{"id":32247,"date":"2025-04-23T11:51:16","date_gmt":"2025-04-23T03:51:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32247.html"},"modified":"2025-04-23T11:51:16","modified_gmt":"2025-04-23T03:51:16","slug":"%e3%80%90c%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8webserver%e3%80%91-12%ef%bc%9atcp%e8%af%a6%e8%a7%a3%e5%8f%8a%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32247.html","title":{"rendered":"\u3010C++\u9ad8\u5e76\u53d1\u670d\u52a1\u5668WebServer\u3011-12\uff1aTCP\u8be6\u89e3\u53ca\u5b9e\u73b0"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035110-680863ae3e2ab.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <\/p>\n<h4>\u672c\u6587\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001TCP\u901a\u4fe1\u6d41\u7a0b<\/li>\n<li>\u4e8c\u3001\u5957\u63a5\u5b57\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>2.1 socket()<\/li>\n<li>2.2 bind()<\/li>\n<li>2.3 listen()<\/li>\n<li>2.4 accept()<\/li>\n<li>2.5 connect()<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001demo\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>3.1 server\u7aef\u4ee3\u7801<\/li>\n<li>3.2 client\u7aef\u4ee3\u7801<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001TCP\u4e09\u6b21\u63e1\u624b<\/li>\n<li>\u4e94\u3001TCP\u6ed1\u52a8\u7a97\u53e3<\/li>\n<li>\u516d\u3001TCP\u56db\u6b21\u6325\u624b<\/li>\n<li>\u4e03\u3001\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<\/ul>\n<h2>\u4e00\u3001TCP\u901a\u4fe1\u6d41\u7a0b<\/h2>\n<p>\u5148\u6765\u8bb2\u8bb2\u670d\u52a1\u5668\u7aef&#xff0c;\u662f\u88ab\u52a8\u63a5\u53d7\u8fde\u63a5\u7684\u89d2\u8272&#xff0c;\u56e0\u4e3a\u662f\u88ab\u52a8\u7684&#xff0c;\u6240\u4ee5\u9700\u8981\u5148\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u76d1\u542c\u7684\u5957\u63a5\u5b57fd\u3002\u76d1\u542c\u6709\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u3002\u5957\u63a5\u5b57\u5c31\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>socket\u521b\u5efa\u7684fd\u4f1a\u6709\u5bf9\u5e94\u7684\u8bfb\u5199\u7f13\u51b2\u533a&#xff0c;\u7136\u540e\u5c06\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26\u548c\u672c\u5730IP&#043;\u7aef\u53e3\u7ed1\u5b9a&#xff08;IP&#043;\u7aef\u53e3\u5c31\u662f\u670d\u52a1\u5668\u7684\u5730\u5740\u4fe1\u606f&#xff09;&#xff0c;\u8fd9\u4e00\u6b65\u4e5f\u5c31\u662fbind&#xff0c;\u7136\u540e\u518d\u8fdb\u884clisten\u3002<\/p>\n<p>\u5f00\u59cb\u76d1\u542c\u4e4b\u540e&#xff0c;\u5c31\u662f\u963b\u585e\u7b49\u5f85&#xff0c;\u5f53\u6709\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5&#xff0c;\u4f1a\u5411\u76d1\u542c\u7684fd\u8bfb\u7f13\u51b2\u533a\u5199\u6570\u636e&#xff0c;\u89e3\u9664\u963b\u585e&#xff0c;\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u65f6\u5019&#xff0c;\u4f1a\u5f97\u5230\u4e00\u4e2a\u548c\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u5957\u63a5\u5b57fd&#xff0c;\u8fd9\u4e2afd\u662f\u65b0\u7684&#xff0c;\u4f1a\u6709\u65b0\u7684\u8bfb\/\u5199\u7f13\u51b2\u533a\u3002<\/p>\n<p>\u7136\u540e\u6765\u770b\u770b\u5ba2\u6237\u7aef\u7684\u6d41\u7a0b&#xff0c;\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u901a\u4fe1\u7684\u5957\u63a5\u5b57fd&#xff0c;\u7136\u540e\u8fde\u63a5\u670d\u52a1\u5668&#xff0c;\u9700\u8981\u6307\u5b9a\u8fde\u63a5\u7684\u670d\u52a1\u5668\u7684IP\u548c\u7aef\u53e3&#xff0c;\u5982\u679c\u8fde\u63a5\u6210\u529f\u4e86\u5c31\u53ef\u4ee5\u76f4\u63a5\u548c\u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n<p>\u4e0b\u56fe\u662fTCP\u901a\u4fe1\u6d41\u7a0b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035110-680863ae95bf6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e8c\u3001\u5957\u63a5\u5b57\u51fd\u6570<\/h2>\n<p>\u5957\u63a5\u5b57\u7684\u5934\u6587\u4ef6\u4e3b\u8981\u6709\u4e09\u4e2a&#xff0c; \u5982\u4e0b\u6240\u793a\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.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><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span> <span class=\"token comment\">\/\/ \u5305\u542b\u4e86\u8fd9\u4e2a\u5934\u6587\u4ef6&#xff0c;\u4e0a\u9762\u4e24\u4e2a\u5c31\u53ef\u4ee5\u7701\u7565<\/span><\/span><\/p>\n<p>\u5177\u4f53\u7684\u51fd\u6570\u6709\u4ee5\u4e0b\u51e0\u4e2a\u5e38\u7528\u7684&#xff0c;\u63a5\u4e0b\u6765\u6328\u4e2a\u6765\u770b\u770b\u4f5c\u7528\u548c\u4f7f\u7528\u3002<\/p>\n<p><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><br \/>\n<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><br \/>\n<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><br \/>\n<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\">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 <span class=\"token operator\">*<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<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>ssize_t <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span>size_t count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nssize_t <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span>size_t count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>2.1 socket()<\/h3>\n<p><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<p>\u529f\u80fd&#xff1a;\u521b\u5efa\u4e00\u4e2a\u5957\u63a5\u5b57\u3002\u6211\u4eec\u6765\u67e5\u770b\u4e0blinux\u6587\u6863\u4e2d\u7cfb\u7edf\u51fd\u6570\u5e93\u4e2dsocket\u7684\u5b9a\u4e49\u3002man 2 socket&#xff0c;\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035111-680863af236f2.