u3002<\/li>\n<li>void *addr: \u6307\u5411 struct in_addr&#xff08;\u5bf9\u4e8e IPv4&#xff09;\u6216 struct in6_addr&#xff08;\u5bf9\u4e8e IPv6&#xff09;\u7ed3\u6784\u7684\u6307\u9488&#xff0c;\u7528\u4e8e\u5b58\u50a8\u8f6c\u6362\u540e\u7684\u5730\u5740\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;<\/p>\n<ul>\n<li>\u8fd4\u56de\u503c\u4e3a 1&#xff0c;\u8868\u793a\u8f6c\u6362\u6210\u529f\u3002<\/li>\n<li>\u8fd4\u56de\u503c\u4e3a 0&#xff0c;\u8868\u793a\u8f93\u5165\u5b57\u7b26\u4e32\u4e0d\u662f\u6709\u6548\u7684\u5730\u5740\u3002<\/li>\n<li>\u8fd4\u56de\u503c\u4e3a -1&#xff0c;\u8868\u793a\u53d1\u751f\u9519\u8bef&#xff0c;\u53ef\u4ee5\u4f7f\u7528 errno \u83b7\u53d6\u9519\u8bef\u7801\u3002<\/li>\n<\/ul>\n<p>inet_pton() \u662f\u4e00\u79cd\u66f4\u5b89\u5168\u548c\u73b0\u4ee3\u7684\u65b9\u6cd5&#xff0c;\u7528\u4e8e\u5c06 IP \u5730\u5740\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u683c\u5f0f&#xff0c;\u63a8\u8350\u4f7f\u7528&#xff0c;\u53d6\u4ee3\u4e86\u66f4\u65e9\u671f\u7684 inet_addr() \u51fd\u6570\u3002<\/p>\n<h3>2.3\u3001listen() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> backlog<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>backlog: \u6307\u5b9a\u7b49\u5f85\u8fde\u63a5\u7684\u6700\u5927\u6570\u91cf\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de0&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<p>listen()\u5c31\u50cf\u4e00\u4e2a\u9152\u5e97\u91cc\u7684\u8fce\u5bbe\u7684\u4eba&#xff0c;\u5f53\u5ba2\u6237\u7aef\u8fde\u63a5\u8fdb\u6765\u662f\u9996\u5148\u63a5\u89e6\u5230\u7684\u5c31\u662f\u8fd9\u4e2alisten&#xff0c;\u7136\u540e\u7531\u5c06\u5176\u5e26\u5230\u5927\u5802\u4ea4\u7ed9\u670d\u52a1\u5458\u6765\u4e3a\u4ed6\u63d0\u4f9b\u5176\u4ed6\u670d\u52a1\u3002<\/p>\n<h3>2.4\u3001accept() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">,<\/span> socklen_t <span class=\"token operator\">*<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket \u63cf\u8ff0\u7b26\u3002<\/li>\n<li>addr: \u53ef\u9009\u7684 sockaddr \u7ed3\u6784\u6307\u9488&#xff0c;\u7528\u6765\u5b58\u50a8\u5ba2\u6237\u7aef\u7684\u5730\u5740\u3002<\/li>\n<li>addrlen: \u53ef\u9009\u7684\u6307\u9488&#xff0c;\u7528\u4e8e\u8868\u793a\u5730\u5740\u7ed3\u6784\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684 socket \u63cf\u8ff0\u7b26&#xff0c;\u4ee3\u8868\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<p>\u5728\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u4e4b\u524d&#xff0c;\u5982\u4f55\u6ca1\u6709\u8c03\u7528fcntl()\u51fd\u6570\u8bbe\u7f6esocket fd\u4e3a\u975e\u963b\u585e\u6a21\u5f0f&#xff0c;\u7a0b\u5e8f\u4f1a\u4e00\u76f4\u963b\u585e\u4f4f&#xff0c;\u76f4\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u8fdb\u6765\u3002<\/p>\n<h3>2.5\u3001fcntl() \u51fd\u6570<\/h3>\n<p>fcntl() \u51fd\u6570\u7528\u4e8e\u5728 UNIX \u548c\u7c7b UNIX \u7cfb\u7edf\u7f16\u7a0b\u4e2d\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u6267\u884c\u63a7\u5236\u64cd\u4f5c\u3002fcntl() \u63d0\u4f9b\u4e86\u591a\u79cd\u529f\u80fd&#xff0c;\u5305\u62ec\u590d\u5236\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u6539\u53d8\u63cf\u8ff0\u7b26\u7684\u5c5e\u6027\u3001\u83b7\u53d6\u5f53\u524d\u72b6\u6001\u7b49\u3002<\/p>\n<p>fcntl() \u51fd\u6570\u7684\u539f\u578b\u5b9a\u4e49\u5728 &lt;fcntl.h&gt; \u5934\u6587\u4ef6\u4e2d&#xff0c;\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> cmd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token comment\">\/* arg *\/<\/span> <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>int fd: \u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u901a\u5e38\u662f\u901a\u8fc7 open() \u6216 socket() \u7b49\u51fd\u6570\u83b7\u5f97\u7684\u3002<\/li>\n<li>int cmd: \u63a7\u5236\u547d\u4ee4&#xff0c;\u51b3\u5b9a\u6267\u884c\u7684\u64cd\u4f5c\u3002<\/li>\n<li>&#8230; \/* arg *\/: \u53ef\u9009\u53c2\u6570&#xff0c;\u5177\u4f53\u4f9d\u8d56\u4e8e cmd \u7684\u503c\u3002\u4f8b\u5982&#xff0c;\u67d0\u4e9b\u547d\u4ee4\u9700\u8981\u989d\u5916\u7684\u53c2\u6570\u6765\u6267\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f fcntl() \u51fd\u6570\u4e2d int cmd \u53c2\u6570\u7684\u5e38\u7528\u503c&#xff1a;<\/p>\n<table>\n<tr>\u547d\u4ee4 (cmd)\u503c\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>F_DUPFD<\/td>\n<td>0<\/td>\n<td align=\"left\">\u590d\u5236\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5e76\u8fd4\u56de\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_GETFD<\/td>\n<td>1<\/td>\n<td align=\"left\">\u83b7\u53d6\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6807\u5fd7\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETFD<\/td>\n<td>2<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6807\u5fd7\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_GETFL<\/td>\n<td>3<\/td>\n<td align=\"left\">\u83b7\u53d6\u6587\u4ef6\u72b6\u6001\u6807\u5fd7\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETFL<\/td>\n<td>4<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u72b6\u6001\u6807\u5fd7\u3002 (O_NONBLOCK, O_APPEND \u7b49)<\/td>\n<\/tr>\n<tr>\n<td>F_GETLK<\/td>\n<td>5<\/td>\n<td align=\"left\">\u83b7\u53d6\u6587\u4ef6\u9501\u5b9a\u7684\u4fe1\u606f\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETLK<\/td>\n<td>6<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u9501\u5b9a&#xff08;\u975e\u963b\u585e&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETLKW<\/td>\n<td>7<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u9501\u5b9a&#xff08;\u963b\u585e&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_GETOWN<\/td>\n<td>8<\/td>\n<td align=\"left\">\u83b7\u53d6\u5f02\u6b65 I\/O \u6240\u6709\u8005\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETOWN<\/td>\n<td>9<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u5f02\u6b65 I\/O \u6240\u6709\u8005\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_GETSIG<\/td>\n<td>10<\/td>\n<td align=\"left\">\u83b7\u53d6\u5f02\u6b65 I\/O \u7684\u4fe1\u53f7\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETSIG<\/td>\n<td>11<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u5f02\u6b65 I\/O \u7684\u4fe1\u53f7\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_GETLK64<\/td>\n<td>12<\/td>\n<td align=\"left\">\u83b7\u53d6\u6587\u4ef6\u9501\u5b9a\u7684\u4fe1\u606f&#xff08;64 \u4f4d\u7248&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETLK64<\/td>\n<td>13<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u9501\u5b9a&#xff08;64 \u4f4d\u7248&#xff0c;\u975e\u963b\u585e&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>F_SETLKW64<\/td>\n<td>14<\/td>\n<td align=\"left\">\u8bbe\u7f6e\u6587\u4ef6\u9501\u5b9a&#xff08;64 \u4f4d\u7248&#xff0c;\u963b\u585e&#xff09;\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f&#xff1a;\u5173\u4e8e\u6587\u4ef6\u9501\u7684 F_GETLK, F_SETLK, \u548c F_SETLKW \u547d\u4ee4\u9700\u8981\u4e00\u4e2a struct flock \u7ed3\u6784\u4f53\u4f5c\u4e3a\u53ef\u9009\u53c2\u6570&#xff0c;\u7528\u4e8e\u63cf\u8ff0\u9501\u7684\u7c7b\u578b\u3001\u504f\u79fb\u91cf\u548c\u957f\u5ea6\u7b49\u3002F_GETLK64, F_SETLK64, \u548c F_SETLKW64 \u662f\u9488\u5bf9\u5927\u6587\u4ef6&#xff08;\u901a\u5e38\u662f\u5927\u4e8e 2GB \u7684\u6587\u4ef6&#xff09;\u7684\u9501\u5b9a\u64cd\u4f5c\u3002<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;<\/p>\n<ul>\n<li>\u6210\u529f\u65f6&#xff0c;fcntl() \u8fd4\u56de\u53d6\u51b3\u4e8e cmd \u7684\u7279\u5b9a\u503c\u3002\u5bf9\u4e8e F_GETFD \u548c F_GETFL\u7b49\u547d\u4ee4&#xff0c;\u8fd9\u5c06\u662f\u6240\u8bf7\u6c42\u7684\u72b6\u6001\u6807\u5fd7&#xff1b;\u5bf9\u4e8e F_DUPFD&#xff0c;\u8fd4\u56de\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>\u5931\u8d25\u65f6&#xff0c;\u8fd4\u56de -1&#xff0c;\u5e76\u8bbe\u7f6e errno \u4ee5\u6307\u793a\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u7f51\u7edc IO \u8bbe\u7f6e\u963b\u585e\u548c\u975e\u963b\u585e&#xff0c;\u4e3b\u8981\u4f7f\u7528F_GETFL\u548cF_SETFL\u4e24\u4e2a\u3002\u8bbe\u7f6e\u6807\u5fd7\u65f6\u6700\u597d\u8981\u5148\u628a\u4e4b\u524d\u7684\u6807\u5fd7\u83b7\u53d6\u51fa\u6765&#xff0c;\u7136\u540e\u901a\u8fc7\u4f4d\u8fd0\u7b97\u628a\u7f51\u7edc IO \u6a21\u5f0f \u201c\u6216&#xff08;|&#xff09;\u201d\u8fdb\u53bb&#xff0c;\u4e0d\u8981\u76f4\u63a5\u8bbe\u7f6e&#xff0c;\u8fd9\u4f1a\u628a\u5b83\u4e4b\u524d\u7684\u5176\u4ed6\u6807\u5fd7\u5168\u90e8\u6e05\u9664\u4e86&#xff0c;\u662f\u975e\u5e38\u4e0d\u5efa\u8bae\u76f4\u63a5\u8bbe\u7f6e\u7684\u3002<\/p>\n<h3>2.6\u3001connect() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>addr: \u6307\u5411 sockaddr \u7ed3\u6784\u7684\u6307\u9488&#xff0c;\u5305\u542b\u8981\u8fde\u63a5\u7684\u670d\u52a1\u5668\u5730\u5740\u3002<\/li>\n<li>addrlen: \u5730\u5740\u7ed3\u6784\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de0&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<h3>2.7\u3001send() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<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> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf: \u6307\u5411\u8981\u53d1\u9001\u7684\u6570\u636e\u7684\u6307\u9488\u3002<\/li>\n<li>len: \u8981\u53d1\u9001\u7684\u5b57\u8282\u6570\u3002<\/li>\n<li>flags: \u901a\u5e38\u8bbe\u7f6e\u4e3a0\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u53d1\u9001\u7684\u5b57\u8282\u6570&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;send()\u8fd4\u56de\u4e00\u4e2a\u5927\u4e8e0\u7684\u6570\u5e76\u4e0d\u610f\u5473\u53d1\u9001\u6210\u529f&#xff0c;\u6570\u636e\u5e76\u4e0d\u4e00\u5b9a\u5df2\u7ecf\u53d1\u9001\u51fa\u53bb\u4e86\u3002send()\u53ea\u662f\u5c06\u6570\u636e\u62f7\u8d1d\u5230\u534f\u8bae\u6808&#xff0c;\u4ec0\u4e48\u65f6\u5019\u53d1\u9001\u51fa\u53bb\u4e0d\u662f\u6211\u4eec\u51b3\u5b9a\u7684\u3002\u8981\u5224\u65ad\u53d1\u9001\u7684\u6570\u636e\u662f\u5426\u5df2\u7ecf\u88ab\u5bf9\u7aef\u63a5\u6536\u5230&#xff0c;\u53ea\u6709\u4e00\u4e2a\u6807\u51c6&#xff1a;\u5bf9\u7aef\u56de\u4e86\u786e\u8ba4\u6d88\u606f\u3002\u867d\u7136TCP \u6709 ACK \u673a\u5236&#xff0c;\u4f46\u5728\u4e1a\u52a1\u5c42\u662f\u611f\u77e5\u4e0d\u5230\u7684&#xff1b;\u7279\u522b\u662f\u8fdb\u7a0b\u9000\u51fa\u7684\u65f6\u5019&#xff0c;\u5b83\u5f88\u96be\u77e5\u9053\u662f\u5426\u53d1\u9001\u6210\u529f\u3002<\/p>\n<h3>2.8\u3001recv() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<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> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>sockfd: socket\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf: \u6307\u5411\u63a5\u6536\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/li>\n<li>len: \u7f13\u51b2\u533a\u7684\u5927\u5c0f\u3002<\/li>\n<li>flags: \u901a\u5e38\u8bbe\u7f6e\u4e3a0\u3002<\/li>\n<\/ul>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u63a5\u6536\u5230\u7684\u5b57\u8282\u6570&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1&#xff0c;\u8fde\u63a5\u5173\u95ed\u65f6\u8fd4\u56de0\u3002<\/p>\n<h3>2.9\u3001close() \u51fd\u6570<\/h3>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/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;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>fd:\u662f\u9700\u8981\u5173\u95ed\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u5728\u8fd9\u91cc\u662fsocket\u63cf\u8ff0\u7b26&#xff09;\u3002\u6210\u529f\u65f6\u8fd4\u56de0&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<h2>\u4e09\u3001\u963b\u585e\u548c\u975e\u963b\u585e\u7684\u533a\u522b<\/h2>\n<p>\u963b\u585e\u4f1a\u4e00\u76f4\u7b49\u5f85\u6570\u636e\u5230\u6765\u624d\u4f1a\u8fd4\u56de\u3002\u975e\u963b\u585e\u4f1a\u7acb\u5373\u8fd4\u56de&#xff0c;\u4e0d\u7ba1\u6709\u6ca1\u6709\u6570\u636e\u3002<\/p>\n<p>\u90a3\u4e48&#xff0c;\u5728\u7f51\u7edc\u7f16\u7a0b\u4e2daccept()\u51fd\u6570\u5230\u5e95\u963b\u585e\u5728\u54ea\u91cc&#xff1f;\u963b\u585e\u7684\u6761\u4ef6\u662f\u4ec0\u4e48&#xff1f;<\/p>\n<p>accept() \u51fd\u6570\u963b\u585e\u5728 \u7b49\u5f85\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42 \u7684\u8fc7\u7a0b\u4e2d\u3002accept() \u51fd\u6570\u7684\u963b\u585e\u5e76\u975e\u53d1\u751f\u5728\u7279\u5b9a\u7684\u4ee3\u7801\u884c&#xff0c;\u800c\u662f\u5728 \u5185\u6838\u7b49\u5f85\u8fde\u63a5\u8bf7\u6c42\u5230\u8fbe \u7684\u8fc7\u7a0b\u4e2d\u3002\u5185\u6838\u4f1a\u5728\u540e\u53f0\u6301\u7eed\u76d1\u542c\u7f51\u7edc\u63a5\u53e3&#xff0c;\u4e00\u65e6\u68c0\u6d4b\u5230\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u5c31\u4f1a\u5c06\u8bf7\u6c42\u653e\u5165\u8fde\u63a5\u961f\u5217\u4e2d&#xff0c;\u5e76\u5c06 accept() \u51fd\u6570\u4ece\u963b\u585e\u72b6\u6001\u5524\u9192\u3002<\/p>\n<p>\u963b\u585e\u7684\u6761\u4ef6\u5305\u62ec&#xff1a;<\/p>\n<li>\n<p>\u6ca1\u6709\u8fde\u63a5\u8bf7\u6c42 \u3002<\/p>\n<\/li>\n<li>\n<p>\u8fde\u63a5\u961f\u5217\u5df2\u6ee1\u3002<\/p>\n<\/li>\n<h2>\u56db\u3001\u5982\u4f55\u5f00\u53d1\u4e00\u4e2aTCP\u670d\u52a1\u5668&#xff1f;<\/h2>\n<p>\u5f00\u53d1 TCP \u670d\u52a1\u5668\u7684\u57fa\u672c\u6b65\u9aa4&#xff1a;<\/p>\n<li>\u521b\u5efa\u4e00\u4e2a socket\u3002<\/li>\n<li>\u8bbe\u7f6e\u7aef\u53e3\u5e76\u7ed1\u5b9a\u3002<\/li>\n<li>\u8bbe\u7f6e\u7f51\u7edcIO\u7684\u963b\u585e\u6a21\u5f0f\u8fd8\u662f\u975e\u963b\u585e\u6a21\u5f0f&#xff0c;\u9ed8\u8ba4\u662f\u963b\u585e\u6a21\u5f0f\u3002<\/li>\n<li>\u76d1\u542c\u7aef\u53e3\u3002<\/li>\n<li>\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/li>\n<li>\u8bbe\u7f6e\u5ba2\u6237\u7aefsocket fd \u7684\u7f51\u7edc IO \u662f\u963b\u585e\u6a21\u5f0f\u8fd8\u662f\u975e\u963b\u585e\u6a21\u5f0f&#xff0c;\u9ed8\u8ba4\u662f\u963b\u585e\u6a21\u5f0f\u3002<\/li>\n<li>\u6536\u53d1\u6570\u636e&#xff0c;\u6570\u636e\u5904\u7406\u3002<\/li>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u5730\u201c\u4e00\u95ee\u4e00\u7b54\u201d\u7684\u670d\u52a1\u5668\u793a\u610f\u56fe&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419051635-680331b368da5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u4e0b\u9762\u7684\u4ee3\u7801\u6bcf\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u6570\u636e&#xff0c;\u56e0\u6b64\u4e5f\u662f\u6700\u57fa\u7840\u7684\u201c\u4e00\u95ee\u4e00\u7b54\u201d\u7684\u670d\u52a1\u5668\u3002<\/p>\n<p>\u670d\u52a1\u5668\u7aef\u4ee3\u7801&#xff1a;<\/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;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;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&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;iostream&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\">PORT<\/span>            <span class=\"token expression\"><span class=\"token number\">8080<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LINSTEN_BLOCK<\/span>   <span class=\"token expression\"><span class=\"token number\">20<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BUFFER_LEN<\/span>      <span class=\"token expression\"><span class=\"token number\">4096<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SET_NONBLOCK<\/span>    <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">setIoMode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> mode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. Create socket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> listenfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>listenfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;socket return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<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><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. Set the port and bind it.<\/span><br \/>\n    sockaddr_in serverAddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>serverAddr<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>sockaddr_in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    serverAddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>INADDR_ANY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ bind ip address.