{"id":1238,"date":"2024-09-25T11:25:56","date_gmt":"2024-09-25T03:25:56","guid":{"rendered":"http:\/\/114.55.108.251\/?p=1238"},"modified":"2025-03-04T09:46:00","modified_gmt":"2025-03-04T01:46:00","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-part2-socket%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=1238","title":{"rendered":"Linux\u7f51\u7edc\u7f16\u7a0b Part2 Socket\u7f16\u7a0b"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u9884\u5907\u77e5\u8bc6<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f51\u7edc\u5957\u63a5\u5b57socket<\/h4>\n\n\n\n<p>\u5c5e\u4e8eLinux\u7279\u6b8a\u6587\u4ef6\u7c7b\u578b\uff08\u7ba1\u9053\u3001\u5957\u63a5\u5b57\u3001\u5b57\u7b26\u8bbe\u5907\u3001\u5757\u8bbe\u5907\uff09<\/p>\n\n\n\n<p>\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6307\u5411\u4e00\u4e2a\u5957\u63a5\u5b57(\u8be5\u5957\u63a5\u5b57\u5185\u90e8\u7531\u5185\u6838\u501f\u52a9\u4e24\u4e2a\u7f13\u51b2\u533a\u5b9e\u73b0)<\/p>\n\n\n\n<p>\u5728\u901a\u4fe1\u8fc7\u7a0b\u4e2d\uff0c \u5957\u63a5\u5b57\u4e00\u5b9a\u662f\u6210\u5bf9\u51fa\u73b0\u7684<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730347400874.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"818\" height=\"316\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730347400874.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1290\"  sizes=\"auto, (max-width: 818px) 100vw, 818px\" \/><\/div><\/figure>\n\n\n\n<p>\u7c7b\u6bd4\u524d\u9762\u8fdb\u7a0b\u901a\u4fe1\u4e2d\u7684\u7ba1\u9053\uff1a\u4e00\u4e2a\u7ba1\u9053\u638c\u63a7\u7740\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u548c\u4e00\u4e2a\u7f13\u51b2\u533a\uff0c\u800c\u4e00\u4e2a\u5957\u63a5\u5b57\u638c\u63a7\u7740\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u548c\u4e24\u4e2a\u7f13\u51b2\u533a<\/p>\n\n\n\n<p>ps\uff1a\u56fe\u4e2d\u753b\u7684\u4e0d\u6070\u5f53\uff0c\u6570\u636e\u6d41\u901a\u5e76\u4e0d\u662f\u4ece\u4e00\u4e2a\u5957\u63a5\u5b57\u7684\u53d1\u9001\u7aef\u5230\u53e6\u4e00\u4e2a\u5957\u63a5\u5b57\u7684\u63a5\u6536\u7aef\uff0c\u800c\u662f\u4ece\u4e00\u4e2a\u5957\u63a5\u5b57\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6d41\u5411\u53e6\u4e00\u4e2a\u5957\u63a5\u5b57\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<p><a href=\"http:\/\/114.55.108.251\/wp-admin\/edit.php?post_type=post\"><\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f51\u7edc\u5b57\u8282\u5e8f<\/h4>\n<\/div>\n\n\n\n<p>\u5c0f\u7aef\u6cd5\uff1a(pc\u672c\u5730\u5b58\u50a8) \u9ad8\u4f4d\u5b58\u9ad8\u5730\u5740\uff0c\u4f4e\u4f4d\u5b58\u4f4e\u5730\u5740 <\/p>\n\n\n\n<p>\u5927\u7aef\u6cd5\uff1a(\u7f51\u7edc\u5b58\u50a8) \u9ad8\u4f4d\u5b58\u4f4e\u5730\u5740\uff0c\u4f4e\u4f4d\u5b58\u9ad8\u5730\u5740\uff08\u66f4\u7b26\u5408\u4eba\u7c7b\u9605\u8bfb\u4e60\u60ef\uff0c\u6bd4\u5982\u6570\u5b57\u9ad8\u4f4d\u5728\u524d\uff09<\/p>\n\n\n\n<p>\u56e0\u6b64\u4e3a\u4f7f\u7f51\u7edc\u7a0b\u5e8f\u5177\u6709\u53ef\u79fb\u690d\u6027\uff0c\u8981\u8c03\u7528\u4ee5\u4e0b\u51fd\u6570\u505a\u7f51\u7edc\u5b57\u8282\u5e8f\u548c\u4e3b\u673a\u5b57\u8282\u5e8f\u7684\u8f6c\u6362\uff1a<\/p>\n\n\n\n<p><code>htonl<\/code>\uff1a\u672c\u5730\u2192\u7f51\u7edc\uff08\u9488\u5bf9IP\uff09\u8f6c\u6362\u8fc7\u7a0b\uff1a192.168.1.11\u2192string\u2192atoi\u2192int\u2192htonl\u2192\u7f51\u7edc\u5b57\u8282\u5e8f<\/p>\n\n\n\n<p><code>htons<\/code>\uff1a\u672c\u5730\u2192\u7f51\u7edc (port)<\/p>\n\n\n\n<p><code>ntohl<\/code>\uff1a\u7f51\u7edc\u2192\u672c\u5730\uff08IP\uff09<\/p>\n\n\n\n<p><code>ntohs<\/code>\uff1a\u7f51\u7edc\u2192\u672c\u5730\uff08Port\uff09<\/p>\n\n\n\n<p>ps\uff1ah\u4ee3\u8868host\u3001n\u4ee3\u8868network\u3001l\u4ee3\u886832\u4f4d\u957fint\u7528\u4e8eIP\u3001s\u4ee3\u886816\u4f4d\u77edint\u7528\u4e8e\u7aef\u53e3\u3001\u51fd\u6570\u540d\u4e2d\u95f4\u662fto<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">IP\u5730\u5740\u8f6c\u6362\u51fd\u6570 <\/h4>\n\n\n\n<p>\u901a\u8fc7\u5c01\u88c5\u7684\u51fd\u6570\u76f4\u63a5\u5b9e\u73b0\u9488\u5bf9<strong>IP\u5730\u5740<\/strong>\u7684\u5b57\u8282\u5e8f\u95f4\u7684\u8f6c\u6362<\/p>\n\n\n\n<p><code>int inet_pton(int af, const char *src, void *dst);<\/code> \u672c\u5730\u5b57\u8282\u5e8f(string IP)\u2192\u7f51\u7edc\u5b57\u8282\u5e8f\uff0c\u4e00\u822c\u7528\u4e8e\u5ba2\u6237\u7aef\u7ed1\u5b9a\u670d\u52a1\u5668\u7684\u65f6\u5019<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>af\uff1aAF_INET(\u6307IPv4)\u3001AF_INET6(\u6307IPv6)<\/li>\n\n\n\n<li>src\uff1a\u4f20\u5165\u53c2\u6570\uff0cIP\u5730\u5740(\u70b9\u5206\u5341\u8fdb\u5236)<\/li>\n\n\n\n<li>dst\uff1a\u4f20\u51fa\u53c2\u6570\uff0c\u8f6c\u6362\u540e\u7684\u7f51\u7edc\u5b57\u8282\u5e8f\u7684IP\u5730\u5740<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a 1<\/li>\n\n\n\n<li>\u5931\u8d25\uff1a-1\uff0cerrno<\/li>\n\n\n\n<li>\u5f02\u5e38\uff1a 0\uff08\u8bf4\u660esrc\u6307\u5411\u7684\u4e0d\u662f\u4e00\u4e2a\u6709\u6548\u7684IP\u5730\u5740\uff09<\/li>\n<\/ul>\n\n\n\n<p><code>const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);<\/code> \u7f51\u7edc\u5b57\u8282\u5e8f\u2192\u672c\u5730\u5b57\u8282\u5e8f(string IP)\uff0c\u4e00\u822c\u7528\u4e8e<code>accept<\/code>\u51fd\u6570<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>af\uff1aAF_INET(\u6307IPv4)\u3001AF_INET6(\u6307IPv6)<\/li>\n\n\n\n<li>src\uff1a\u4f20\u5165\u53c2\u6570\uff0c\u7f51\u7edc\u5b57\u8282\u5e8fIP\u5730\u5740<\/li>\n\n\n\n<li>dst\uff1a\u4f20\u51fa\u53c2\u6570\uff0c\u8f6c\u6362\u540e\u7684\u672c\u5730\u5b57\u8282\u5e8f(string IP)<\/li>\n\n\n\n<li>size\uff1a\u7f13\u51b2\u533adst\u7684\u5927\u5c0f<br><\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1adst<\/li>\n\n\n\n<li>\u5931\u8d25\uff1aNULL<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">sockaddr\u5730\u5740\u7ed3\u6784<\/h4>\n\n\n\n<p>IP + port \u2192 \u5728\u7f51\u7edc\u73af\u5883\u4e2d\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u8fdb\u7a0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730806662151.