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53c2\u65701\u3010domain\u3011&#xff1a;\u534f\u8bae\u65cf\u3002\u5e38\u89c1\u7684\u534f\u8bae\u65cfprotocol familiy&#xff0c;\u4e5f\u79f0\u4e3adomain\u3002\u534f\u8bae\u65cf\u7684\u5185\u5bb9\u90fd\u5b9a\u4e49\u5728\u4e86\u5934\u6587\u4ef6&lt;sys\/socket.h&gt;\u5f53\u4e2d\u3002<\/p>\n<p>AF_INET\u4ee3\u8868IPv4&#xff0c;AF_INET6\u4ee3\u8868ipv6&#xff0c;AF_UNIX\u548cAF_LCOAL\u4ee3\u8868\u672c\u5730\u5957\u63a5\u5b57\u901a\u4fe1&#xff08;\u4e5f\u5c31\u662f\u8fdb\u7a0b\u95f4\u901a\u4fe1&#xff09;\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035111-680863af5dee9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035111-680863afa1f95.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u7b2c\u4e8c\u53c2\u6570\u3010type\u3011&#xff1a;\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7684\u534f\u8bae\u7c7b\u578b\u3002 SOCK_STREAM\u6d41\u5f0f\u534f\u8bae&#xff08;TCP&#xff09;&#xff0c;SOCK_DGRAM\u62a5\u5f0f\u534f\u8bae&#xff08;\u5982UDP\u7b49\u7b49&#xff09;\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035111-680863afd1b07.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u7b2c\u4e09\u4e2a\u53c2\u6570\u3010protocol\u3011&#xff1a;\u5177\u4f53\u7684\u4e00\u4e2a\u534f\u8bae&#xff0c;\u4e00\u822c\u51990\u3002 \u6d41\u5f0f\u62a5\u534f\u8bae\u9ed8\u8ba4\u4f7f\u7528TCP&#xff0c;\u62a5\u5f0f\u534f\u8bae\u9ed8\u8ba4\u4f7f\u7528UDP\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035112-680863b032b99.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5c31\u662f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u64cd\u4f5c\u7684\u5c31\u662f\u5185\u6838\u7684\u4e00\u4e2a\u7f13\u51b2\u533a&#xff08;\u5305\u62ec\u4e86\u8bfb\u548c\u5199\u7f13\u51b2\u533a&#xff09;\u3002\u5931\u8d25\u4e86\u5c31\u4f1a\u8fd4\u56de-1\u3002<\/p>\n<h3>2.2 bind()<\/h3>\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>\u4f5c\u7528\u5c31\u662f\u5c06fd\u548c\u672c\u5730\u7684IP&#043;\u7aef\u53e3\u8fdb\u884c\u7ed1\u5b9a\u3002<\/p>\n<p>\u4e09\u4e2a\u53c2\u6570&#xff0c;sockfd\u662f\u901a\u8fc7socket\u51fd\u6570\u83b7\u5f97\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u3002addr\u5c31\u662f\u9700\u8981\u7ed1\u5b9a\u7684socket\u5730\u5740&#xff0c;\u5c01\u88c5\u4e86ip\u548c\u7aef\u53e3\u53f7\u7684\u4fe1\u606f\u3002addrlen\u662f\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7ed3\u6784\u4f53\u6240\u5360\u7684\u5185\u5b58\u7684\u5927\u5c0f\u3002<\/p>\n<h3>2.3 listen()<\/h3>\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>\u4f5c\u7528\u662f\u8fdb\u884c\u76d1\u542c&#xff0c;\u76d1\u542c\u8fd9\u4e2asocket\u4e0a\u7684\u8fde\u63a5\u3002<\/p>\n<p>sockfd\u5c31\u662f\u901a\u8fc7socket()\u5f97\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;backlog\u662f\u672a\u8fde\u63a5\u548c\u5df2\u8fde\u63a5\u7684\u548c\u7684\u6700\u5927\u503c\u3002<\/p>\n<p>\u8c03\u7528listen\u5728\u5e95\u5c42\u4f1a\u6709\u4e24\u4e2a\u961f\u5217&#xff0c;\u4e00\u4e2a\u662f\u672a\u8fde\u63a5\u7684\u961f\u5217&#xff0c;\u4e00\u4e2a\u662f\u5df2\u7ecf\u8fde\u63a5\u7684\u961f\u5217\u3002\u8d85\u8fc7\u4e86backlog\u5c31\u4f1a\u4e22\u5931\u3002&#xff08;\u4e00\u822c\u4e0d\u7528\u6307\u5b9a\u592a\u5927\u3002&#xff09;<\/p>\n<p>\u8fd9\u4e2abacklog\u6700\u5927\u503c\u5728\u8def\u5f84\/proc\/sys\/net\/core\/somaxconn\u4e0b\u53ef\u4ee5\u67e5\u770b\u5230\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035112-680863b07ca6d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>2.4 accept()<\/h3>\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\">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 <span class=\"token operator\">*<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u9ed8\u8ba4\u662f\u4e00\u4e2a\u963b\u585e\u7684\u51fd\u6570&#xff0c;\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<p>addr&#xff1a;\u4f20\u51fa\u53c2\u6570&#xff0c;\u8bb0\u5f55\u8fde\u63a5\u6210\u529f\u540e\u7684\u5ba2\u6237\u7aef\u7684\u5730\u5740\u4fe1\u606f&#xff08;ip&#043;port&#xff09;\u3002addrlen&#xff1a;\u6307\u5b9a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u5bf9\u5e94\u7684\u5185\u5b58\u5927\u5c0f\u3002<\/p>\n<p>\u6210\u529f\u5c31\u8fd4\u56de\u7528\u4e8e\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e13\u95e8\u7528\u6765\u901a\u4fe1\u7684&#xff0c;\u5931\u8d25\u4e86\u8fd4\u56de-1\u3002<\/p>\n<h3>2.5 connect()<\/h3>\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>\u8fd9\u4e2a\u662f\u5ba2\u6237\u7aef\u7528\u4e8e\u8fde\u63a5\u670d\u52a1\u5668\u7684\u51fd\u6570\u3002<\/p>\n<p>sockfd\u7528\u4e8e\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8c03\u7528socket\u521b\u5efa\u7684\u3002addr\u5ba2\u6237\u7aef\u8981\u8fde\u63a5\u7684\u670d\u52a1\u5668\u5730\u5740\u4fe1\u606f\u3002<\/p>\n<p>\u7b2c\u4e09\u4e2a\u53c2\u6570addrlen\u53ef\u4ee5\u76f4\u63a5sizeof&#xff08;addrlen&#xff09;&#xff0c;\u4f46\u662f\u4e0a\u9762accpet\u662f\u4e0d\u884c\u7684&#xff0c;\u9700\u8981\u5b9a\u4e49\u67d0\u4e2a\u53c2\u6570&#061;addrlen&#xff0c;\u7136\u540e\u628a\u8fd9\u4e2a\u53c2\u6570\u7684\u5730\u5740\u4f20\u5165\u7ed9accpet\u4f5c\u4e3a\u7b2c\u4e09\u4e2a\u53c2\u6570\u3002<\/p>\n<h2>\u4e09\u3001demo\u5b9e\u73b0<\/h2>\n<h3>3.1 server\u7aef\u4ee3\u7801<\/h3>\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;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;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;stdlib.