{"id":102290,"date":"2026-09-08T11:13:53","date_gmt":"2026-09-08T03:13:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/102290.html"},"modified":"2026-09-08T11:13:53","modified_gmt":"2026-09-08T03:13:53","slug":"linux%e7%bd%91%e7%bb%9c%ef%bc%88%e4%ba%94%ef%bc%89%ef%bc%9a%e4%b8%80%e6%96%87%e5%90%83%e9%80%8f-udp-socket-%e7%bc%96%e7%a8%8b%ef%bc%9a%e4%bb%8e-socket%e3%80%81bind-%e5%88%b0%e6%95%b0%e6%8d%ae%e6%94%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/102290.html","title":{"rendered":"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260908031351-6a9f7d6f8fc4f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" width=\"200\" \/><\/p>\n<p> <b> \u25c6 \u535a\u4e3b\u540d\u79f0&#xff1a; \u5c0f\u6b64\u65b9-CSDN\u535a\u5ba2 <\/b><\/p>\n<p>   \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u5c0f\u6b64\u65b9\u7684\u535a\u5ba2\u3002 <\/p>\n<p>    \u2b50\ufe0f\u7f51\u7edc\u7cfb\u5217\u4e2a\u4eba\u4e13\u680f&#xff1a;<br \/>\n    \u3010\u4e3b\u9898\u66f2\u3011\u8ba1\u7b97\u673a\u7f51\u7edc <\/p>\n<p>  \u2b50\ufe0f\u6b64\u65b9\u7684GitHub&#xff1a;<br \/>\n  github_\u6b64\u65b9  <\/p>\n<p> \u2b50\ufe0f<br \/>\n <b>\u6211\u4eec\u601d\u8003 (Rethink) \u00b7 \u6211\u4eec\u91cd\u5efa (Rebuild) \u00b7 \u6211\u4eec\u8bb0\u5f55 (Record) <\/b><\/p>\n<hr \/>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u6982\u8981&amp;\u5e8f\u8ad6<\/li>\n<li>\u4e00\u3001UDP \u5957\u63a5\u5b57\u7f16\u7a0b\u57fa\u7840\u4e0e\u6838\u5fc3 API \u8be6\u89e3<\/li>\n<li>\n<ul>\n<li>1.1 \u5957\u63a5\u5b57\u57fa\u7840\u6982\u5ff5\u4e0e\u5e38\u7528\u5934\u6587\u4ef6<\/li>\n<li>1.2 \u521b\u5efa\u5957\u63a5\u5b57&#xff1a;socket \u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.2.1 \u53c2\u6570\u89e3\u6790\u4e0e\u5e38\u6570\u5b9a\u4e49<\/li>\n<li>1.2.2 \u8fd4\u56de\u503c\u4e0e\u201c\u7f51\u7edc\u7686\u6587\u4ef6\u201d\u54f2\u5b66<\/li>\n<\/ul>\n<\/li>\n<li>1.3 \u5730\u5740\u7ed3\u6784\u4f53\u8be6\u89e3&#xff1a;sockaddr_in<\/li>\n<li>\n<ul>\n<li>1.3.1 sockaddr_in \u7ed3\u6784\u4f53\u6210\u5458\u5b9a\u4e49<\/li>\n<\/ul>\n<\/li>\n<li>1.4 IP \u5730\u5740\u8f6c\u6362\u4e0e\u5b57\u8282\u5e8f\u5904\u7406<\/li>\n<li>\n<ul>\n<li>1.4.1 \u70b9\u5206\u5341\u8fdb\u5236\u4e0e\u7f51\u7edc\u5b57\u8282\u5e8f\u6574\u6570\u8f6c\u6362<\/li>\n<\/ul>\n<\/li>\n<li>1.5 \u6570\u636e\u63a5\u6536\u4e0e\u54cd\u5e94\u5904\u7406&#xff1a;recvfrom \u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.5.1 recvfrom \u53c2\u6570\u4e0e\u8fd4\u56de\u503c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001UDP \u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u6838\u5fc3\u901a\u4fe1\u6d41\u7a0b\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>2.1 \u670d\u52a1\u5668\u5957\u63a5\u5b57\u521d\u59cb\u5316\u4e0e\u5730\u5740\u7ed1\u5b9a<\/li>\n<li>\n<ul>\n<li>2.1.1 \u7ed3\u6784\u4f53\u6e05\u96f6&#xff1a;bzero \u4e0e explicit_bzero<\/li>\n<li>2.1.2 \u586b\u5145 sockaddr_in \u4e0e\u7f51\u7edc\u5b57\u8282\u5e8f\u8f6c\u6362<\/li>\n<li>2.1.3 \u7ed1\u5b9a\u7cfb\u7edf\u8c03\u7528&#xff1a;bind \u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>2.2 UDP \u5168\u53cc\u5de5\u901a\u4fe1\u4e0e\u6570\u636e\u6536\u53d1\u673a\u5236<\/li>\n<li>\n<ul>\n<li>2.2.1 \u6570\u636e\u63a5\u6536\u673a\u5236&#xff1a;recvfrom \u4e0e\u963b\u585e IO<\/li>\n<li>\n<ul>\n<li>\u963b\u585e IO \u884c\u4e3a\u7279\u5f81<\/li>\n<li>\u591a\u5bf9\u4e00\u901a\u4fe1\u4e0e\u5bf9\u7aef\u5957\u63a5\u5b57\u83b7\u53d6<\/li>\n<\/ul>\n<\/li>\n<li>2.2.2 \u6570\u636e\u53d1\u9001\u673a\u5236&#xff1a;sendto \u51fd\u6570<\/li>\n<li>\n<ul>\n<li>\u53c2\u6570\u8be6\u89e3<\/li>\n<li>\u8fd4\u56de\u503c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>2.3 \u5ba2\u6237\u7aef\u8bbf\u95ee\u673a\u5236\u4e0e\u7aef\u53e3\u5904\u7406<\/li>\n<li>\n<ul>\n<li>2.3.1 \u670d\u52a1\u7aef\u5730\u5740\u7684\u201c\u786c\u7f16\u7801\u201d\u4e0e\u914d\u7f6e\u6587\u4ef6<\/li>\n<li>2.3.2 \u5ba2\u6237\u7aef\u7684\u9690\u5f0f Bind<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001Client \u7aef\u7684 Bind \u7b56\u7565\u4e0e Server \u7aef\u7684 Bind \u5fc5\u8981\u6027\u6df1\u5ea6\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>3.1 \u5ba2\u6237\u7aef\u8981\u4e0d\u8981 bind&#xff1f;<\/li>\n<li>3.2 \u4e3a\u4ec0\u4e48\u670d\u52a1\u7aef\u5fc5\u987b\u663e\u5f0f bind&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u670d\u52a1\u5668 IP \u7ed1\u5b9a\u9677\u9631\u3001INADDR_ANY \u539f\u7406\u4e0e\u8f6c\u6362\u51fd\u6570\u6f14\u8fdb<\/li>\n<li>\n<ul>\n<li>4.1 \u670d\u52a1\u5668 IP \u7ed1\u5b9a\u7684\u201c\u5751\u201d\u4e0e INADDR_ANY \u539f\u7406<\/li>\n<li>\n<ul>\n<li>4.1.1 \u5e38\u89c1\u7684\u7ed1\u5b9a\u8bef\u533a<\/li>\n<li>4.1.2 \u6700\u4f73\u5b9e\u8df5&#xff1a;\u4f7f\u7528 INADDR_ANY&#xff08;\u4efb\u610f\u5730\u5740\u7ed1\u5b9a&#xff09;<\/li>\n<li>\n<ul>\n<li>INADDR_ANY \u7684\u4f18\u52bf\u4e0e\u5e95\u5c42\u539f\u7406<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>4.2 \u8f6f\u4ef6\u5206\u5c42\u8bbe\u8ba1&#xff1a;UDP \u670d\u52a1\u4e0e\u4e1a\u52a1\u903b\u8f91\u89e3\u8026<\/li>\n<li>\n<ul>\n<li>4.2.1 \u67b6\u6784\u8bbe\u8ba1\u601d\u60f3<\/li>\n<li>4.2.2 \u56de\u8c03\u51fd\u6570\u6a21\u5f0f\u5b9e\u73b0<\/li>\n<\/ul>\n<\/li>\n<li>4.3 \u5730\u5740\u8f6c\u6362\u51fd\u6570\u7684\u6f14\u8fdb\u4e0e\u7ebf\u7a0b\u5b89\u5168\u6027\u5206\u6790<\/li>\n<li>\n<ul>\n<li>4.3.1 \u65e7\u7248 API \u53ca\u5176\u7f3a\u9677<\/li>\n<li>\n<ul>\n<li>1. inet_addr<\/li>\n<li>2. inet_ntoa \u4e0e\u7ebf\u7a0b\u5b89\u5168\u9690\u60a3<\/li>\n<\/ul>\n<\/li>\n<li>4.3.2 \u73b0\u4ee3\u5316\u7ebf\u7a0b\u5b89\u5168 API&#xff1a;inet_pton \u4e0e inet_ntop<\/li>\n<li>\n<ul>\n<li>API \u63a5\u53e3\u58f0\u660e<\/li>\n<li>\u5c01\u88c5\u73b0\u4ee3 IP \u5730\u5740\u8f6c\u6362\u7c7b\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u9644\u4e0a\u6e90\u7801<\/li>\n<\/ul>\n<hr \/>\n<h2>\u6982\u8981&amp;\u5e8f\u8ad6<\/h2>\n<p>\u2003\u2003Hello\u5927\u5bb6\u597d&#xff0c;\u6211\u662f\u6b64\u65b9&#xff0c;\u672c\u6587\u4ece UDP Socket \u57fa\u7840\u51fa\u53d1&#xff0c;\u4f9d\u6b21\u8bb2\u89e3 socket\u3001sockaddr_in\u3001\u5b57\u8282\u5e8f\u3001recvfrom\/sendto\u3001\u670d\u52a1\u7aef bind\u3001\u5ba2\u6237\u7aef\u9690\u5f0f bind\u3001INADDR_ANY&#xff0c;\u4ee5\u53ca IP \u5730\u5740\u8f6c\u6362\u4e0e\u7ebf\u7a0b\u5b89\u5168 API\u3002<\/p>\n<h2>\u4e00\u3001UDP \u5957\u63a5\u5b57\u7f16\u7a0b\u57fa\u7840\u4e0e\u6838\u5fc3 API \u8be6\u89e3<\/h2>\n<p>\u2003\u2003\u7f51\u7edc\u7f16\u7a0b\u7684\u6838\u5fc3\u5728\u4e8e\u901a\u8fc7\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u5957\u63a5\u5b57&#xff08;Socket&#xff09;\u63a5\u53e3\u5b9e\u73b0\u8de8\u8fdb\u7a0b\u6216\u8de8\u4e3b\u673a\u7684\u6570\u636e\u901a\u4fe1\u3002\u5728\u4f20\u8f93\u5c42\u534f\u8bae\u4e2d&#xff0c;UDP&#xff08;\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae&#xff09;\u662f\u4e00\u79cd\u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u7684\u9762\u5411\u6570\u636e\u62a5\u7684\u4f20\u8f93\u534f\u8bae\u3002<\/p>\n<h3>1.1 \u5957\u63a5\u5b57\u57fa\u7840\u6982\u5ff5\u4e0e\u5e38\u7528\u5934\u6587\u4ef6<\/h3>\n<p>\u2003\u2003\u5728 Linux \u7f51\u7edc\u7f16\u7a0b\u4e2d&#xff0c;\u8fdb\u884c\u7f51\u7edc\u5957\u63a5\u5b57\u5f00\u53d1\u901a\u5e38\u9700\u8981\u5f15\u5165\u4ee5\u4e0b\u56db\u4e2a\u57fa\u7840\u5934\u6587\u4ef6&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/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><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;netinet\/in.