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"500\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730806662151.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1302\"  sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730806775527.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"582\" height=\"111\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730806775527.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1303\"  sizes=\"auto, (max-width: 582px) 100vw, 582px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730807007465.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"603\" height=\"95\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730807007465.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1304\"  sizes=\"auto, (max-width: 603px) 100vw, 603px\" \/><\/div><\/figure>\n\n\n\n<p>ps\uff1a\u67e5\u8be2\u6587\u6863 man 7 ip<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">struct sockaddr_in addr; \/\/\u5b9a\u4e49\u73b0\u5728\u6709\u6548\u7684\u7c7b\u578b  <br>\/\/\u521d\u59cb\u5316sockaddr\u7ed3\u6784\u4f53<br><strong>addr.sin_family<\/strong> = AF_INET; \/\/\u6307\u5b9a\u5730\u5740\u65cf(IPv4\u62166)\t\t <br><strong>addr.sin_port<\/strong> = htons(9527); \/\/\u6307\u5b9a\u7aef\u53e3\u53f7(\u8f6c\u5316\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f)<br><br>\/\/\u5bf9\u7b2c\u4e09\u4e2a\u6210\u5458\u521d\u59cb\u5316\u6709\u4e0b\u5217\u4e24\u79cd\u65b9\u5f0f<br>\u2460\u6307\u5b9aIP\u5730\u5740\uff08\u4e00\u822c\u7528\u4e8e\u5ba2\u6237\u7aef\uff09\t\t<br>inet_pton(AF_INET, \"192.157.22.45\", &amp;addr.sin_addr.s_addr);<br>\u2461\u81ea\u52a8\u53d6\u51fa\u7cfb\u7edf\u4e2d\u6709\u6548\u7684\u4efb\u610fIP\u5730\u5740\uff08\u4e00\u822c\u7528\u4e8e\u670d\u52a1\u5668\uff09<br><strong>addr.sin_addr.s_addr<\/strong> = htonl(INADDR_ANY); <br><br>bind(fd, (struct sockaddr *)&amp;addr, size); \/\/\u8c03\u7528\u51fd\u6570\u65f6\u518d\u5f3a\u8f6c\u4e3a\u51fd\u6570\u6240\u9700\u7c7b\u578b\uff08\u56e0\u4e3a\u51fd\u6570\u5f88\u8001\u4e86\uff09<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u203bread\u51fd\u6570\u8fd4\u56de\u503c\u8ba8\u8bba<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uff1e0\uff1a\u5b9e\u9645\u8bfb\u5230\u7684\u5b57\u8282\u6570<\/li>\n\n\n\n<li><strong><em>= 0\uff1a<strong><em>\uff08\u8868\u793a\u5bf9\u7aef\u5148\u5173\u95ed\u8fde\u63a5\uff09<\/em><\/strong>\u5df2\u7ecf\u8bfb\u5230\u7ed3\u5c3e\uff0c\u53ef\u4ee5\u8c03close()\u51fd\u6570\u4e86<\/em><\/strong><\/li>\n\n\n\n<li>-1\uff1a\u5e94\u8fdb\u4e00\u6b65\u5224\u65aderror\u7684\u503c\n<ul class=\"wp-block-list\">\n<li>errno == EAGAIN\u6216EWOULDBLOCK\uff1a\u8bbe\u7f6e\u4e86\u975e\u963b\u585e\u65b9\u5f0f\u8bfb\uff0c\u4f46\u6ca1\u6709\u6570\u636e\u5230\u8fbe(\u9700\u8981\u518d\u6b21\u8bfb)<\/li>\n\n\n\n<li>errno == EINTR\uff1a\u6162\u901f\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad(\u9700\u8981\u91cd\u542f)<\/li>\n\n\n\n<li>errno == ECONNRESET\uff1a\u8fde\u63a5\u88ab\u91cd\u7f6e(\u9700\u8981close()\uff0c\u79fb\u9664\u76d1\u542c\u961f\u5217)<\/li>\n\n\n\n<li>errno == \u5176\u4ed6\u60c5\u51b5\uff1a\u5f02\u5e38<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7f51\u7edc\u5957\u63a5\u5b57\u51fd\u6570<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">socket\u6a21\u578b\u521b\u5efa\u6d41\u7a0b\u56fe<\/h4>\n\n\n\n<p> \u4e00\u4e2a\u5ba2\u6237\u7aef\u548c\u4e00\u4e2a\u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1\uff0c\u9700\u8981\u521b\u5efa<strong>\u4e09\u4e2a<\/strong>\u5957\u63a5\u5b57<\/p>\n\n\n\n<p>\u5176\u4e2d\u4e24\u4e2a\u5c5e\u4e8e\u670d\u52a1\u5668\uff08\u4e00\u4e2a\u7528\u4e8e\u76d1\u542c\uff0c\u4e00\u4e2a\u7528\u4e8e\u901a\u4fe1\uff09\uff0c\u4e00\u4e2a\u5c5e\u4e8e\u5ba2\u6237\u7aef\uff08\u7528\u4e8e\u901a\u4fe1\uff09<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730293417492.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"538\" height=\"520\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1730293417492.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1281\"  sizes=\"auto, (max-width: 538px) 100vw, 538px\" \/><\/div><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\">socket\u51fd\u6570<\/h4>\n\n\n\n<p>\u5934\u6587\u4ef6\uff1a<code>#include&lt;sys\/socket.h&gt;<\/code><\/p>\n\n\n\n<p><code>int socket(int domain, int type, int protocol);<\/code> \/\/\u521b\u5efa\u4e00\u4e2a\u5957\u63a5\u5b57<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>domain\uff1aAF_INET\u3001AF_INET6\u3001AF_UNIX  \/\/\u6307\u5b9a\u9009\u7528\u7684IP\u5730\u5740\u534f\u8bae<\/li>\n\n\n\n<li>type\uff1aSOCK_STREAM\u3001SOCK_DGRAM \/\/\u6307\u5b9a\u6570\u636e\u4f20\u8f93\u534f\u8bae\uff1a\u6d41\u5f0f\u534f\u8bae\/\u62a5\u5f0f\u534f\u8bae<\/li>\n\n\n\n<li>protocol\uff1a0 \/\/\u8868\u793a\u6240\u9009\u62e9\u7684\u4f20\u8f93\u534f\u8bae\u7684\u4ee3\u8868\u534f\u8bae\uff0c\u90090\u5c31\u4ee3\u8868\u6839\u636e\u524d\u9762\u6307\u5b9a\u7684\u4f20\u8f93\u534f\u8bae\u81ea\u52a8\u9009\u62e9\u5176\u4ee3\u8868\u534f\u8bae\uff08\u6d41\u5f0f\u534f\u8bae\u7684\u4ee3\u8868\u534f\u8bae\u662fTCP\uff0c\u62a5\u5f0f\u534f\u8bae\u7684\u4ee3\u8868\u534f\u8bae\u662fUDP\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a\u65b0\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n\n\n\n<li>\u5931\u8d25: -1\uff0cerrno<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">bind\u51fd\u6570<\/h4>\n\n\n\n<p>\u5934\u6587\u4ef6\uff1a<code>#include&lt;arpa\/inet.h&gt;<\/code><\/p>\n\n\n\n<p><code>int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen)<\/code>; \u7ed9socket\u7ed1\u5b9a\u4e00\u4e2a\u5730\u5740\u7ed3\u6784(IP+port)<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sockfd\uff1a\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5373socket\u51fd\u6570\u8fd4\u56de\u503c <\/li>\n\n\n\n<li>addr\uff1a\u4f20\u5165\u53c2\u6570(struct sockaddr *)&amp;addr \u5730\u5740\u7ed3\u6784\uff0c\u6ce8\u610f\u8981\u5f3a\u8f6c\u4e3a<code>struct sockaddr *<\/code>\u7c7b\u578b\n<ul class=\"wp-block-list\">\n<li>struct sockaddr_in addr;<\/li>\n\n\n\n<li>addr.sin_family = AF_INET;<\/li>\n\n\n\n<li>addr.sin_port = htons(8888);<\/li>\n\n\n\n<li>addr.sin_addr.s_addr = htonl(INADDR_ANY);<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>addrlen\uff1asizeof(addr) \u5730\u5740\u7ed3\u6784\u7684\u5927\u5c0f <\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a0<\/li>\n\n\n\n<li>\u5931\u8d25\uff1a-1\uff0cerrno<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">listen\u51fd\u6570<\/h4>\n\n\n\n<p><code>int listen(int sockfd, int backlog);<\/code> \u8bbe\u7f6e\u540c\u65f6\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5\u7684<strong>\u4e0a\u9650<\/strong>\u6570\uff08\u5373\u540c\u65f6\u8fdb\u884c3\u6b21\u63e1\u624b\u7684\u5ba2\u6237\u7aef\u6570\u91cf\uff09<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sockfd\uff1a\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5373socket\u51fd\u6570\u8fd4\u56de\u503c <\/li>\n\n\n\n<li>backlog\uff1a\u4e0a\u9650\u6570\u503c(\u6700\u5927\u503c\u4e3a128)<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a0<\/li>\n\n\n\n<li>\u5931\u8d25\uff1a-1\uff0cerrno\t<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">accept\u51fd\u6570<\/h4>\n\n\n\n<p><code>int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/code> <strong>\u963b\u585e\u7b49\u5f85<\/strong>\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\uff0c\u6210\u529f\u5219<strong>\u8fd4\u56de\u4e00\u4e2a\u4e0e\u5ba2\u6237\u7aef\u6210\u529f\u8fde\u63a5\u7684\u670d\u52a1\u5668\u7684socket\u6587\u4ef6\u63cf\u8ff0\u7b26<\/strong><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sockfd\uff1a\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5373socket\u51fd\u6570\u8fd4\u56de\u503c <\/li>\n\n\n\n<li>addr\uff1a\u4f20\u51fa\u53c2\u6570\uff0c\u6210\u529f\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5\u7528\u4e8e\u901a\u4fe1\u7684\u90a3\u4e2a<strong>\u5ba2\u6237\u7aef\u7684\u5730\u5740\u7ed3\u6784<\/strong>\uff08IP+port\uff09<\/li>\n\n\n\n<li>addrlen\uff1a\u4f20\u5165\u4f20\u51fa\u53c2\u6570 \n<ul class=\"wp-block-list\">\n<li>\u5165\uff1aaddr\u7684\u5927\u5c0f<\/li>\n\n\n\n<li>\u51fa\uff1a\u5ba2\u6237\u7aefaddr\u7684\u5b9e\u9645\u5927\u5c0f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a\u80fd\u4e0e\u5ba2\u6237\u7aef\u8fdb\u884c\u6570\u636e\u901a\u4fe1\u7684socket\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n\n\n\n<li>\u5931\u8d25\uff1a-1\uff0cerrno<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">connect\u51fd\u6570<\/h4>\n\n\n\n<p><code>int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/code> \u4f7f\u7528\u73b0\u6709\u7684socket<strong>\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5<\/strong><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sockfd\uff1a\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5373socket\u51fd\u6570\u8fd4\u56de\u503c <\/li>\n\n\n\n<li>struct sockaddr_in srv_addr; \u4f20\u5165\u53c2\u6570\uff0c\u670d\u52a1\u5668\u7684\u5730\u5740\u7ed3\u6784\n<ul class=\"wp-block-list\">\n<li>srv_addr.sin_family = AF_INET;<\/li>\n\n\n\n<li>srv_addr.sin_port = 9527 \u8ddf\u670d\u52a1\u5668bind\u65f6\u8bbe\u5b9a\u7684 port \u5b8c\u5168\u4e00\u81f4<\/li>\n\n\n\n<li>inet_pton(AF_INET, &#8220;\u670d\u52a1\u5668\u7684IP\u5730\u5740&#8221;\uff0c&amp;srv_adrr.sin_addr.s_addr);<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>addrlen\uff1a\u670d\u52a1\u5668\u7684\u5730\u5740\u7ed3\u6784\u5927\u5c0f<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6210\u529f\uff1a0<\/li>\n\n\n\n<li>\u5931\u8d25\uff1a-1\uff0cerrno<\/li>\n<\/ul>\n\n\n\n<p>ps\uff1a\u5982\u679c\u4e0d\u4f7f\u7528<code>bind<\/code>\u51fd\u6570\u7ed1\u5b9a\u5ba2\u6237\u7aef\u5730\u5740\u7ed3\u6784\uff0c\u5219\u9ed8\u8ba4\u91c7\u7528&#8221;\u9690\u5f0f\u7ed1\u5b9a&#8221;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">C\/S\u6a21\u578b-TCP<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1731064057367.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"717\" height=\"605\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1731064057367.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1417\"  sizes=\"auto, (max-width: 717px) 100vw, 717px\" \/><\/div><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\">TCP\u901a\u4fe1\u6d41\u7a0b\u5206\u6790<\/h4>\n\n\n\n<p>\u670d\u52a1\u5668server\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>socket() \u521b\u5efasocket<\/li>\n\n\n\n<li>bind() \u7ed1\u5b9a\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784<\/li>\n\n\n\n<li>listen() \u8bbe\u7f6e\u76d1\u542c\u4e0a\u9650<\/li>\n\n\n\n<li>accept() \u963b\u585e\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5<\/li>\n\n\n\n<li>read(fd) \u8bfbsocket\u83b7\u53d6\u5ba2\u6237\u7aef\u6570\u636e<\/li>\n\n\n\n<li>toupper() \u5c0f\u2192\u5927\u5199\uff08\u5373\u5177\u4f53\u5904\u7406\u4e8b\u52a1\uff09<\/li>\n\n\n\n<li>write(fd) \u518d\u7531\u540c\u4e00\u4e2asocket\u5411\u5ba2\u6237\u7aef\u5199<\/li>\n\n\n\n<li>close();<\/li>\n<\/ol>\n\n\n\n<p>\u5ba2\u6237\u7aefclient\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>socket() \u521b\u5efasocket<\/li>\n\n\n\n<li>connect(); \u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5<\/li>\n\n\n\n<li>write() \u5199\u6570\u636e\u5230socket<\/li>\n\n\n\n<li>read() \u8bfb\u5904\u7406\u540e\u7684\u6570\u636e<\/li>\n\n\n\n<li>\u5904\u7406\u8bfb\u53d6\u6570\u636e<\/li>\n\n\n\n<li>close()<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">\u203b\u7f16\u7a0b\u7ec3\u4e60\uff1a\u5b9e\u73b0TCP\u901a\u4fe1<\/h4>\n\n\n\n<p><strong><em>server\uff1a<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;stdio.h&gt;\n#include&lt;stdlib.h&gt;\n#include&lt;string.h&gt;\n#include&lt;fcntl.h&gt;\n#include&lt;unistd.h&gt;\n#include&lt;pthread.h&gt;\n#include&lt;sys\/stat.h&gt;\n#include&lt;sys\/mman.h&gt;\n#include&lt;dirent.h&gt;\n#include&lt;errno.h&gt;\n#include&lt;signal.h&gt;\n#include&lt;sys\/socket.h&gt;\n#include&lt;ctype.h&gt;\n#include&lt;arpa\/inet.h&gt;\n\n#include\"wrap.h\"\n\n#define