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><\/p>\n<p>    <span class=\"token comment\">\/\/1.\u521b\u5efasocket&#xff08;\u7528\u4e8e\u521b\u5efa\u5957\u4ef6\u5b57&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ lfd \u5c31\u662flisten_fd&#xff0c;\u7528\u4e8e\u76d1\u542c\u7684fd\u3002<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <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 comment\">\/\/\u4ee3\u7801\u5065\u58ee\u6027&#xff0c;\u5224\u65ad\u8fd4\u56de\u503c<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lfd<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/2. bind\u7ed1\u5b9a<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> saddr<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u9700\u8981\u521d\u59cb\u5316&#xff0c;\u4e0d\u7136\u4f1a\u968f\u673a\u6570\u636e<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u628a\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u6210\u7f51\u7edc\u5b57\u8282\u5e8f&#xff0c;\u7136\u540e\u5b58\u7ed9\u7b2c\u4e09\u4e2a\u4f20\u51fa\u53c2\u6570<\/span><br \/>\n    <span class=\"token comment\">\/\/inet_pton(AF_INET,&#034;127.0.0.1&#034;,saddr.sin_addr.s_addr);   <\/span><br \/>\n    saddr<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> <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aef\u624d\u53ef\u4ee5\u8fd9\u4e48\u5199<\/span><br \/>\n    saddr<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\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/9999\u662f\u4e3b\u673a\u5b57\u8282\u5e8f&#xff0c;\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u7684\u65f6\u5019\u9700\u8981\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f<\/span><br \/>\n    <span class=\"token comment\">\/\/\u56e0\u4e3asaddr\u662fsockaddr_in\u7c7b\u578b\u7684\u6307\u9488&#xff0c;\u6240\u4ee5\u8fd8\u9700\u8981\u8f6c\u6362\u6210sockaddr\u7c7b\u578b\u7684\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<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>saddr<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<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>ret<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/3.\u76d1\u542c<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/4.\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> clientaddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len <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> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<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>clientaddr<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/5.\u8f93\u51fa\u5ba2\u6237\u7aef\u7684\u4fe1\u606f&#xff0c;\u83b7\u53d6\u8fc7\u6765\u7684\u4fe1\u606f\u662f\u7f51\u7edc\u5b57\u8282\u5e8f&#xff0c;\u9700\u8981\u8f6c\u6362\u4e3a\u4e3b\u673a\u5b57\u8282\u5e8f<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> clientIP<span class=\"token punctuation\">[<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>clientaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">,<\/span>clientIP<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>clientIP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> clientPort <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>clientaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client ip is %s,port is %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>clientIP<span class=\"token punctuation\">,<\/span>clientPort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/6.\u8fdb\u884c\u901a\u4fe1&#xff0c;\u5148\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u6570\u636e&#xff0c;\u7136\u540e\u7ed9\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> recvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span>recvBuf<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<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>num<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/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>num<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv client data: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>recvBuf<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>num<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\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;client closed&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello,i am server&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span>data<span class=\"token punctuation\">,<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>cfd<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<h3>3.2 client\u7aef\u4ee3\u7801<\/h3>\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;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;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;stdlib.