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><\/p>\n<ul>\n<li>sys\/types.h \u4e0e sys\/socket.h&#xff1a;\u5b9a\u4e49\u4e86\u5957\u63a5\u5b57\u7f16\u7a0b\u7684\u6838\u5fc3\u6570\u636e\u7c7b\u578b\u4e0e\u7cfb\u7edf\u8c03\u7528\u51fd\u6570&#xff0c;\u5982 socket()\u3001recvfrom()\u3001sendto() \u7b49\u3002<\/li>\n<li>netinet\/in.h \u4e0e arpa\/inet.h&#xff1a;\u5b9a\u4e49\u4e86\u7f51\u7edc\u5730\u5740\u7ed3\u6784\u4f53&#xff08;\u5982 struct sockaddr_in&#xff09;\u4ee5\u53ca IP \u5730\u5740\u4e0e\u5b57\u8282\u5e8f\u8f6c\u6362\u7684\u51fd\u6570\u3002<\/li>\n<\/ul>\n<h3>1.2 \u521b\u5efa\u5957\u63a5\u5b57&#xff1a;socket \u51fd\u6570<\/h3>\n<p>\u2003\u2003\u521b\u5efa\u5957\u63a5\u5b57\u662f\u7f51\u7edc\u901a\u4fe1\u7684\u7b2c\u4e00\u6b65\u3002Linux \u4e2d\u901a\u8fc7 socket() \u7cfb\u7edf\u8c03\u7528\u521b\u5efa\u4e00\u4e2a\u901a\u4fe1\u7aef\u70b9&#xff1a;<\/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><\/p>\n<h4>1.2.1 \u53c2\u6570\u89e3\u6790\u4e0e\u5e38\u6570\u5b9a\u4e49<\/h4>\n<ul>\n<li>domain&#xff08;\u534f\u8bae\u65cf\/\u5730\u5740\u65cf&#xff09;&#xff1a;\u6307\u5b9a\u901a\u4fe1\u7684\u9886\u57df&#xff0c;\u8868\u660e\u662f\u7528\u4e8e\u672c\u5730\u8fdb\u7a0b\u95f4\u901a\u4fe1\u8fd8\u662f\u7f51\u7edc\u901a\u4fe1\u3002\n<ul>\n<li>AF_UNIX \/ AF_LOCAL&#xff1a;\u7528\u4e8e Unix \u672c\u5730\u8fdb\u7a0b\u95f4\u901a\u4fe1\u3002<\/li>\n<li>AF_INET&#xff1a;\u7528\u4e8e IPv4 \u4e92\u8054\u7f51\u534f\u8bae\u3002<\/li>\n<li>AF_INET6&#xff1a;\u7528\u4e8e IPv6 \u4e92\u8054\u7f51\u534f\u8bae\u3002<\/li>\n<\/ul>\n<\/li>\n<li>type&#xff08;\u5957\u63a5\u5b57\u7c7b\u578b&#xff09;&#xff1a;\u6307\u5b9a\u901a\u4fe1\u7684\u6570\u636e\u4f20\u8f93\u670d\u52a1\u7c7b\u578b\u3002\n<ul>\n<li>SOCK_STREAM&#xff1a;\u63d0\u4f9b\u987a\u5e8f\u3001\u53ef\u9760\u3001\u53cc\u5411\u3001\u57fa\u4e8e\u8fde\u63a5\u7684\u5b57\u8282\u6d41\u901a\u4fe1&#xff08;TCP&#xff09;\u3002<\/li>\n<li>SOCK_DGRAM&#xff1a;\u652f\u6301\u6570\u636e\u62a5\u901a\u4fe1&#xff0c;\u5373\u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u3001\u56fa\u5b9a\u6700\u5927\u957f\u5ea6\u7684\u6d88\u606f&#xff08;UDP&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>protocol&#xff08;\u534f\u8bae\u7c7b\u578b&#xff09;&#xff1a;\u901a\u5e38\u8bbe\u7f6e\u4e3a 0&#xff0c;\u7cfb\u7edf\u4f1a\u6839\u636e domain \u548c type \u81ea\u52a8\u63a8\u5bfc\u51fa\u9ed8\u8ba4\u7684\u534f\u8bae\u7c7b\u578b&#xff08;\u4f8b\u5982\u9488\u5bf9 AF_INET \u548c SOCK_DGRAM \u9ed8\u8ba4\u9009\u62e9 UDP \u534f\u8bae&#xff09;\u3002<\/li>\n<\/ul>\n<h4>1.2.2 \u8fd4\u56de\u503c\u4e0e\u201c\u7f51\u7edc\u7686\u6587\u4ef6\u201d\u54f2\u5b66<\/h4>\n<ul>\n<li>\u6210\u529f&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;File Descriptor, FD&#xff09;\u3002<\/li>\n<li>\u5931\u8d25&#xff1a;\u8fd4\u56de -1&#xff0c;\u5e76\u8bbe\u7f6e errno \u9519\u8bef\u7801\u3002<\/li>\n<\/ul>\n<p>\u2003\u2003\u5957\u63a5\u5b57\u5728 Linux \u7cfb\u7edf\u4e2d\u88ab\u62bd\u8c61\u4e3a\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8fd9\u4f53\u73b0\u4e86 Linux \u201c\u4e00\u5207\u7686\u6587\u4ef6\u201d \u7684\u8bbe\u8ba1\u54f2\u5b66\u3002\u7f51\u7edc\u8bbe\u5907\u7684\u8bfb\u5199\u4e0e\u666e\u901a\u6587\u4ef6\u7684\u8bfb\u5199\u5728\u5185\u6838\u5c42\u9762\u6709\u7740\u9ad8\u5ea6\u7edf\u4e00\u7684\u64cd\u4f5c\u63a5\u53e3\u3002<\/p>\n<h3>1.3 \u5730\u5740\u7ed3\u6784\u4f53\u8be6\u89e3&#xff1a;sockaddr_in<\/h3>\n<p>\u2003\u2003\u4e3a\u4e86\u517c\u5bb9\u4e0d\u540c\u534f\u8bae\u65cf\u7684\u5730\u5740\u683c\u5f0f&#xff0c;Linux \u8bbe\u8ba1\u4e86\u901a\u7528\u5957\u63a5\u5b57\u7ed3\u6784\u4f53 struct sockaddr&#xff0c;\u800c\u9488\u5bf9 IPv4 \u7f51\u7edc\u901a\u4fe1&#xff0c;\u5b9e\u9645\u4f7f\u7528\u7684\u662f\u4e13\u95e8\u7684 struct sockaddr_in\u3002<\/p>\n<h4>1.3.1 sockaddr_in \u7ed3\u6784\u4f53\u6210\u5458\u5b9a\u4e49<\/h4>\n<p>\u2003\u2003struct sockaddr_in \u7684\u5185\u90e8\u7ec4\u7ec7\u7ed3\u6784\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">__SOCKADDR_COMMON<\/span> <span class=\"token punctuation\">(<\/span>sin_<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* 16\u4f4d\u5730\u5740\u7c7b\u578b\/\u534f\u8bae\u5bb6\u65cf, \u5982 AF_INET *\/<\/span><br \/>\n    in_port_t sin_port<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/* 16\u4f4d\u7aef\u53e3\u53f7 (\u7f51\u7edc\u5b57\u8282\u5e8f) *\/<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">in_addr<\/span> sin_addr<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/* 32\u4f4d IP \u5730\u5740 (\u7f51\u7edc\u5b57\u8282\u5e8f) *\/<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> sin_zero<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/* \u586b\u5145\u9879&#xff0c;\u7528\u4e8e\u4fdd\u6301\u4e0e struct sockaddr \u5927\u5c0f\u4e00\u81f4 *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2003\u2003\u7ed3\u6784\u4f53\u6210\u5458\u89e3\u6790&#xff1a;<\/p>\n<ul>\n<li>\u5730\u5740\u7c7b\u578b&#xff08;sa_family&#xff09;&#xff1a;\u901a\u8fc7\u5185\u6838\u5b8f __SOCKADDR_COMMON(sin_) \u5c55\u5f00\u540e\u4e3a sa_family_t sin_family&#xff0c;\u7528\u4e8e\u6307\u5b9a\u534f\u8bae\u65cf&#xff08;\u5982 AF_INET&#xff09;\u3002\u5176\u4e2d ## \u662f C \u8bed\u8a00\u9884\u5904\u7406\u5668\u8fd0\u7b97\u7b26&#xff0c;\u7528\u4e8e\u5c06\u7b26\u53f7\u62fc\u63a5\u5408\u5e76\u3002<\/li>\n<li>\u7aef\u53e3\u53f7&#xff08;sin_port&#xff09;&#xff1a;16 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570&#xff0c;\u8868\u793a\u901a\u4fe1\u8fdb\u7a0b\u7684\u7aef\u53e3\u53f7\u3002<\/li>\n<li>IP \u5730\u5740&#xff08;sin_addr&#xff09;&#xff1a;\u5185\u90e8\u5305\u542b\u4e00\u4e2a 32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570&#xff0c;\u8868\u793a IPv4 \u5730\u5740\u3002<\/li>\n<li>\u586b\u5145\u7269&#xff08;sin_zero&#xff09;&#xff1a;\u586b\u5145 8 \u4e2a\u5b57\u8282&#xff0c;\u4fdd\u8bc1\u6574\u4e2a struct sockaddr_in \u7ed3\u6784\u4f53\u7684\u5927\u5c0f\u4e0e\u901a\u7528\u7684 struct sockaddr&#xff08;14\u5b57\u8282\u5730\u5740\u6570\u636e &#043; 2\u5b57\u8282\u7c7b\u578b&#xff09;\u76f8\u5951\u5408\u3002<\/li>\n<\/ul>\n<h3>1.4 IP \u5730\u5740\u8f6c\u6362\u4e0e\u5b57\u8282\u5e8f\u5904\u7406<\/h3>\n<p>\u2003\u2003\u5728\u8ba1\u7b97\u673a\u5185\u90e8\u4e0e\u7f51\u7edc\u4f20\u8f93\u4e2d&#xff0c;IP \u5730\u5740\u7684\u8868\u793a\u5f62\u5f0f\u622a\u7136\u4e0d\u540c&#xff1a;\u7528\u6237\u4e60\u60ef\u4f7f\u7528\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32&#xff08;\u5982 &#034;192.168.1.1&#034;&#xff09;&#xff0c;\u800c\u7f51\u7edc\u5e95\u5c42\u4f20\u8f93\u548c\u7ed3\u6784\u4f53\u5b58\u50a8\u9700\u8981\u4f7f\u7528 32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570&#xff08;uint32_t&#xff09;&#xff0c;\u4e14\u5fc5\u987b\u9075\u5faa\u7f51\u7edc\u5b57\u8282\u5e8f&#xff08;\u5927\u7aef\u5b57\u8282\u5e8f&#xff09;\u3002<\/p>\n<h4>1.4.1 \u70b9\u5206\u5341\u8fdb\u5236\u4e0e\u7f51\u7edc\u5b57\u8282\u5e8f\u6574\u6570\u8f6c\u6362<\/h4>\n<li>\n<p>IP \u5b57\u7b26\u4e32\u8f6c 4 \u5b57\u8282\u7f51\u7edc\u5b57\u8282\u5e8f&#xff1a; \u4f7f\u7528 API inet_addr \u53ef\u4ee5\u4e00\u6b65\u5b8c\u6210\u5c06\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u7684 32 \u4f4d\u6574\u6570&#xff1a;<\/p>\n<p> in_addr_t <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>cp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u8f6c\u6362\u539f\u7406\u5256\u6790&#xff1a;<\/p>\n<ul>\n<li>\u5c06\u5b57\u7b26\u4e32 &#034;192.168.1.1&#034; \u6309 . \u5207\u5206\u4e3a 4 \u4e2a\u6574\u578b\u90e8\u5206&#xff08;192, 168, 1, 1&#xff09;\u3002<\/li>\n<li>\u6bcf\u4e2a\u90e8\u5206\u5360\u7528\u4e00\u4e2a\u5b57\u8282&#xff08;char&#xff09;&#xff0c;\u62fc\u63a5\u7ec4\u6210\u4e00\u4e2a 32 \u4f4d\u6574\u6570\u3002<\/li>\n<li>\u6839\u636e\u7f51\u7edc\u4f20\u8f93\u534f\u8bae&#xff0c;\u5c06\u6570\u503c\u8c03\u6574\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f&#xff08;\u5927\u7aef\u5e8f&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u53cd\u5411\u8f6c\u6362\u539f\u7406&#xff1a; \u5f53\u9700\u8981\u5c06\u63a5\u6536\u5230\u7684 32 \u4f4d\u7f51\u7edc\u5b57\u8282\u5e8f IP \u8f6c\u6362\u4e3a\u53ef\u8bfb\u5b57\u7b26\u4e32\u65f6&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u6307\u9488\u5f3a\u8f6c\u53d6\u51fa\u5404\u4e2a\u5b57\u8282\u7684\u5185\u5bb9&#xff0c;\u5e76\u7ec4\u5408\u62fc\u88c5\u6210\u70b9\u5206\u5341\u8fdb\u5236\u683c\u5f0f\u3002<\/p>\n<\/li>\n<h3>1.5 \u6570\u636e\u63a5\u6536\u4e0e\u54cd\u5e94\u5904\u7406&#xff1a;recvfrom \u51fd\u6570<\/h3>\n<p>\u2003\u2003\u7f51\u7edc\u670d\u52a1\u5668\u901a\u5e38\u9700\u8981 7*24 \u5c0f\u65f6\u4e0d\u65ad\u8fd0\u884c&#xff0c;\u56e0\u6b64 UDP \u670d\u52a1\u5668\u7684\u6838\u5fc3\u903b\u8f91\u5f80\u5f80\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af&#xff0c;\u6301\u7eed\u76d1\u542c\u5e76\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u3002 \u2003\u2003Linux \u7cfb\u7edf\u63d0\u4f9b\u4e86 recvfrom \u51fd\u6570\u7528\u4e8e\u63a5\u6536\u9762\u5411\u65e0\u8fde\u63a5\u7684\u6570\u636e\u5305&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                 <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>src_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<h4>1.5.1 recvfrom \u53c2\u6570\u4e0e\u8fd4\u56de\u503c<\/h4>\n<ul>\n<li>sockfd&#xff1a;socket() \u51fd\u6570\u8fd4\u56de\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf&#xff1a;\u7528\u4e8e\u5b58\u653e\u63a5\u6536\u6570\u636e\u7684\u5185\u5b58\u7f13\u51b2\u533a\u6307\u9488\u3002<\/li>\n<li>len&#xff1a;\u7f13\u51b2\u533a\u7684\u6700\u5927\u53ef\u7528\u5b57\u8282\u6570\u3002<\/li>\n<li>flags&#xff1a;\u63a5\u6536\u63a7\u5236\u6807\u5fd7\u4f4d&#xff0c;\u901a\u5e38\u8bbe\u7f6e\u4e3a 0 \u8868\u793a\u963b\u585e\u5f0f\u63a5\u6536\u3002<\/li>\n<li>src_addr&#xff1a;\u8f93\u51fa\u578b\u53c2\u6570&#xff0c;\u586b\u5165\u4e00\u4e2a struct sockaddr_in \u5f3a\u8f6c\u540e\u7684\u6307\u9488&#xff0c;\u7528\u4e8e\u83b7\u53d6\u53d1\u9001\u65b9&#xff08;\u5ba2\u6237\u7aef&#xff09;\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u4fe1\u606f\u3002<\/li>\n<li>addrlen&#xff1a;\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570&#xff0c;\u4f20\u5165\u65f6\u4e3a src_addr \u7ed3\u6784\u4f53\u7684\u5927\u5c0f&#xff08;sizeof(struct sockaddr_in)&#xff09;&#xff0c;\u8fd4\u56de\u65f6\u4e3a\u5185\u6838\u5b9e\u9645\u5199\u5165\u7684\u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53\u5927\u5c0f\u3002<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u5b9e\u9645\u63a5\u6536\u5230\u7684\u6570\u636e\u5b57\u8282\u6570&#xff1b;\u82e5\u8fde\u63a5\u5173\u95ed\u6216\u51fa\u9519\u5219\u8fd4\u56de -1 \u5e76\u8bbe\u7f6e errno\u3002<\/li>\n<\/ul>\n<h2>\u4e8c\u3001UDP \u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u6838\u5fc3\u901a\u4fe1\u6d41\u7a0b\u5b9e\u73b0<\/h2>\n<p>\u2003\u2003\u5728\u4e0a\u6587\u7406\u89e3\u4e86 UDP \u5957\u63a5\u5b57\u7684\u57fa\u7840\u6982\u5ff5\u3001\u5957\u63a5\u5b57\u521b\u5efa\u53ca\u6570\u636e\u7ed3\u6784\u540e&#xff0c;\u63a5\u4e0b\u6765\u6211\u4eec\u8bb2\u89e3\u8bb2\u89e3 UDP \u670d\u52a1\u5668\u7684\u7ed1\u5b9a\u7ed1\u5b9a\u521d\u59cb\u5316&#xff08;bind&#xff09;\u3001\u6570\u636e\u6536\u53d1&#xff08;recvfrom \u4e0e sendto&#xff09;\u4ee5\u53ca\u5ba2\u6237\u7aef\u8bf7\u6c42\u673a\u5236\u7684\u5e95\u5c42\u903b\u8f91\u3002<\/p>\n<h3>2.1 \u670d\u52a1\u5668\u5957\u63a5\u5b57\u521d\u59cb\u5316\u4e0e\u5730\u5740\u7ed1\u5b9a<\/h3>\n<p>\u2003\u2003\u521b\u5efa\u4e00\u4e2a UDP \u670d\u52a1\u5668\u9996\u5148\u9700\u8981\u5b8c\u6210\u5957\u63a5\u5b57\u7684\u521d\u59cb\u5316&#xff0c;\u5e76\u5c06\u7279\u5b9a\u7684 IP \u548c\u7aef\u53e3\u4fe1\u606f\u7ed1\u5b9a&#xff08;Bind&#xff09;\u5230\u5185\u6838\u4e2d\u3002<\/p>\n<h4>2.1.1 \u7ed3\u6784\u4f53\u6e05\u96f6&#xff1a;bzero \u4e0e explicit_bzero<\/h4>\n<p>\u2003\u2003\u5728\u586b\u5145 struct sockaddr_in \u524d&#xff0c;\u901a\u5e38\u9700\u8981\u5c06\u7ed3\u6784\u4f53\u5360\u7528\u7684\u5185\u5b58\u6e05\u96f6&#xff0c;\u4ee5\u9632\u6b62\u810f\u6570\u636e\u5f71\u54cd\u901a\u4fe1\u3002\u5728 Linux \u73af\u5883\u4e0b\u53ef\u4f7f\u7528\u4ee5\u4e0b\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;strings.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">bzero<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">,<\/span> size_t n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">explicit_bzero<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">,<\/span> size_t n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>bzero&#xff1a;\u5c06\u6307\u5b9a\u5185\u5b58\u7a7a\u95f4\u7684\u524d n \u4e2a\u5b57\u8282\u5168\u90e8\u6e05\u96f6&#xff08;\\\\0&#xff09;\u3002<\/li>\n<li>explicit_bzero&#xff1a;\u529f\u80fd\u4e0e bzero \u76f8\u540c&#xff0c;\u4f46\u53ef\u4ee5\u9632\u6b62\u7f16\u8bd1\u5668\u4f18\u5316\u6389\u201c\u770b\u4f3c\u65e0\u7528\u201d\u7684\u5185\u5b58\u6e05\u96f6\u64cd\u4f5c&#xff08;\u4f8b\u5982\u5728\u654f\u611f\u6570\u636e\u5904\u7406\u5b8c\u6210\u540e&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u2003\u2003\u5728\u670d\u52a1\u5668\u521d\u59cb\u5316\u9636\u6bb5&#xff0c;\u9996\u5148\u5bf9\u5957\u63a5\u5b57\u5730\u5740\u7ed3\u6784\u4f53\u8fdb\u884c\u6e05\u96f6&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> local<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">bzero<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>local<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5176\u5b9e\u8fd8\u53ef\u4ee5\u7528memset\u6765\u8bbe\u7f6e&#xff0c;\u6548\u679c\u4e00\u6837\u3002<\/p>\n<h4>2.1.2 \u586b\u5145 sockaddr_in \u4e0e\u7f51\u7edc\u5b57\u8282\u5e8f\u8f6c\u6362<\/h4>\n<p>\u2003\u2003\u670d\u52a1\u5668\u7aef\u9700\u8981\u660e\u786e\u6307\u5b9a\u63a5\u6536\u6570\u636e\u6240\u76d1\u542c\u7684\u534f\u8bae\u65cf\u3001\u7aef\u53e3\u53f7\u4ee5\u53ca IP \u5730\u5740\u3002\u7531\u4e8e\u4e3b\u673a\u4e0e\u7f51\u7edc\u4f20\u8f93\u7684\u5b57\u8282\u5e8f\u53ef\u80fd\u4e0d\u540c&#xff08;\u5927\u7aef\u5e8f\u4e0e\u5c0f\u7aef\u5e8f&#xff09;&#xff0c;\u5fc5\u987b\u5c06\u4e3b\u673a\u6570\u636e\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f&#xff08;Big-Endians&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u7aef\u53e3\u53f7\u8f6c\u6362&#xff1a;\u4f7f\u7528 htons(port) \u5c06\u4e3b\u673a\u5b57\u8282\u5e8f&#xff08;16\u4f4d&#xff09;\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u3002<\/li>\n<li>IP \u5730\u5740\u8f6c\u6362&#xff1a;\u4f7f\u7528 inet_addr(ip_str.c_str()) \u5c06\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u7684 32 \u4f4d\u6574\u6570\u3002<\/li>\n<\/ul>\n<p>local<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nlocal<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nlocal<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>_ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2.1.3 \u7ed1\u5b9a\u7cfb\u7edf\u8c03\u7528&#xff1a;bind \u51fd\u6570<\/h4>\n<p>\u2003\u2003\u586b\u5145\u5b8c\u5730\u5740\u7ed3\u6784\u4f53\u540e&#xff0c;\u9700\u8981\u901a\u8fc7 bind() \u7cfb\u7edf\u8c03\u7528\u5c06\u521b\u5efa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 _sockfd \u4e0e\u672c\u5730\u7f51\u7edc\u5730\u5740&#xff08;IP &#043; \u7aef\u53e3&#xff09;\u8fdb\u884c\u5f3a\u5173\u8054\u7ed1\u5b9a&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2003\u2003\u4ee3\u7801\u5b9e\u73b0\u4e0e\u6821\u9a8c\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>local<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>local<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>n <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>FATAL<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;bind error&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003\u6ce8\u610f&#xff1a;bind \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8981\u6c42\u4e3a\u901a\u7528\u5957\u63a5\u5b57\u6307\u9488\u7c7b\u578b struct sockaddr*&#xff0c;\u56e0\u6b64\u4f20\u5165 struct sockaddr_in \u7ed3\u6784\u4f53\u5730\u5740\u65f6\u9700\u8981\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff08;\u6307\u9488\u591a\u6001\/\u5b50\u4f20\u7236&#xff09;\u3002<\/p>\n<h3>2.2 UDP \u5168\u53cc\u5de5\u901a\u4fe1\u4e0e\u6570\u636e\u6536\u53d1\u673a\u5236<\/h3>\n<p>\u2003\u2003UDP \u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26 sockfd \u65e2\u53ef\u7528\u4e8e\u8bfb\u64cd\u4f5c&#xff08;\u63a5\u6536\u6570\u636e&#xff09;&#xff0c;\u4e5f\u53ef\u7528\u4e8e\u5199\u64cd\u4f5c&#xff08;\u53d1\u9001\u6570\u636e&#xff09;&#xff0c;\u8fd9\u8bf4\u660e UDP \u901a\u4fe1\u662f\u5168\u53cc\u5de5&#xff08;Full-Duplex&#xff09;\u7684\u3002<\/p>\n<h4>2.2.1 \u6570\u636e\u63a5\u6536\u673a\u5236&#xff1a;recvfrom \u4e0e\u963b\u585e IO<\/h4>\n<p>\u2003\u2003\u670d\u52a1\u7aef\u5728 7*24 \u5c0f\u65f6\u6b7b\u5faa\u73af\u8fd0\u884c\u4e2d&#xff0c;\u4f7f\u7528 recvfrom \u83b7\u53d6\u5ba2\u6237\u7aef\u6570\u636e\u3002<\/p>\n<p>ssize_t <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                 <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>src_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<h5>\u963b\u585e IO \u884c\u4e3a\u7279\u5f81<\/h5>\n<p>\u2003\u2003\u5f53 flags \u8bbe\u7f6e\u4e3a 0 \u65f6&#xff0c;recvfrom \u8868\u73b0\u4e3a\u963b\u585e\u5f0f IO&#xff08;Blocking IO&#xff09;\u3002\u5982\u679c\u5ba2\u6237\u7aef\u6ca1\u6709\u53d1\u9001\u6570\u636e&#xff0c;\u670d\u52a1\u7aef\u8fdb\u7a0b\u5c06\u5728\u6b64\u5904\u4e00\u76f4\u7b49\u5f85\u6302\u8d77&#xff08;\u7c7b\u4f3c\u4e8e C \u8bed\u8a00\u7684\u6807\u51c6\u8f93\u5165 scanf&#xff09;&#xff0c;\u76f4\u5230\u6709\u6570\u636e\u5230\u8fbe\u7f51\u7edc\u7f13\u51b2\u533a\u3002<\/p>\n<h5>\u591a\u5bf9\u4e00\u901a\u4fe1\u4e0e\u5bf9\u7aef\u5957\u63a5\u5b57\u83b7\u53d6<\/h5>\n<p>\u2003\u2003\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u901a\u5e38\u662f\u591a\u5bf9\u4e00\u7684\u5173\u7cfb\u3002\u670d\u52a1\u5668\u5728\u5904\u7406\u6570\u636e\u65f6&#xff0c;\u4e0d\u4ec5\u8981\u83b7\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u201c\u6587\u672c\u6570\u636e\u201d&#xff08;\u5b58\u50a8\u5728 buf \u4e2d&#xff09;&#xff0c;\u8fd8\u9700\u8981\u77e5\u9053\u201c\u8c01\u53d1\u6765\u7684\u201d&#xff08;\u5373\u5ba2\u6237\u7aef\u7684 IP \u548c\u7aef\u53e3&#xff09;\u3002<\/p>\n<ul>\n<li>src_addr&#xff1a;\u8f93\u51fa\u578b\u53c2\u6570\u3002\u5185\u6838\u4f1a\u5728\u63a5\u6536\u6570\u636e\u65f6&#xff0c;\u5c06\u5ba2\u6237\u7aef\u7684 struct sockaddr_in \u5730\u5740\u4fe1\u606f\u5199\u5165\u8be5\u7ed3\u6784\u4f53\u3002<\/li>\n<li>addrlen&#xff1a;\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u3002\u4f20\u5165\u65f6\u8868\u793a\u4f20\u5165\u7ed3\u6784\u4f53\u7684\u5927\u5c0f&#xff08;sizeof(struct sockaddr_in)&#xff09;&#xff0c;\u51fd\u6570\u8fd4\u56de\u65f6\u88ab\u5185\u6838\u4fee\u6539\u4e3a\u5b9e\u9645\u5199\u5165\u7684\u7ed3\u6784\u4f53\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<h4>2.2.2 \u6570\u636e\u53d1\u9001\u673a\u5236&#xff1a;sendto \u51fd\u6570<\/h4>\n<p>\u2003\u2003\u5f53\u670d\u52a1\u5668\u9700\u8981\u5411\u5ba2\u6237\u7aef\u54cd\u5e94\u6d88\u606f&#xff0c;\u6216\u8005\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001\u6570\u636e\u65f6&#xff0c;\u4f7f\u7528 sendto \u7cfb\u7edf\u8c03\u7528&#xff1a;<\/p>\n<p>ssize_t <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n               <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span>dest_addr<span class=\"token punctuation\">,<\/span> socklen_t addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u53c2\u6570\u8be6\u89e3<\/h5>\n<ul>\n<li>sockfd&#xff1a;\u901a\u4fe1\u4f7f\u7528\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf \/ len&#xff1a;\u7528\u6237\u7ea7\u7f13\u51b2\u533a\u6307\u9488\u53ca\u9700\u8981\u53d1\u9001\u7684\u6570\u636e\u957f\u5ea6\u3002<\/li>\n<li>flags&#xff1a;\u53d1\u9001\u63a7\u5236\u6807\u5fd7&#xff0c;\u901a\u5e38\u8bbe\u4e3a 0\u3002<\/li>\n<li>dest_addr \/ addrlen&#xff1a;\u76ee\u7684\u7aef\u7684\u5957\u63a5\u5b57\u5730\u5740\u4fe1\u606f&#xff08;struct sockaddr_in \u8f6c\u6362\u800c\u6765&#xff09;\u53ca\u5176\u7ed3\u6784\u4f53\u5927\u5c0f&#xff0c;\u660e\u786e\u6307\u5b9a\u6570\u636e\u53d1\u7ed9\u8c01\u3002<\/li>\n<\/ul>\n<h5>\u8fd4\u56de\u503c<\/h5>\n<p>\u2003\u2003\u6210\u529f\u65f6\u8fd4\u56de\u5b9e\u9645\u53d1\u9001\u7684\u5b57\u8282\u6570&#xff1b;\u51fa\u9519\u65f6\u8fd4\u56de -1 \u5e76\u8bbe\u7f6e errno\u3002\u7531\u4e8e UDP \u662f\u65e0\u8fde\u63a5\u7684&#xff0c;\u53d1\u9001\u7aef\u6210\u529f\u8c03\u7528 sendto \u4ec5\u610f\u5473\u7740\u6570\u636e\u88ab\u4ea4\u4ed8\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u7f51\u7edc\u6808\u53d1\u9001&#xff0c;\u5e76\u4e0d\u4fdd\u8bc1\u5bf9\u7aef\u4e00\u5b9a\u80fd\u591f\u63a5\u6536\u5230\u3002<\/p>\n<h3>2.3 \u5ba2\u6237\u7aef\u8bbf\u95ee\u673a\u5236\u4e0e\u7aef\u53e3\u5904\u7406<\/h3>\n<p>\u2003\u2003\u5ba2\u6237\u7aef\u8bbf\u95ee UDP \u670d\u52a1\u7aef\u65f6&#xff0c;\u5fc5\u987b\u83b7\u5f97\u670d\u52a1\u7aef\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u3002<\/p>\n<h4>2.3.1 \u670d\u52a1\u7aef\u5730\u5740\u7684\u201c\u786c\u7f16\u7801\u201d\u4e0e\u914d\u7f6e\u6587\u4ef6<\/h4>\n<p>\u2003\u2003\u5ba2\u6237\u7aef\u5982\u4f55\u611f\u77e5\u670d\u52a1\u7aef\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff1f; \u2003\u2003\u5728\u5b9e\u9645\u5e94\u7528\u4e2d&#xff0c;\u7531\u4e8e\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u7a0b\u5e8f\u901a\u5e38\u662f\u7531\u540c\u4e00\u5bb6\u516c\u53f8&#xff08;\u6216\u540c\u4e00\u4e2a\u5f00\u53d1\u56e2\u961f&#xff09;\u7814\u53d1&#xff0c;\u670d\u52a1\u7aef\u7684 IP \u5730\u5740\u548c\u9ed8\u8ba4\u7aef\u53e3\u53f7\u901a\u5e38\u4f1a\u5185\u7f6e\u786c\u7f16\u7801\u5728\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u4e2d&#xff0c;\u6216\u8005\u901a\u8fc7\u57df\u540d\u89e3\u6790&#xff08;DNS&#xff09;\u3001\u914d\u7f6e\u6587\u4ef6\u52a8\u6001\u52a0\u8f7d\u83b7\u53d6\u3002<\/p>\n<h4>2.3.2 \u5ba2\u6237\u7aef\u7684\u9690\u5f0f Bind<\/h4>\n<p>\u2003\u2003\u4e0e\u670d\u52a1\u7aef\u5fc5\u987b\u663e\u793a\u8c03\u7528 bind() \u7ed1\u5b9a\u56fa\u5b9a\u7aef\u53e3\u4e0d\u540c&#xff0c;\u5ba2\u6237\u7aef\u901a\u5e38\u4e0d\u9700\u8981\u663e\u5f0f\u8c03\u7528 