<\/span><br \/>\n    serverAddr<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\">\/\/ bind port.<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>sockaddr<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>serverAddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serverAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">if<\/span> <span class=\"token expression\">SET_NONBLOCK<\/span><\/span><br \/>\n    <span class=\"token comment\">\/\/ set nonblock mode.<\/span><br \/>\n    <span class=\"token function\">setIoMode<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> O_NONBLOCK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">endif<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. listening port.<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> LINSTEN_BLOCK<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;listen return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;server listening port &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> PORT <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/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 comment\">\/\/ 4. accept connect.<\/span><br \/>\n        sockaddr_in clientAddr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>clientAddr<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>clientAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socklen_t clienLen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>clientAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> clientfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>sockaddr <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>clientAddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>clienLen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>clientfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;accept return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<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        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;client fd &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> clientfd <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 5. send message.<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>msg <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello, Client!&#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>clientfd<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>msg<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\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;send buffer return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 6. recv message<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFER_LEN<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>clientfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> BUFFER_LEN<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recv buffer return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>clientfd<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        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recv buffer: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <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\">bool<\/span> <span class=\"token function\">setIoMode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> mode<span class=\"token punctuation\">)<\/span><br \/>\n<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>fd<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flag <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fcntl get flags return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<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    flag <span class=\"token operator\">|&#061;<\/span> O_NONBLOCK<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> F_SETFL<span class=\"token punctuation\">,<\/span> flag<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fcntl