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><\/p>\n<p>    <span class=\"token comment\">\/\/\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <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>fd<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u8fde\u63a5\u670d\u52a1\u5668<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serveraddr<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    <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>serveraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>fd<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>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 punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <\/p>\n<p>    <span class=\"token comment\">\/\/3.\u901a\u4fe1<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello,i am client&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>data<span class=\"token punctuation\">,<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> recvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>recvBuf<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<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>len<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/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>len<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv server data: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>recvBuf<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>len<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\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;server closed&#8230;&#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>fd<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>\u4e0a\u9762\u7684\u4ee3\u7801\u5c31\u662f\u5b9e\u73b0\u4e86\u4e00\u6b21\u7684\u6536\u53d1\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035112-680863b0a15bc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035112-680863b0c50cb.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u56db\u3001TCP\u4e09\u6b21\u63e1\u624b<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035112-680863b0e9fbc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6211\u4eec\u5148\u770b\u770bTCP\u5934\u90e8\u7ed3\u6784\u4e2d\u7684\u4e00\u4e9b\u91cd\u8981\u6570\u636e\u3002<\/p>\n<p>32 \u4f4d\u5e8f\u53f7(sequence number):\u4e00\u6b21 TCP \u901a\u4fe1(\u4eceTCP \u8fde\u63a5\u5efa\u7acb\u5230\u65ad\u5f00)\u8fc7\u7a0b\u4e2d\u67d0\u4e00\u4e2a\u4f20\u8f93\u65b9\u5411\u4e0a\u7684\u5b57\u8282\u6d41\u7684\u6bcf\u4e2a\u5b57\u8282\u7684\u7f16\u53f7\u3002\u5047\u8bbe\u4e3b\u673aA\u548c\u4e3b\u673a B\u8fdb\u884c TCP \u901a\u4fe1&#xff0c;A\u53d1\u9001\u7ed9 B\u7684\u7b2c\u4e00\u4e2aTCP \u62a5\u6587\u6bb5\u4e2d&#xff0c;\u5e8f\u53f7\u503c\u88ab\u7cfb\u7edf\u521d\u59cb\u5316\u4e3a\u67d0\u4e2a\u968f\u673a\u503cISN(Initial Sequence Number&#xff0c;\u521d\u59cb\u5e8f\u53f7\u503c)\u3002\u90a3\u4e48\u5728\u8be5\u4f20\u8f93\u65b9\u5411\u4e0a(\u4ece A\u5230 B)&#xff0c;\u540e\u7eed\u7684TCP \u62a5\u6587\u6bb5\u4e2d\u5e8f\u53f7\u503c\u5c06\u88ab\u7cfb\u7edf\u8bbe\u7f6e\u6210ISN \u52a0\u4e0a\u8be5\u62a5\u6587\u6bb5\u6240\u643a\u5e26\u6570\u636e\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u5728\u6574\u4e2a\u5b57\u8282\u6d41\u4e2d\u7684\u504f\u79fb\u3002\u4f8b\u5982&#xff0c;\u67d0\u4e2a TCP \u62a5\u6587\u6bb5\u4f20\u9001\u7684\u6570\u636e\u662f\u5b57\u8282\u6d41\u4e2d\u7684\u7b2c 1025~2048 \u5b57\u8282&#xff0c;\u90a3\u4e48\u8be5\u62a5\u6587\u6bb5\u7684\u5e8f\u53f7\u503c\u5c31\u662fISN&#043;1025\u3002\u53e6\u5916\u4e00\u4e2a\u4f20\u8f93\u65b9\u5411(\u4eceB \u5230 A)\u7684 TCP \u62a5\u6587\u6bb5\u7684\u5e8f\u53f7\u503c\u4e5f\u5177\u6709\u76f8\u540c\u7684\u542b\u4e49\u3002<\/p>\n<p>32 \u4f4d\u786e\u8ba4\u53f7(acknowedgement number):\u7528\u4f5c\u5bf9\u53e6\u4e00\u65b9\u53d1\u9001\u6765\u7684TCP \u62a5\u6587\u6bb5\u7684\u54cd\u5e94\u3002\u5176\u503c\u662f\u6536\u5230\u7684 TCP \u62a5\u6587\u6bb5\u7684\u5e8f\u53f7\u503c&#043;\u6807\u5fd7\u4f4d\u957f\u5ea6(SYN&#xff0c;FIN)&#043;\u6570\u636e\u957f\u5ea6\u3002\u5047\u8bbe\u4e3b\u673aA\u548c\u4e3b\u673aB\u8fdb\u884cTCP \u901a\u4fe1&#xff0c;\u90a3\u4e48 A\u53d1\u9001\u51fa\u7684TCP \u62a5\u6587\u6bb5\u4e0d\u4ec5\u643a\u5e26\u81ea\u5df1\u7684\u5e8f\u53f7&#xff0c;\u800c\u4e14\u5305\u542b\u5bf9B\u53d1\u9001\u6765\u7684 TCP \u62a5\u6587\u6bb5\u7684\u786e\u8ba4\u53f7\u3002\u53cd\u4e4b&#xff0c;B\u53d1\u9001\u51fa\u7684 TCP \u62a5\u6587\u6bb5\u4e5f\u540c\u6837\u643a\u5e26\u81ea\u5df1\u7684\u5e8f\u53f7\u548c\u5bf9A\u53d1\u9001\u6765\u7684\u62a5\u6587\u6bb5\u7684\u786e\u8ba4\u5e8f\u53f7\u3002<\/p>\n<p>\u5934\u90e8\u957f\u5ea6\u8fd9\u4e2a\u5b57\u6bb5\u662f4\u4e2a\u5b57\u8282\u4e3a\u5355\u4f4d\u7684&#xff0c;4\u4f4d\u6700\u5927\u80fd\u591f\u8868\u793a15&#xff0c;\u6240\u4ee5TCP\u5934\u90e8\u7684\u957f\u5ea6\u6700\u957f\u662f60\u5b57\u8282\u3002<\/p>\n<p>6\u4f4d\u7684\u6807\u5fd7\u4f4d\u4e2d\u6700\u91cd\u8981\u7684\u51e0\u4e2a\u5206\u522b\u662fACK\u3001SYN\u3001FIN\u3002 ACK \u6807\u5fd7&#xff0c;\u8868\u793a\u786e\u8ba4\u53f7\u662f\u5426\u6709\u6548\u3002\u6211\u4eec\u79f0\u643a\u5e26 ACK \u6807\u5fd7\u7684 TCP \u62a5\u6587\u6bb5\u4e3a\u786e\u8ba4\u62a5\u6587\u6bb5\u3002 SYN \u6807\u5fd7&#xff0c;\u8868\u793a\u8bf7\u6c42\u5efa\u7acb\u4e00\u4e2a\u8fde\u63a5\u3002\u6211\u4eec\u79f0\u643a\u5e26 SYN \u6807\u5fd7\u7684 TCP \u62a5\u6587\u6bb5\u4e3a\u540c\u6b65\u62a5\u6587\u6bb5\u3002 FIN \u6807\u5fd7&#xff0c;\u8868\u793a\u901a\u77e5\u5bf9\u65b9\u672c\u7aef\u8981\u5173\u95ed\u8fde\u63a5\u4e86\u3002\u6211\u4eec\u79f0\u643a\u5e26 FIN \u6807\u5fd7\u7684 TCP \u62a5\u6587\u6bb5\u4e3a\u7ed3\u675f\u62a5\u6587 \u6bb5\u3002<\/p>\n<p>\u4e09\u6b21\u63e1\u624b\u53d1\u751f\u5728\u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u65f6\u5019&#xff0c; \u5f53\u8c03\u7528connect\u7684\u65f6\u5019&#xff0c;\u5e95\u5c42\u4f1a\u901a\u8fc7TCP\u534f\u8bae\u8fdb\u884c\u4e09\u6b21\u63e1\u624b\u3002<\/p>\n<p>\u4e24\u6b21\u63e1\u624b\u662f\u4e0d\u884c\u7684&#xff0c;\u901a\u4fe1\u53cc\u65b9\u5404\u81ea\u90fd\u8981\u786e\u8ba4\u81ea\u5df1\u662f\u80fd\u6536\u53d1\u6570\u636e\u7684\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u7b2c\u4e00\u6b21\u53d1\u7684\u65f6\u5019&#xff0c;\u53ea\u786e\u8ba4\u4e86\u81ea\u5df1\u80fd\u591f\u53d1\u3002<\/p>\n<p>\u670d\u52a1\u7aef\u6536\u5230\u7b2c\u4e00\u6b21\u6570\u636e\u4e4b\u540e&#xff0c;\u80fd\u591f\u786e\u8ba4\u81ea\u5df1\u7684\u6536\u548c\u5ba2\u6237\u7aef\u7684\u53d1\u662f\u6ca1\u95ee\u9898\u7684&#xff0c;\u7136\u540e\u670d\u52a1\u7aef\u53d1\u9001ACK\u786e\u8ba4&#xff0c;\u8fdb\u4e00\u6b65\u53c8\u786e\u8ba4\u4e86\u670d\u52a1\u7aef\u81ea\u5df1\u7684\u53d1\u662f\u6ca1\u95ee\u9898\u7684\u3002&#xff08;\u6b64\u65f6\u670d\u52a1\u7aef\u80fd\u591f\u786e\u8ba4\u81ea\u5df1\u80fd\u591f\u6536\u53d1&#xff0c;\u5e76\u4e14\u5ba2\u6237\u7aef\u80fd\u591f\u53d1\u3002&#xff09;<\/p>\n<p>\u7136\u540e\u5ba2\u6237\u7aef\u6536\u5230\u4e86\u4e4b\u540e&#xff0c;\u80fd\u591f\u786e\u8ba4\u670d\u52a1\u7aef\u80fd\u591f\u8fdb\u884c\u6536\u3001\u53d1\u7684&#xff0c;\u5e76\u4e14\u786e\u8ba4\u4e86\u81ea\u5df1\u80fd\u591f\u6ca1\u95ee\u9898\u7684\u6536\u53d1\u3002&#xff08;\u6b64\u65f6\u53ea\u5dee\u670d\u52a1\u7aef\u80fd\u591f\u786e\u8ba4\u5ba2\u6237\u7aef\u80fd\u591f\u6b63\u5e38\u6536\u5230\u81ea\u5df1\u6240\u53d1\u9001\u7684\u6570\u636e&#xff0c;\u6240\u4ee5\u8fd8\u5dee\u4e00\u6b21\u5ba2\u6237\u7aef\u53d1\u9001&#xff0c;\u4e5f\u5c31\u662f\u6700\u540e\u4e00\u6b21\u63e1\u624b\u3002&#xff09;<\/p>\n<p>\u7136\u540e\u6700\u540e\u5ba2\u6237\u7aef\u4f1a\u518d\u53d1\u4e00\u6b21\u7ed9\u670d\u52a1\u7aef&#xff0c;\u670d\u52a1\u7aef\u6536\u5230\u4e4b\u540e&#xff0c;\u80fd\u591f\u6e05\u695a\u5ba2\u6237\u7aef\u662f\u80fd\u591f\u6b63\u5e38\u6536\u7684\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035113-680863b136d3a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035113-680863b18091f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u7b2c\u4e00\u6b21\u63e1\u624b&#xff1a; 1.\u5ba2\u6237\u7aef\u5c06SYN\u6807\u5fd7\u4f4d\u7f6e\u4e3a1 2.\u751f\u6210\u4e00\u4e2a\u968f\u673a\u768432\u4f4d\u7684\u5e8f\u53f7seq&#061;J &#xff0c; \u8fd9\u4e2a\u5e8f\u53f7\u540e\u8fb9\u662f\u53ef\u4ee5\u643a\u5e26\u6570\u636e&#xff08;\u6570\u636e\u7684\u5927\u5c0f&#xff09;<\/p>\n<p>\u7b2c\u4e8c\u6b21\u63e1\u624b&#xff1a; 1.\u670d\u52a1\u5668\u7aef\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8fde\u63a5&#xff1a; ACK&#061;1 2.\u670d\u52a1\u5668\u4f1a\u56de\u53d1\u4e00\u4e2a\u786e\u8ba4\u5e8f\u53f7&#xff1a; ack&#061;\u5ba2\u6237\u7aef\u7684\u5e8f\u53f7 &#043; 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src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035113-680863b1c1d37.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e94\u3001TCP\u6ed1\u52a8\u7a97\u53e3<\/h2>\n<p>\u6ed1\u52a8\u7a97\u53e3(Sliding window)\u662f\u4e00\u79cd\u6d41\u91cf\u63a7\u5236\u6280\u672f\u3002\u65e9\u671f\u7684\u7f51\u7edc\u901a\u4fe1\u4e2d&#xff0c;\u901a\u4fe1\u53cc\u65b9\u4e0d\u4f1a\u8003\u8651\u7f51\u7edc\u7684\u62e5\u6324\u60c5\u51b5\u76f4\u63a5\u53d1\u9001\u6570\u636e\u3002\u7531\u4e8e\u5927\u5bb6\u4e0d\u77e5\u9053\u7f51\u7edc\u62e5\u585e\u72b6\u51b5&#xff0c;\u540c\u65f6\u53d1\u9001\u6570\u636e&#xff0c;\u5bfc\u81f4\u4e2d\u95f4\u8282\u70b9\u963b\u585e\u6389\u5305&#xff0c;\u8c01\u4e5f\u53d1\u4e0d\u4e86\u6570\u636e&#xff0c;\u6240\u4ee5\u5c31\u6709\u4e86\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\u6765\u89e3\u51b3\u6b64\u95ee\u9898\u3002<\/p>\n<p>\u6ed1\u52a8\u7a97\u53e3\u534f\u8bae\u662f\u7528\u6765\u6539\u5584\u541e\u5410\u91cf\u7684\u4e00\u79cd\u6280\u672f&#xff0c;\u5373\u5bb9\u8bb8\u53d1\u9001\u65b9\u5728\u63a5\u6536\u4efb\u4f55\u5e94\u7b54\u4e4b\u524d\u4f20\u9001\u9644\u52a0\u7684\u5305\u3002\u63a5\u6536\u65b9\u544a\u8bc9\u53d1\u9001\u65b9\u5728\u67d0\u4e00\u65f6\u523b\u80fd\u9001\u591a\u5c11\u5305(\u79f0\u7a97\u53e3\u5c3a\u5bf8)\u3002TCP 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\/><\/p>\n<p>\u7a97\u53e3\u53ef\u4ee5\u7406\u89e3\u4e3a\u7f13\u51b2\u533a\u7684\u5927\u5c0f&#xff0c;\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u4f1a\u968f\u7740\u53d1\u9001\u6570\u636e\u548c\u63a5\u6536\u6570\u636e\u800c\u53d8\u5316\u3002\u901a\u4fe1\u7684\u53cc\u65b9\u90fd\u6709\u53d1\u9001\u7f13\u51b2\u533a\u548c\u63a5\u6536\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/p>\n<p>\u4e0b\u56fe\u4e2d\u7684\u4e00\u4e9b\u6570\u636e\u8bf4\u660e&#xff0c;mssMaximum Segment Size&#xff0c;\u4e00\u6761\u6570\u636e\u7684\u6700\u5927\u6570\u636e\u91cf\u3002win&#xff1a;Windows&#xff0c;\u6ed1\u52a8\u7a97\u53e3\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035114-680863b24e9ca.