bind()&#xff1a;<\/p>\n<ul>\n<li>\u5982\u679c\u5ba2\u6237\u7aef\u663e\u5f0f\u7ed1\u5b9a\u56fa\u5b9a\u7aef\u53e3&#xff0c;\u53ef\u80fd\u4e0e\u7528\u6237\u673a\u5668\u4e0a\u5176\u4ed6\u5df2\u8fd0\u884c\u7684\u7a0b\u5e8f\u53d1\u751f\u7aef\u53e3\u51b2\u7a81&#xff0c;\u5bfc\u81f4\u5ba2\u6237\u7aef\u542f\u52a8\u5931\u8d25\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u5728\u7b2c\u4e00\u6b21\u8c03\u7528 sendto() \u53d1\u9001\u6570\u636e\u5305\u65f6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4f1a\u81ea\u52a8\u3001\u968f\u673a\u5730\u4e3a\u5ba2\u6237\u7aef\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u7a7a\u95f2\u7aef\u53e3\u53f7\u5e76\u5b8c\u6210\u9690\u5f0f\u7ed1\u5b9a\u3002<\/li>\n<\/ul>\n<h2>\u4e09\u3001Client \u7aef\u7684 Bind \u7b56\u7565\u4e0e Server \u7aef\u7684 Bind \u5fc5\u8981\u6027\u6df1\u5ea6\u89e3\u6790<\/h2>\n<p>\u2003\u2003\u5728\u524d\u6587\u4ecb\u7ecd\u5b8c UDP \u7684\u57fa\u7840 API \u548c\u6838\u5fc3\u901a\u4fe1\u6d41\u7a0b\u540e&#xff0c;\u7ecf\u5e38\u4f1a\u6709\u5173\u4e8e\u5957\u63a5\u5b57\u7ed1\u5b9a\u7684\u51e0\u4e2a\u7ecf\u5178\u7591\u95ee&#xff1a;\u5ba2\u6237\u7aef\u5230\u5e95\u9700\u4e0d\u9700\u8981 bind&#xff1f;\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u4e0d\u80fd\u663e\u5f0f bind&#xff1f;\u670d\u52a1\u5668\u53c8\u4e3a\u4ec0\u4e48\u5fc5\u987b\u663e\u5f0f bind&#xff1f;<\/p>\n<h3>3.1 \u5ba2\u6237\u7aef\u8981\u4e0d\u8981 bind&#xff1f;<\/h3>\n<p>\u2003\u2003\u7ed3\u8bba&#xff1a;\u5ba2\u6237\u7aef\u9700\u8981 bind&#xff0c;\u4f46\u7edd\u5bf9\u4e0d\u9700\u8981\u201c\u663e\u5f0f&#xff08;\u624b\u52a8&#xff09;bind\u201d\u3002<\/p>\n<ul>\n<li>\u4e3a\u4ec0\u4e48\u9700\u8981 bind&#xff1a;\u4efb\u4f55\u7f51\u7edc\u901a\u4fe1\u5728\u4f20\u8f93\u5c42\u90fd\u5fc5\u987b\u660e\u786e\u6807\u8bc6\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u3002IP \u5730\u5740\u7528\u4e8e\u5728\u7f51\u7edc\u4e2d\u5b9a\u4f4d\u4e3b\u673a&#xff0c;\u800c\u7aef\u53e3\u53f7\u7528\u4e8e\u5728\u4e3b\u673a\u4e0a\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u901a\u4fe1\u8fdb\u7a0b\u3002\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u5305\u65f6&#xff0c;\u5fc5\u987b\u5305\u542b\u201c\u6e90 IP &#043; \u6e90\u7aef\u53e3\u201d&#xff0c;\u4ee5\u4fbf\u670d\u52a1\u5668\u5904\u7406\u5b8c\u8bf7\u6c42\u540e\u80fd\u591f\u51c6\u786e\u5730\u5c06\u6570\u636e\u54cd\u5e94\u56de\u5ba2\u6237\u7aef\u3002<\/li>\n<li>\u4e3a\u4ec0\u4e48\u7531 OS \u9690\u5f0f\u5b8c\u6210&#xff1a;\n<li>\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u4fe1\u4efb\u7528\u6237&#xff1a;\u5982\u679c\u5141\u8bb8\u5ba2\u6237\u7aef\u4ee3\u7801\u663e\u5f0f\u5199\u6b7b\u7aef\u53e3\u53f7&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u65e0\u6cd5\u4fdd\u969c\u8be5\u7aef\u53e3\u5728\u7528\u6237\u7684\u8ba1\u7b97\u673a\u4e0a\u672a\u88ab\u5176\u4ed6\u7a0b\u5e8f\u5360\u7528\u3002\u4e00\u65e6\u53d1\u751f\u7aef\u53e3\u51b2\u7a81&#xff08;\u4e00\u4e2a\u7aef\u53e3\u53f7\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b bind&#xff09;&#xff0c;\u5ba2\u6237\u7aef\u7a0b\u5e8f\u5c31\u4f1a\u542f\u52a8\u5931\u8d25\u3002<\/li>\n<li>\u968f\u673a\u7aef\u53e3\u673a\u5236&#xff1a;\u5f53\u5ba2\u6237\u7aef\u9996\u6b21\u8c03\u7528 sendto() \u53d1\u9001\u6d88\u606f\u65f6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4f1a\u81ea\u52a8\u83b7\u53d6\u672c\u673a\u7684 IP&#xff0c;\u5e76\u4ece\u5f53\u524d\u7a7a\u95f2\u7684\u52a8\u6001\u7aef\u53e3\u6c60\u4e2d\u968f\u673a\u6311\u9009\u4e00\u4e2a\u672a\u88ab\u5360\u7528\u7684\u7aef\u53e3\u5206\u914d\u7ed9\u8be5\u5957\u63a5\u5b57&#xff0c;\u81ea\u52a8\u5b8c\u6210 bind \u64cd\u4f5c\u3002<\/li>\n<li>\u7aef\u53e3\u503c\u7684\u65e0\u5173\u7d27\u8981\u6027&#xff1a;\u5bf9\u4e8e\u5ba2\u6237\u7aef\u800c\u8a00&#xff0c;\u5177\u4f53\u5360\u7528\u54ea\u4e00\u4e2a\u7aef\u53e3\u53f7\u5e76\u4e0d\u91cd\u8981&#xff0c;\u53ea\u8981\u5728\u6b64\u6b21\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u8be5\u7aef\u53e3\u53f7\u662f\u552f\u4e00\u7684\u5373\u53ef\u3002<\/li>\n<\/li>\n<\/ul>\n<h3>3.2 \u4e3a\u4ec0\u4e48\u670d\u52a1\u7aef\u5fc5\u987b\u663e\u5f0f bind&#xff1f;<\/h3>\n<p>\u2003\u2003\u4e0e\u5ba2\u6237\u7aef\u4e0d\u540c&#xff0c;\u670d\u52a1\u5668\u7aef\u5fc5\u987b\u663e\u5f0f\u8c03\u7528 bind() \u6765\u6307\u5b9a\u56fa\u5b9a\u4e14\u4f17\u6240\u5468\u77e5\u7684 IP \u548c\u7aef\u53e3\u53f7\u3002<\/p>\n<ul>\n<li>\u670d\u52a1\u5668\u7684\u5bf9\u5916\u670d\u52a1\u5c5e\u6027&#xff1a;\u670d\u52a1\u5668\u662f\u4e3a\u4e0d\u7279\u5b9a\u7684\u4f17\u591a\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1\u7684\u3002\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u8bf7\u6c42\u7684\u524d\u63d0&#xff0c;\u662f\u5fc5\u987b\u5728\u53d1\u9001\u524d\u5c31\u77e5\u9053\u670d\u52a1\u5668\u7684 IP \u548c\u7aef\u53e3\u53f7\u3002<\/li>\n<li>\u4f17\u6240\u5468\u77e5\u4e14\u4e0d\u53ef\u8f7b\u6613\u6539\u53d8&#xff1a;\n<ul>\n<li>\u670d\u52a1\u5668\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u5fc5\u987b\u662f\u56fa\u5b9a\u7684&#xff08;\u4f17\u6240\u5468\u77e5\u7684\u670d\u52a1\u7aef\u53e3&#xff0c;\u5982 HTTP \u7684 80\u3001HTTPS \u7684 443\u3001\u81ea\u5b9a\u4e49\u670d\u52a1\u7b49&#xff09;\u3002<\/li>\n<li>\u5982\u679c\u670d\u52a1\u5668\u6bcf\u6b21\u91cd\u542f\u90fd\u7531\u64cd\u4f5c\u7cfb\u7edf\u968f\u673a\u5206\u914d\u7aef\u53e3&#xff0c;\u5ba2\u6237\u7aef\u5c06\u65e0\u6cd5\u5b9a\u4f4d\u670d\u52a1\u5668\u7684\u4f4d\u7f6e&#xff0c;\u5bfc\u81f4\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\u3002<\/li>\n<li>\u540e\u679c\u4e25\u91cd\u6027&#xff1a;\u5982\u679c\u670d\u52a1\u5668\u968f\u610f\u53d8\u66f4\u7aef\u53e3&#xff0c;\u6216\u8005\u6ca1\u6709\u8fdb\u884c\u663e\u5f0f bind&#xff0c;\u5728\u77ed\u65f6\u95f4\u5185\u6240\u6709\u4f9d\u8d56\u8be5\u7aef\u53e3\u7684\u5ba2\u6237\u7aef\u90fd\u5c06\u65e0\u6cd5\u8bbf\u95ee\u670d\u52a1\u5668&#xff0c;\u9020\u6210\u670d\u52a1\u4e2d\u65ad\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u56db\u3001\u670d\u52a1\u5668 IP \u7ed1\u5b9a\u9677\u9631\u3001INADDR_ANY \u539f\u7406\u4e0e\u8f6c\u6362\u51fd\u6570\u6f14\u8fdb<\/h2>\n<p>\u2003\u2003\u5b9e\u9645\u5f00\u53d1\u4e2d\u670d\u52a1\u5668\u7aef\u7684 IP \u7ed1\u5b9a\u7b56\u7565\u7b56\u7565\u4f9d\u7136\u5b58\u5728\u8bf8\u591a\u201c\u5751\u70b9\u201d\u3002\u63a5\u4e0b\u6765\u6211\u5c06\u6df1\u5165\u5206\u6790\u4e91\u670d\u52a1\u5668\u73af\u5883\u4e0b\u7684 IP \u7ed1\u5b9a\u7ea6\u675f\u3001INADDR_ANY \u7684\u5e95\u5c42\u903b\u8f91\u3001\u5e94\u7528\u5c42\u8f6f\u4ef6\u5206\u5c42\u8bbe\u8ba1\u4ee5\u53ca\u5730\u5740\u8f6c\u6362\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168\u6f14\u8fdb\u3002<\/p>\n<h3>4.1 \u670d\u52a1\u5668 IP \u7ed1\u5b9a\u7684\u201c\u5751\u201d\u4e0e INADDR_ANY \u539f\u7406<\/h3>\n<p>\u2003\u2003\u5728\u5b9e\u9645\u90e8\u7f72 UDP \u670d\u52a1\u5668\u65f6&#xff0c;\u76f4\u63a5\u6307\u5b9a\u5177\u4f53\u7684 IP \u5730\u5740&#xff08;\u5982\u516c\u7f51 IP \u6216\u5177\u4f53\u5185\u7f51 IP&#xff09;\u901a\u5e38\u4f1a\u5bfc\u81f4\u5404\u79cd\u7ed1\u5b9a\u9519\u8bef\u6216\u8bbf\u95ee\u9650\u5236\u3002<\/p>\n<p>                    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n                    \u2502      \u4e91\u670d\u52a1\u5668 (\u4e3b\u673a)       \u2502<br \/>\n                    \u2502                           \u2502<br \/>\n  [\u5ba2\u6237\u7aef\u8bbf\u95ee] \u2500\u2500\u2500&gt; \u2502  \u7f51\u53611: \u672c\u5730\u73af\u56de 127.0.0.1 \u2502<br \/>\n                    \u2502  \u7f51\u53612: \u5185\u7f51 IP (\u79c1\u7f51)    \u2502<br \/>\n                    \u2502  (\u516c\u7f51 IP \u6302\u8f7d\u5728\u5916\u90e8\u7f51\u5173) \u2502<br \/>\n                    \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n                                  \u2502<br \/>\n                   \u63a8\u8350\u4f7f\u7528 INADDR_ANY (0.0.0.0)<br \/>\n                        \u76d1\u542c\u53d1\u9001\u5230\u672c\u673a\u6240\u6709\u7f51\u5361\u7684\u6570\u636e<\/p>\n<h4>4.1.1 \u5e38\u89c1\u7684\u7ed1\u5b9a\u8bef\u533a<\/h4>\n<li>\u76f4\u63a5 bind \u516c\u7f51 IP \u2014\u2014 \u5931\u8d25&#xff1a; \u5728\u4e91\u5382\u5546&#xff08;\u5982\u963f\u91cc\u4e91\u3001\u817e\u8baf\u4e91\u7b49&#xff09;\u63d0\u4f9b\u7684\u4e91\u670d\u52a1\u5668\u4e0a&#xff0c;\u7269\u7406\u7f51\u5361\u6216\u865a\u62df\u7f51\u5361\u4e0a\u914d\u7f6e\u7684\u901a\u5e38\u662f\u5185\u7f51 IP&#xff08;\u79c1\u7f51 IP&#xff09;&#xff0c;\u516c\u7f51 IP \u662f\u901a\u8fc7 NAT&#xff08;\u7f51\u7edc\u5730\u5740\u8f6c\u6362&#xff09;\u6620\u5c04\u5230\u4e91\u670d\u52a1\u5668\u4e0a\u7684&#xff0c;\u5b83\u5e76\u6ca1\u6709\u76f4\u63a5\u914d\u7f6e\u5230\u4e91\u670d\u52a1\u5668\u7684\u672c\u5730\u7f51\u5361\u8bbe\u5907\u4e0a\u3002\u56e0\u6b64\u5728\u4ee3\u7801\u4e2d\u663e\u5f0f bind \u516c\u7f51 IP \u4f1a\u5bfc\u81f4\u7cfb\u7edf\u76f4\u63a5\u62a5\u9519\u8fd4\u56de bind error\u3002<\/li>\n<li>bind 127.0.0.1 \u6216\u7279\u5b9a\u5185\u7f51 IP \u2014\u2014 \u5c40\u9650\u6027\u5927&#xff1a;\n<ul>\n<li>\u5982\u679c bind \u4e86 127.0.0.1&#xff08;\u672c\u5730\u73af\u56de\u5730\u5740&#xff09;&#xff0c;\u6570\u636e\u5305\u53ea\u80fd\u5728 OS \u5185\u90e8\u8f6c\u5708&#xff0c;\u4ec5\u5141\u8bb8\u540c\u4e00\u53f0\u673a\u5668\u4e0a\u7684\u5ba2\u6237\u7aef\u8bbf\u95ee&#xff0c;\u5916\u754c\u65e0\u6cd5\u8de8\u7f51\u7edc\u8bbf\u95ee\u3002<\/li>\n<li>\u5982\u679c bind \u4e86\u5177\u4f53\u7684\u5185\u7f51 IP&#xff0c;\u5f53\u5ba2\u6237\u7aef\u4f7f\u7528 127.0.0.1 \u53d1\u9001\u6570\u636e\u65f6\u5c06\u65e0\u6cd5\u88ab\u63a5\u6536&#xff1b;\u53cd\u4e4b\u4ea6\u7136\u3002\u5373&#xff1a;\u663e\u5f0f\u7ed1\u5b9a\u7279\u5b9a\u5730\u5740\u540e&#xff0c;\u5ba2\u6237\u7aef\u5fc5\u987b\u4e14\u53ea\u80fd\u901a\u8fc7\u8be5\u7279\u5b9a\u5730\u5740\u624d\u80fd\u6210\u529f\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<\/li>\n<h4>4.1.2 \u6700\u4f73\u5b9e\u8df5&#xff1a;\u4f7f\u7528 INADDR_ANY&#xff08;\u4efb\u610f\u5730\u5740\u7ed1\u5b9a&#xff09;<\/h4>\n<p>\u2003\u2003\u4e3a\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898&#xff0c;\u670d\u52a1\u5668\u5728\u521d\u59cb\u5316 sockaddr_in \u7ed3\u6784\u4f53\u65f6&#xff0c;\u5f3a\u70c8\u5efa\u8bae\u4e0d\u7ed1\u5b9a\u5177\u4f53\u7684\u9759\u6001 IP \u5730\u5740&#xff0c;\u800c\u662f\u4f7f\u7528 INADDR_ANY&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5728\u5b8f\u5b9a\u4e49\u4e2d&#xff0c;INADDR_ANY \u5373\u4e3a 0x00000000 (\u5168 0 \u5730\u5740)<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">INADDR_ANY<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>in_addr_t<span class=\"token punctuation\">)<\/span> <span class=\"token number\">0x00000000<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u670d\u52a1\u5668\u7aef\u521d\u59cb\u5316\u4ee3\u7801&#xff1a;<\/span><br \/>\nlocal<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\">\/\/ \u81ea\u52a8\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u7684\u5168 0<\/span><\/p>\n<h5>INADDR_ANY \u7684\u4f18\u52bf\u4e0e\u5e95\u5c42\u539f\u7406<\/h5>\n<ul>\n<li>\u591a\u7f51\u5361\u76d1\u542c&#xff1a;\u4e00\u53f0\u670d\u52a1\u5668\u53ef\u80fd\u6302\u8f7d\u591a\u5757\u7269\u7406\u7f51\u5361\u6216\u865a\u62df\u7f51\u5361&#xff08;\u4f8b\u5982\u62e5\u6709\u5185\u7f51 IP\u3001\u73af\u56de\u5730\u5740 IP \u7b49&#xff09;\u3002\u6307\u5b9a INADDR_ANY \u540e&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4f1a\u76d1\u542c\u5230\u8fbe\u8be5\u4e3b\u673a\u4e0a\u4efb\u610f\u7f51\u5361\u3001\u4e14\u76ee\u6807\u7aef\u53e3\u5339\u914d\u7684\u6240\u6709 UDP \u6570\u636e\u5305\u3002<\/li>\n<li>\u8de8\u7f51\u7edc\u8bbf\u95ee\u901a\u7545&#xff1a;\u65e0\u8bba\u662f\u901a\u8fc7\u5185\u7f51 IP\u3001\u516c\u7f51 IP NAT \u6620\u5c04&#xff0c;\u8fd8\u662f\u901a\u8fc7\u672c\u5730\u73af\u56de\u5730\u5740&#xff08;127.0.0.1&#xff09;\u8bbf\u95ee\u8be5\u7aef\u53e3&#xff0c;\u670d\u52a1\u5668\u5747\u80fd\u6b63\u5e38\u63a5\u6536\u5e76\u54cd\u5e94\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>4.2 \u8f6f\u4ef6\u5206\u5c42\u8bbe\u8ba1&#xff1a;UDP \u670d\u52a1\u4e0e\u4e1a\u52a1\u903b\u8f91\u89e3\u8026<\/h3>\n<p>\u2003\u2003\u5728\u7f16\u5199\u9ad8\u53ef\u9760\u7684\u670d\u52a1\u5668\u7a0b\u5e8f\u65f6&#xff0c;\u7f51\u7edc\u901a\u4fe1\u903b\u8f91&#xff08;\u6536\u53d1\u6570\u636e&#xff09;\u4e0e\u4e0a\u5c42\u4e1a\u52a1\u5904\u7406&#xff08;\u8ba1\u7b97\u3001\u6570\u636e\u5e93\u4ea4\u4e92\u7b49&#xff09;\u5e94\u5f53\u5b9e\u73b0\u89e3\u8026&#xff08;Decoupling&#xff09;\u3002<\/p>\n<h4>4.2.1 \u67b6\u6784\u8bbe\u8ba1\u601d\u60f3<\/h4>\n<p>\u2003\u2003\u670d\u52a1\u5668\u7684\u6838\u5fc3\u5de5\u4f5c\u5faa\u73af\u5206\u4e3a\u4e09\u6b65&#xff1a;<\/p>\n<li>\u63a5\u6536\u6570\u636e&#xff1a;\u901a\u8fc7 recvfrom \u83b7\u53d6\u5ba2\u6237\u7aef\u6570\u636e\u5305\u4ee5\u53ca\u5ba2\u6237\u7aef\u7684 sockaddr_in \u5730\u5740&#xff08;\u5bf9\u7aef\u4fe1\u606f&#xff09;\u3002<\/li>\n<li>\u4e1a\u52a1\u5904\u7406&#xff1a;\u5c06\u63a5\u6536\u5230\u7684\u539f\u59cb\u6570\u636e\u4f20\u9012\u7ed9\u4e0a\u5c42\u56de\u8c03\u51fd\u6570\/\u4e1a\u52a1\u903b\u8f91\u6a21\u5757\u8fdb\u884c\u5904\u7406\u3002<\/li>\n<li>\u54cd\u5e94\u53d1\u9001&#xff1a;\u901a\u8fc7 sendto \u5c06\u4e0a\u5c42\u5904\u7406\u5b8c\u6bd5\u7684\u7ed3\u679c\u53d1\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/li>\n<h4>4.2.2 \u56de\u8c03\u51fd\u6570\u6a21\u5f0f\u5b9e\u73b0<\/h4>\n<p>\u2003\u2003UDP \u670d\u52a1\u5668\u5728\u7c7b\u5b9a\u4e49\u4e2d\u7ef4\u62a4\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61&#xff08;\u5982 std::function&lt;std::string(const std::string&amp;)&gt;&#xff09;&#xff0c;\u5c06\u6570\u636e\u5904\u7406\u7684\u5177\u4f53\u903b\u8f91\u4ea4\u7ed9\u5916\u90e8\u4e0a\u5c42\u4f20\u5165&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;functional&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&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u4e1a\u52a1\u5904\u7406\u51fd\u6570\u7c7b\u578b<\/span><br \/>\n<span class=\"token keyword\">using<\/span> func_t <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>function<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpServer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">UdpServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">,<\/span> func_t func<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_func<\/span><span class=\"token punctuation\">(<\/span>func<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_isrunning<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        _isrunning <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>_isrunning<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> peer<span class=\"token punctuation\">;<\/span><br \/>\n            socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>peer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ 1. \u63a5\u6536\u6d88\u606f<\/span><br \/>\n            ssize_t s <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recvfrom<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                 <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<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>s <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                buffer<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u624b\u52a8\u8865\u5145\u5b57\u7b26\u4e32\u7ed3\u5c3e\u7b26<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>string request <span class=\"token operator\">&#061;<\/span> buffer<span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ 2. \u8f6f\u4ef6\u5206\u5c42&#xff1a;\u4ea4\u7ed9\u4e0a\u5c42\u4e1a\u52a1\u56de\u8c03\u5904\u7406<\/span><br \/>\n                std<span class=\"token double-colon punctuation\">::<\/span>string response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">_func<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ 3. \u53d1\u9001\u54cd\u5e94\u7ed3\u679c\u7ed9\u5ba2\u6237\u7aef<\/span><br \/>\n                <span class=\"token function\">sendto<\/span><span class=\"token punctuation\">(<\/span>_sockfd<span class=\"token punctuation\">,<\/span> response<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> response<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                       <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>peer<span class=\"token punctuation\">,<\/span> len<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><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> _sockfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> _isrunning<span class=\"token punctuation\">;<\/span><br \/>\n    func_t _func<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e0a\u5c42\u56de\u8c03\u51fd\u6570<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>4.3 \u5730\u5740\u8f6c\u6362\u51fd\u6570\u7684\u6f14\u8fdb\u4e0e\u7ebf\u7a0b\u5b89\u5168\u6027\u5206\u6790<\/h3>\n<p>\u2003\u2003\u5728\u5904\u7406 IP \u5730\u5740\u7684\u5b57\u7b26\u4e32\u683c\u5f0f&#xff08;\u70b9\u5206\u5341\u8fdb\u5236&#xff0c;\u5982 &#034;192.168.1.1&#034;&#xff09;\u4e0e\u7f51\u7edc\u5b57\u8282\u5e8f\u4e8c\u8fdb\u5236\u6574\u6570&#xff08;in_addr_t&#xff09;\u4e4b\u95f4\u7684\u8f6c\u6362\u65f6&#xff0c;Linux C API \u7ecf\u5386\u4e86\u4ece\u4f20\u7edf\u65e7 API \u5230\u73b0\u4ee3\u5316 POSIX API \u7684\u6f14\u8fdb\u3002<\/p>\n<p>[\u5b57\u7b26\u4e32 IP &#034;192.168.1.1&#034;]  \u2500\u2500inet_pton \/ inet_addr\u2500\u2500&gt;  [\u7f51\u7edc\u5b57\u8282\u5e8f 32\u4f4d\u6574\u6570]<br \/>\n[\u5b57\u7b26\u4e32 IP &#034;192.168.1.1&#034;]  &lt;\u2500\u2500inet_ntop \/ inet_ntoa\u2500\u2500  [\u7f51\u7edc\u5b57\u8282\u5e8f 32\u4f4d\u6574\u6570]<\/p>\n<h4>4.3.1 \u65e7\u7248 API \u53ca\u5176\u7f3a\u9677<\/h4>\n<h5>1. inet_addr<\/h5>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u5c06\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a in_addr_t\u3002<\/li>\n<li>\u5c40\u9650&#xff1a;\u4ec5\u652f\u6301 IPv4&#xff1b;\u5904\u7406\u5e7f\u64ad\u5730\u5740 255.255.255.255 \u65f6\u7531\u4e8e\u8fd4\u56de -1&#xff08;\u5373 INADDR_NONE&#xff09;&#xff0c;\u4f1a\u5bfc\u81f4\u6b67\u4e49\u4e0e\u9519\u8bef\u5904\u7406\u56f0\u96be\u3002<\/li>\n<\/ul>\n<h5>2. inet_ntoa \u4e0e\u7ebf\u7a0b\u5b89\u5168\u9690\u60a3<\/h5>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u5c06 4 \u5b57\u8282\u7f51\u7edc\u5b57\u8282\u5e8f IP \u8f6c\u6362\u4e3a\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u81f4\u547d\u7f3a\u9677&#xff08;\u7ebf\u7a0b\u4e0d\u5b89\u5168&#xff09;&#xff1a;inet_ntoa \u5185\u90e8\u4f7f\u7528\u4e86\u4e00\u4e2a**\u9759\u6001\u5c40\u90e8\u7f13\u51b2\u533a&#xff08;static buffer&#xff09;**\u6765\u4fdd\u5b58\u8f6c\u6362\u540e\u7684\u5b57\u7b26\u4e32\u3002\u5728\u591a\u7ebf\u7a0b\u5e76\u53d1\u73af\u5883\u4e0b&#xff0c;\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528 inet_ntoa&#xff0c;\u540e\u7eed\u7ebf\u7a0b\u7684\u8f6c\u6362\u7ed3\u679c\u4f1a\u8986\u76d6\u4e4b\u524d\u7ebf\u7a0b\u7f13\u5b58\u5728\u9759\u6001\u533a\u4e2d\u7684 IP \u5b57\u7b26\u4e32&#xff0c;\u5f15\u53d1\u4e25\u91cd\u7684\u5e76\u53d1\u6570\u636e\u7ade\u4e89\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h4>4.3.2 \u73b0\u4ee3\u5316\u7ebf\u7a0b\u5b89\u5168 API&#xff1a;inet_pton \u4e0e inet_ntop<\/h4>\n<p>\u2003\u2003\u73b0\u4ee3\u7f51\u7edc\u7f16\u7a0b\u63a8\u8350\u4f7f\u7528 inet_pton (Presentation to Network) \u4e0e inet_ntop (Network to Presentation)\u3002<\/p>\n<h5>API \u63a5\u53e3\u58f0\u660e<\/h5>\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><\/p>\n<p><span class=\"token comment\">\/\/ \u5b57\u7b26\u4e32 IP -&gt; \u4e8c\u8fdb\u5236\u7f51\u7edc\u5b57\u8282\u5e8f IP<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> af<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>dst<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e8c\u8fdb\u5236\u7f51\u7edc\u5b57\u8282\u5e8f IP -&gt; \u5b57\u7b26\u4e32 IP<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> af<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>dst<span class=\"token punctuation\">,<\/span> socklen_t size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u652f\u6301\u534f\u8bae\u65cf&#xff1a;\u7b2c\u4e00\u4e2a\u53c2\u6570 af \u53ef\u663e\u5f0f\u6307\u5b9a AF_INET (IPv4) \u6216 AF_INET6 (IPv6)\u3002<\/li>\n<li>\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168&#xff1a;inet_ntop \u8981\u6c42\u8c03\u7528\u8005\u663e\u5f0f\u4f20\u5165\u4e00\u4e2a\u7531\u8c03\u7528\u65b9\u7ef4\u62a4\u7684\u5185\u5b58\u7f13\u51b2\u533a\u6307\u9488&#xff08;\u5982\u6808\u4e0a\u5206\u914d\u7684 char ipbuffer[64]&#xff09;&#xff0c;\u907f\u514d\u4e86\u5185\u90e8\u9759\u6001\u7f13\u51b2\u533a\u7684\u4f9d\u8d56&#xff0c;\u6bcf\u4e2a\u7ebf\u7a0b\u5728\u81ea\u5df1\u7684\u6808\u5e27\u7a7a\u95f4\u4e2d\u64cd\u4f5c&#xff0c;\u4ece\u6839\u672c\u4e0a\u6d88\u9664\u4e86\u7ebf\u7a0b\u5b89\u5168\u9690\u60a3\u3002<\/li>\n<\/ul>\n<h5>\u5c01\u88c5\u73b0\u4ee3 IP \u5730\u5740\u8f6c\u6362\u7c7b\u793a\u4f8b<\/h5>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">InetAddr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4ece sockaddr_in \u7ed3\u6784\u63d0\u53d6 IP \u548c\u7aef\u53e3<\/span><br \/>\n    <span class=\"token function\">InetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_addr<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        _port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>_addr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u663e\u5f0f\u5728\u6808\u4e0a\u521b\u5efa\u7f13\u51b2\u533a&#xff0c;\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684 inet_ntop<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> ipbuffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">64<\/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>_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">,<\/span> ipbuffer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>ipbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _ip <span class=\"token operator\">&#061;<\/span> ipbuffer<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ece IP \u548c Port \u6784\u5efa sockaddr_in \u7ed3\u6784<\/span><br \/>\n    <span class=\"token function\">InetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token operator\">&amp;<\/span>ip<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">_ip<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">_port<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>_addr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n        _addr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684 inet_pton<\/span><br \/>\n        <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> _ip<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>_addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token function\">Ip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _ip<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> <span class=\"token function\">Port<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _port<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> <span class=\"token function\">GetAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> _addr<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> _addr<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string _ip<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">uint16_t<\/span> _port<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2003\u2003\u4f7f\u7528 inet_pton \u548c inet_ntop \u642d\u914d\u6808\u7f13\u51b2\u533a\u6216\u5c01\u88c5\u7c7b&#xff0c;\u65e2\u80fd\u5b8c\u7f8e\u652f\u6301 IPv4\/IPv6 \u6269\u5c55&#xff0c;\u53c8\u80fd\u786e\u4fdd\u591a\u7ebf\u7a0b\u9ad8\u5e76\u53d1\u5e94\u7528\u4e0b\u7684\u7edd\u5bf9\u5b89\u5168\u3002<\/p>\n<h2>\u4e94\u3001\u9644\u4e0a\u6e90\u7801<\/h2>\n<p>\u2003\u2003\u90fd\u662f\u624b\u5199\u4ee3\u7801&#xff0c;\u53ef\u80fd\u4f1a\u6709bug&#xff0c;\u5982\u679c\u6709&#xff0c;\u975e\u5e38\u6b22\u8fce\u5927\u4f6c\u6307\u51fa\u79c1\u4fe1\u3002\u91cf\u771f\u7684\u592a\u5927\u4e86&#xff0c;\u6211\u628a\u4ed3\u5e93\u8d34\u4e00\u4e0b&#xff1a;&#xff08;\u76ee\u524d\u4ed3\u5e93\u8fd8\u5728\u5efa\u8bbe\u4e2d&#xff0c;Readme\u8fd8\u6ca1\u6709\u5199\u3002&#xff09;Konata\u2019s Network-Programming  <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260908031352-6a9f7d7011a9c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<p> <b>\u597d\u7684\u672c\u671f\u5185\u5bb9\u5c31\u5230\u8fd9\u91cc&#xff0c;\u5982\u679c\u5bf9\u4f60\u6709\u5e2e\u52a9&#xff0c;\u8fd8\u4e0d\u8981\u5fd8\u8bb0\u70b9\u8d5e\u4e09\u8054\u652f\u6301\u3002\u6211\u662f\u6b64\u65b9&#xff0c;\u6211\u4eec\u4e0b\u671f\u518d\u89c1\u3002bye! Linux\u3001C&#043;&#043;\u3001\u7b97\u6cd5\u6301\u7eed\u8fde\u8f7d\u4e2d&#xff0c;\u6b22\u8fce\u5173\u6ce8WeChat Official Account \u3010\u6b64\u65b9\u7684\u6280\u672f\u6808\u3011\u3002<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u25c6 \u535a\u4e3b\u540d\u79f0&#xff1a; \u5c0f\u6b64\u65b9-CSDN\u535a\u5ba2 \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u5c0f\u6b64\u65b9\u7684\u535a\u5ba2\u3002 \u2b50\ufe0f\u7f51\u7edc\u7cfb\u5217\u4e2a\u4eba\u4e13\u680f&#xff1a; \u3010\u4e3b\u9898\u66f2\u3011\u8ba1\u7b97\u673a\u7f51\u7edc \u2b50\ufe0f\u6b64\u65b9\u7684GitHub&#xff1a; github_\u6b64\u65b9  \u2b50\ufe0f\u6211\u4eec\u601d\u8003 (Rethink) \u00b7 \u6211\u4eec\u91cd\u5efa (Rebuild) \u00b7 \u6211\u4eec\u8bb0\u5f55 (Record) \u6587\u7ae0\u76ee\u5f55\u6982\u8981&amp;\u5e8f\u8ad6\u4e00\u3001UDP \u5957\u63a5\u5b57\u7f16\u7a0b\u57fa\u7840\u4e0e\u6838\u5fc3 API \u8be6\u89e31.1 \u5957\u63a5\u5b57\u57fa\u7840\u6982\u5ff5\u4e0e\u5e38\u7528\u5934\u6587\u4ef61.2 \u521b\u5efa\u5957\u63a5\u5b57&#xff1a;socket \u51fd\u65701.2.1<\/p>\n","protected":false},"author":2,"featured_media":102288,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,193,78],"topic":[],"class_list":["post-102290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-udp","tag-78"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/102290.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u25c6 \u535a\u4e3b\u540d\u79f0&#xff1a; \u5c0f\u6b64\u65b9-CSDN\u535a\u5ba2 \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u5c0f\u6b64\u65b9\u7684\u535a\u5ba2\u3002 \u2b50\ufe0f\u7f51\u7edc\u7cfb\u5217\u4e2a\u4eba\u4e13\u680f&#xff1a; \u3010\u4e3b\u9898\u66f2\u3011\u8ba1\u7b97\u673a\u7f51\u7edc \u2b50\ufe0f\u6b64\u65b9\u7684GitHub&#xff1a; github_\u6b64\u65b9 \u2b50\ufe0f\u6211\u4eec\u601d\u8003 (Rethink) \u00b7 \u6211\u4eec\u91cd\u5efa (Rebuild) \u00b7 \u6211\u4eec\u8bb0\u5f55 (Record) \u6587\u7ae0\u76ee\u5f55\u6982\u8981&amp;\u5e8f\u8ad6\u4e00\u3001UDP \u5957\u63a5\u5b57\u7f16\u7a0b\u57fa\u7840\u4e0e\u6838\u5fc3 API \u8be6\u89e31.1 \u5957\u63a5\u5b57\u57fa\u7840\u6982\u5ff5\u4e0e\u5e38\u7528\u5934\u6587\u4ef61.2 \u521b\u5efa\u5957\u63a5\u5b57&#xff1a;socket \u51fd\u65701.2.1\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/102290.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-08T03:13:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260908031351-6a9f7d6f8fc4f.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/102290.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/102290.html\",\"name\":\"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-09-08T03:13:53+00:00\",\"dateModified\":\"2026-09-08T03:13:53+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/102290.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/102290.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/102290.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/102290.html","og_locale":"zh_CN","og_type":"article","og_title":"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u25c6 \u535a\u4e3b\u540d\u79f0&#xff1a; \u5c0f\u6b64\u65b9-CSDN\u535a\u5ba2 \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u5c0f\u6b64\u65b9\u7684\u535a\u5ba2\u3002 \u2b50\ufe0f\u7f51\u7edc\u7cfb\u5217\u4e2a\u4eba\u4e13\u680f&#xff1a; \u3010\u4e3b\u9898\u66f2\u3011\u8ba1\u7b97\u673a\u7f51\u7edc \u2b50\ufe0f\u6b64\u65b9\u7684GitHub&#xff1a; github_\u6b64\u65b9 \u2b50\ufe0f\u6211\u4eec\u601d\u8003 (Rethink) \u00b7 \u6211\u4eec\u91cd\u5efa (Rebuild) \u00b7 \u6211\u4eec\u8bb0\u5f55 (Record) \u6587\u7ae0\u76ee\u5f55\u6982\u8981&amp;\u5e8f\u8ad6\u4e00\u3001UDP \u5957\u63a5\u5b57\u7f16\u7a0b\u57fa\u7840\u4e0e\u6838\u5fc3 API \u8be6\u89e31.1 \u5957\u63a5\u5b57\u57fa\u7840\u6982\u5ff5\u4e0e\u5e38\u7528\u5934\u6587\u4ef61.2 \u521b\u5efa\u5957\u63a5\u5b57&#xff1a;socket \u51fd\u65701.2.1","og_url":"https:\/\/www.wsisp.com\/helps\/102290.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-09-08T03:13:53+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260908031351-6a9f7d6f8fc4f.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"8 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/102290.html","url":"https:\/\/www.wsisp.com\/helps\/102290.html","name":"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-09-08T03:13:53+00:00","dateModified":"2026-09-08T03:13:53+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/102290.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/102290.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/102290.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"Linux\u7f51\u7edc\uff08\u4e94\uff09\uff1a\u4e00\u6587\u5403\u900f UDP Socket \u7f16\u7a0b\uff1a\u4ece socket\u3001bind \u5230\u6570\u636e\u6536\u53d1\u4e0e\u5730\u5740\u5904\u7406"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=102290"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102290\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/102288"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=102290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=102290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=102290"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=102290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}