set flags return &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<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<p>\u5ba2\u6237\u7aef\u4ee3\u7801&#xff1a;<\/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;iostream&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;cstring&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 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    sockaddr_in serv_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    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_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>serv_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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>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 punctuation\">;<\/span><\/p>\n<p>    <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 punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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><br \/>\n    std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Message from server: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>\u4e94\u3001\u603b\u7ed3<\/h2>\n<p>\u4ee5\u4e0a\u662fLinux C&#043;&#043; socket 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\u670d\u52a1\u5668\uff0c\u8ba9\u4f60\u4f53\u9a8c\u7f51\u7edc\u7f16\u7a0b\u7684\u9b45\u529b\u3002\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\u963b\u585e\u548c\u975e\u963b\u585e IO \u7684\u533a\u522b\uff0c\u5e76\u89e3\u6790\u5982\u4f55\u5229\u7528\u8fd9\u4e9b\u77e5\u8bc6\u6784\u5efa\u51fa\u7a33\u5b9a\u7684\u7f51\u7edc\u7a0b\u5e8f\u3002\u51c6\u5907\u597d\u8fce\u63a5\u6311\u6218\uff0c\u5f00\u542f\u4f60\u7684 Linux \u7f51\u7edc\u7f16\u7a0b\u4e4b\u65c5\u5427\uff01_linux tcp \u670d\u52a1\u5668<\/p>\n","protected":false},"author":2,"featured_media":25621,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,58,584,205,190,43,78,44],"topic":[],"class_list":{"0":"post-25624","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-server","8":"tag-c","9":"tag-linux","11":"tag-tcp-ip","12":"tag-190","13":"tag-43","14":"tag-78","15":"tag-44"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux \u7f51\u7edc\u7f16\u7a0b\u57fa\u7840\uff1a\u6784\u5efa\u4f60\u7684\u7b2c\u4e00\u4e2a TCP \u670d\u52a1\u5668 - \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\/25624.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux \u7f51\u7edc\u7f16\u7a0b\u57fa\u7840\uff1a\u6784\u5efa\u4f60\u7684\u7b2c\u4e00\u4e2a TCP \u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.1k\u6b21\uff0c\u70b9\u8d5e17\u6b21\uff0c\u6536\u85cf28\u6b21\u3002\u5728\u73b0\u4ee3\u4e92\u8054\u7f51\u5e94\u7528\u4e2d\uff0c\u7f51\u7edc\u7f16\u7a0b\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002Linux\u4f5c\u4e3a\u5f3a\u5927\u7684\u670d\u52a1\u5668\u5e73\u53f0\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u6784\u5efa\u9ad8\u6548\u3001\u53ef\u9760\u7684\u7f51\u7edc\u5e94\u7528\u3002\u672c\u6587\u5c06\u5e26\u4f60\u8d70\u8fdb Linux \u7f51\u7edc\u7f16\u7a0b\u7684\u4e16\u754c\uff0c\u4ece\u6700\u57fa\u7840\u7684 IO \u6982\u5ff5\u5165\u624b\uff0c\u9010\u6b65\u5b66\u4e60 Socket \u51fd\u6570\u7684\u4f7f\u7528\uff0c\u5e76\u901a\u8fc7\u6784\u5efa\u4e00\u4e2a\u7b80\u5355\u7684 TCP \u670d\u52a1\u5668\uff0c\u8ba9\u4f60\u4f53\u9a8c\u7f51\u7edc\u7f16\u7a0b\u7684\u9b45\u529b\u3002\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\u963b\u585e\u548c\u975e\u963b\u585e IO \u7684\u533a\u522b\uff0c\u5e76\u89e3\u6790\u5982\u4f55\u5229\u7528\u8fd9\u4e9b\u77e5\u8bc6\u6784\u5efa\u51fa\u7a33\u5b9a\u7684\u7f51\u7edc\u7a0b\u5e8f\u3002\u51c6\u5907\u597d\u8fce\u63a5\u6311\u6218\uff0c\u5f00\u542f\u4f60\u7684 Linux \u7f51\u7edc\u7f16\u7a0b\u4e4b\u65c5\u5427\uff01_linux tcp \u670d\u52a1\u5668\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/25624.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" 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