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u516d\u3001TCP\u56db\u6b21\u6325\u624b<\/h2>\n<p>\u56db\u6b21\u6325\u624b\u53d1\u751f\u5728\u65ad\u5f00\u8fde\u63a5\u7684\u65f6\u5019&#xff0c;\u5728\u7a0b\u5e8f\u5f53\u4e2d\u8c03\u7528\u4e86close()\u4f7f\u7528TCP\u534f\u8bae\u8fdb\u884c\u56db\u6b21\u6325\u624b\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u53ef\u4ee5\u4e3b\u52a8\u53d1\u8d77\u65ad\u5f00\u8fde\u63a5&#xff0c;\u8c01\u5148\u8c03\u7528close\u8c01\u5c31\u662f\u53d1\u8d77\u8005\u3002<\/p>\n<p>\u56e0\u4e3a\u8fde\u63a5\u662f\u53cc\u5411\u7684&#xff0c;\u6240\u4ee5 \u65ad\u5f00\u7684\u65f6\u5019\u4e5f\u9700\u8981\u53cc\u5411\u65ad\u5f00\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035114-680863b2b3305.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e03\u3001\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n<p>\u5728main\u51fd\u6570\u4e2d&#xff0c;\u7a0b\u5e8f\u9996\u5148\u901a\u8fc7sigaction\u7cfb\u7edf\u8c03\u7528\u6ce8\u518c\u4e86SIGCHLD\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570&#xff0c;\u786e\u4fdd\u80fd\u591f\u53ca\u65f6\u56de\u6536\u5b50\u8fdb\u7a0b\u3002\u63a5\u7740&#xff0c;\u7a0b\u5e8f\u521b\u5efa\u4e86\u4e00\u4e2aTCP\u5957\u63a5\u5b57&#xff0c;\u5e76\u5c06\u5176\u7ed1\u5b9a\u5230\u672c\u5730\u76849999\u7aef\u53e3\u4e0a&#xff0c;\u7136\u540e\u8fdb\u5165\u76d1\u542c\u72b6\u6001&#xff0c;\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42\u3002\u4e00\u65e6\u6709\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u670d\u52a1\u5668\u4f1a\u901a\u8fc7accept\u51fd\u6570\u63a5\u53d7\u8fde\u63a5&#xff0c;\u5e76\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u6765\u5904\u7406\u4e0e\u8be5\u5ba2\u6237\u7aef\u7684\u901a\u4fe1\u3002\u5b50\u8fdb\u7a0b\u4f1a\u83b7\u53d6\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u5e76\u901a\u8fc7\u5faa\u73af\u4e0d\u65ad\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e&#xff0c;\u7136\u540e\u5c06\u63a5\u6536\u5230\u7684\u6570\u636e\u539f\u6837\u53d1\u9001\u56de\u5ba2\u6237\u7aef&#xff0c;\u76f4\u5230\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\u3002\u5b50\u8fdb\u7a0b\u5728\u5904\u7406\u5b8c\u5ba2\u6237\u7aef\u8bf7\u6c42\u540e\u4f1a\u9000\u51fa\u3002\u7236\u8fdb\u7a0b\u5219\u7ee7\u7eed\u7b49\u5f85\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<p>\u4fe1\u53f7\u5904\u7406\u51fd\u6570recyleChild&#xff0c;\u7528\u4e8e\u56de\u6536\u5b50\u8fdb\u7a0b&#xff0c;\u9632\u6b62\u50f5\u5c38\u8fdb\u7a0b\u7684\u4ea7\u751f\u3002\u5f53\u6536\u5230SIGCHLD\u4fe1\u53f7\u65f6&#xff0c;\u8be5\u51fd\u6570\u4f1a\u8c03\u7528waitpid\u51fd\u6570\u4ee5\u975e\u963b\u585e\u7684\u65b9\u5f0f\u56de\u6536\u6240\u6709\u5df2\u7ecf\u7ed3\u675f\u7684\u5b50\u8fdb\u7a0b&#xff0c;\u5e76\u6253\u5370\u88ab\u56de\u6536\u5b50\u8fdb\u7a0b\u7684PID\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;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;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;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;signal.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;wait.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><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">recyleChild<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> arg<span class=\"token punctuation\">)<\/span> <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 keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">waitpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> WNOHANG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6240\u6709\u7684\u5b50\u8fdb\u7a0b\u90fd\u56de\u6536\u4e86<\/span><br \/>\n            <span class=\"token keyword\">break<\/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>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8fd8\u6709\u5b50\u8fdb\u7a0b\u6d3b\u7740<\/span><br \/>\n            <span class=\"token keyword\">break<\/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>ret <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u88ab\u56de\u6536\u4e86<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u88ab\u56de\u6536\u4e86\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ret<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 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><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sigaction<\/span> act<span class=\"token punctuation\">;<\/span><br \/>\n    act<span class=\"token punctuation\">.<\/span>sa_flags <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sigemptyset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">.<\/span>sa_mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    act<span class=\"token punctuation\">.<\/span>sa_handler <span class=\"token operator\">&#061;<\/span> recyleChild<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ce8\u518c\u4fe1\u53f7\u6355\u6349<\/span><br \/>\n    <span class=\"token function\">sigaction<\/span><span class=\"token punctuation\">(<\/span>SIGCHLD<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>PF_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>lfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> saddr<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<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\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    saddr<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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<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>saddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<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>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u76d1\u542c<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4e0d\u65ad\u5faa\u73af\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5<\/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><\/p>\n<p>        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<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>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6bcf\u4e00\u4e2a\u8fde\u63a5\u8fdb\u6765&#xff0c;\u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u8ddf\u5ba2\u6237\u7aef\u901a\u4fe1<\/span><br \/>\n        pid_t pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u4fe1\u606f<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> cliIp<span class=\"token punctuation\">[<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliIp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> cliPort <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client ip is : %s, port is %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> cliPort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> recvBuf<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\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/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>len <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv client : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<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>len <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;client closed&#8230;.\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8fd9\u4e2abreak\u4e5f\u662f\u6709\u4f5c\u7528\u7684&#xff0c;\u5982\u679c\u4e0dbreak\u5c31\u4f1a\u8f93\u51fa\u4e24\u6b21close&#xff0c;\u56e0\u4e3a\u4f1a\u7ee7\u7eed\u5230write&#xff0c;\u7136\u540e\u5230\u5faa\u73af&#xff0c;\u7136\u540e\u53c8\u5224\u4e00\u6b21close<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>cfd<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>    <span class=\"token comment\">\/\/ \u9000\u51fa\u5f53\u524d\u5b50\u8fdb\u7a0b<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<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>\u8fd9\u91cc\u7b80\u5355\u56de\u987e\u4e0b\u4fe1\u53f7\u96c6\u7684\u77e5\u8bc6\u70b9\u3002\u4e4b\u6240\u4ee5\u4e0d\u4f7f\u7528wait\u662f\u56e0\u4e3a\u4f1a\u963b\u585e\u3002<\/p>\n<p>    <span class=\"token comment\">\/\/SIGCHLD\u4fe1\u53f7\u662f\u5728\u5b50\u8fdb\u7a0b\u7ed3\u675f\u65f6\u7531\u64cd\u4f5c\u7cfb\u7edf\u53d1\u9001\u7ed9\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/sigaction\u662fPOSIX\u6807\u51c6\u4e2d\u7528\u4e8e\u4fe1\u53f7\u5904\u7406\u7684\u7ed3\u6784\u4f53<\/span><br \/>\n    <span class=\"token comment\">\/\/sa_flags\u662f\u4e00\u4e2a\u6807\u5fd7\u4f4d&#xff0c;\u7528\u4e8e\u63a7\u5236\u4fe1\u53f7\u5904\u7406\u7684\u7279\u6b8a\u884c\u4e3a\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5c06\u5b83\u8bbe\u7f6e\u4e3a0\u8868\u793a\u4e0d\u542f\u7528\u4efb\u4f55\u7279\u6b8a\u884c\u4e3a&#xff0c;\u5373\u4f7f\u7528\u9ed8\u8ba4\u7684\u4fe1\u53f7\u5904\u7406\u65b9\u5f0f\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/\u8c03\u7528\u4e86sigemptyset\u51fd\u6570&#xff0c;\u7528\u4e8e\u521d\u59cb\u5316act.sa_mask.<\/span><br \/>\n    <span class=\"token comment\">\/\/sa_mask\u662f\u4e00\u4e2a\u4fe1\u53f7\u96c6&#xff0c;\u7528\u4e8e\u6307\u5b9a\u5728\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u6267\u884c\u671f\u95f4\u9700\u8981\u5c4f\u853d\u7684\u4fe1\u53f7\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/sigemptyset\u51fd\u6570\u7684\u4f5c\u7528\u662f\u6e05\u7a7a\u4fe1\u53f7\u96c6&#xff0c;\u5373\u4e0d\u5c4f\u853d\u4efb\u4f55\u4fe1\u53f7\u3002<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sigaction<\/span> act<span class=\"token punctuation\">;<\/span><br \/>\n    act<span class=\"token punctuation\">.<\/span>sa_flags <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sigemptyset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">.<\/span>sa_mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    act<span class=\"token punctuation\">.<\/span>sa_handler <span class=\"token operator\">&#061;<\/span> recyleChild<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ce8\u518c\u4fe1\u53f7\u6355\u6349<\/span><br \/>\n    <span class=\"token function\">sigaction<\/span><span class=\"token punctuation\">(<\/span>SIGCHLD<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5ba2\u6237\u7aef\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token comment\">\/\/ TCP\u901a\u4fe1\u7684\u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;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;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;stdlib.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><\/p>\n<p>    <span class=\"token comment\">\/\/ 1.\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <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>fd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2.\u8fde\u63a5\u670d\u52a1\u5668\u7aef<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serveraddr<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    <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>serveraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>fd<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>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 punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u901a\u4fe1<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> recvBuf<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> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><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><\/p>\n<p>        <span class=\"token function\">sprintf<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;data : %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7ed9\u670d\u52a1\u5668\u7aef\u53d1\u9001\u6570\u636e<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8fd9\u91cc&#043;1 \u662f\u56e0\u4e3a\u8981\u7b97\u8fdb\u53bb\u5b57\u7b26\u6362\u884c\u7684\u7ed3\u675f\u7b26&#xff0c;\u4e0d\u7136\u4f1a\u6709\u95ee\u9898\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/\u670d\u52a1\u5668\u7aefwrite\u4e5f\u662f\u540c\u7406\u7684\u3002<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<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>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/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>len <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv server : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<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>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8868\u793a\u670d\u52a1\u5668\u7aef\u65ad\u5f00\u8fde\u63a5<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;server closed&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5173\u95ed\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<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>\u8fd9\u91cc\u6709\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\u662f&#xff0c;\u5728strlen(recvBuf)\u540e\u9762\u8fdb\u884c\u4e86&#043;1\u7684\u64cd\u4f5c\u3002\u5728\u5904\u7406\u5b57\u7b26\u4e32\u65f6&#xff0c;strlen\u51fd\u6570\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u957f\u5ea6&#xff0c;\u4f46\u4e0d\u5305\u62ec\u5b57\u7b26\u4e32\u672b\u5c3e\u7684\u7a7a\u5b57\u7b26&#xff08;\u2018\\\\0\u2019&#xff09;\u3002\u7136\u800c&#xff0c;C\u8bed\u8a00\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u4ee5\u7a7a\u5b57\u7b26\u7ed3\u5c3e\u7684&#xff0c;\u56e0\u6b64\u5728\u5c06\u5b57\u7b26\u4e32\u5199\u5165\u5957\u63a5\u5b57\u65f6&#xff0c;\u5982\u679c\u9700\u8981\u5c06\u6574\u4e2a\u5b57\u7b26\u4e32&#xff08;\u5305\u62ec\u7a7a\u5b57\u7b26&#xff09;\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u5c31\u9700\u8981\u5728strlen\u8fd4\u56de\u7684\u957f\u5ea6\u57fa\u7840\u4e0a\u52a01\u3002<\/p>\n<p>\u53e6\u5916\u8fd8\u6709\u4e00\u4e2a\u70b9\u9700\u8981\u6ce8\u610f&#xff0c;\u670d\u52a1\u7aef\u4e2d\u7684\u4ee3\u7801&#xff1a;<\/p>\n<p>\u5f53\u67d0\u4e2a\u5b50\u8fdb\u7a0b\u9000\u51fa\u7684\u65f6\u5019&#xff0c;\u4f1a\u4ea7\u751f\u4fe1\u53f7&#xff0c;\u7136\u540e\u6267\u884c\u56de\u8c03&#xff0c;\u6267\u884c\u56de\u8c03\u5c31\u76f8\u5f53\u4e8e\u4e00\u4e2a\u8f6f\u4e2d\u65ad&#xff0c;\u8f6f\u7ec8\u7aef\u4f1a\u4ea7\u751f\u4e00\u4e2a\u9519\u8befEINTR&#xff0c;\u6267\u884c\u5b8c\u4e2d\u65ad\u4e4b\u540e\u4f1a\u56de\u5230accpet&#xff0c;\u7136\u540e\u7ee7\u7eed\u6267\u884caccpet&#xff0c;\u4f46\u662f\u8fd9\u4e2a\u65f6\u5019\u4f1a\u6267\u884c\u4e0d\u4e86&#xff0c;\u4f1a\u51fa\u9519&#xff0c;\u4f1a\u8fd4\u56de-01&#xff0c;\u7136\u540e\u5bfc\u81f4\u9000\u51fa\u8fdb\u7a0b\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4&#xff0c;accept\u662f\u4e00\u4e2a\u963b\u585e\u7cfb\u7edf\u8c03\u7528&#xff0c;\u7528\u4e8e\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42\u3002\u5f53\u7236\u8fdb\u7a0b\u6b63\u5728\u6267\u884caccept\u65f6&#xff0c;\u5982\u679c\u5b50\u8fdb\u7a0b\u9000\u51fa&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u53d1\u9001SIGCHLD\u4fe1\u53f7\u7ed9\u7236\u8fdb\u7a0b\u3002\u7236\u8fdb\u7a0b\u63a5\u6536\u5230SIGCHLD\u4fe1\u53f7\u540e&#xff0c;\u4f1a\u4e2d\u65ad\u5f53\u524d\u7684accept\u8c03\u7528&#xff0c;\u5e76\u6267\u884c\u4fe1\u53f7\u5904\u7406\u51fd\u6570recyleChild\u3002\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e&#xff0c;accept\u8c03\u7528\u4f1a\u8fd4\u56de-1&#xff0c;\u5e76\u5c06errno\u8bbe\u7f6e\u4e3aEINTR&#xff0c;\u8868\u793a\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad\u4e86\u3002<\/p>\n<p>\u6240\u4ee5\u9700\u8981\u6539\u8fdb\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n<p>        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<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>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6539\u8fdb\u540e\u7684\u4ee3\u7801\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<p>        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<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>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250423035115-680863b303c62.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 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