SERV_PORT 8000\n\nint main(int argc, char *argv&#91;]) {\n    char buf&#91;BUFSIZ];\n    int listen_fd, connect_fd;\n    socklen_t clit_addr_len;\n    struct sockaddr_in serv_addr, clit_addr;\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);\n\n    listen_fd = Socket(AF_INET, SOCK_STREAM, 0); \/\/\u8c03\u7528\u81ea\u5c01\u88c5\u51fd\u6570,\u5c06\u4ee3\u7801\u903b\u8f91\u4e0e\u51fa\u9519\u5904\u7406\u89e3\u8026\n\n    Bind(listen_fd, (struct sockaddr *)&amp;serv_addr, sizeof(serv_addr));\n\n    Listen(listen_fd, 128);\n\n    clit_addr_len = sizeof(clit_addr);\n    connect_fd = Accept(listen_fd, (struct sockaddr *)&amp;clit_addr, &amp;clit_addr_len);\n\n    \/\/\u8f93\u51fa\u67e5\u770b\u5ba2\u6237\u7aef\u5730\u5740\u7ed3\u6784\n    char client_ip&#91;1024];\n    printf(\"client ip:%s port:%d\\n\",\n                    inet_ntop(AF_INET, &amp;clit_addr.sin_addr.s_addr, client_ip, sizeof(client_ip)),\n                    ntohs(clit_addr.sin_port));\n\n    int i;\n    while(1) {\n        int n = Read(connect_fd, buf, sizeof(buf));\n        for(i = 0; i &lt; n; i++) buf&#91;i] = toupper(buf&#91;i]);\n        Write(connect_fd, buf, n);\n    }\n\n    close(listen_fd);\n    close(connect_fd);\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p><em><strong>client\uff1a<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;stdio.h&gt;\n#include&lt;stdlib.h&gt;\n#include&lt;string.h&gt;\n#include&lt;fcntl.h&gt;\n#include&lt;unistd.h&gt;\n#include&lt;pthread.h&gt;\n#include&lt;sys\/stat.h&gt;\n#include&lt;sys\/mman.h&gt;\n#include&lt;dirent.h&gt;\n#include&lt;errno.h&gt;\n#include&lt;signal.h&gt;\n#include&lt;sys\/socket.h&gt;\n#include&lt;ctype.h&gt;\n#include&lt;arpa\/inet.h&gt;\n\n#include\"wrap.h\"\n\n#define SERV_PORT 8000\n\nint main(int argc, char *argv&#91;]) {\n    char buf&#91;BUFSIZ];\n    int clit_fd;\n\n    struct sockaddr_in serv_addr;\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    inet_pton(AF_INET, \"127.0.0.1\", &amp;serv_addr.sin_addr.s_addr);\n\n    clit_fd = Socket(AF_INET, SOCK_STREAM, 0); \/\/\u4e0d\u7528bind,\u9690\u5f0f\u7ed1\u5b9a\n\n    Connect(clit_fd, (struct sockaddr *)&amp;serv_addr, sizeof(serv_addr));\n\n    int n;\n    while(1) {\n        n = Read(STDIN_FILENO, buf, sizeof(buf));\n        Write(clit_fd, buf, n); \/\/\u5148\u4ece\u7ec8\u7aef\u8f93\u5165\u7136\u540e\u53d1\u7ed9\u670d\u52a1\u5668\u5904\u7406,\u518d\u8bfb\u56de\u5ba2\u6237\u7aef\n        n = Read(clit_fd, buf, sizeof(buf));\n        Write(STDOUT_FILENO, buf, n); \/\/\u6253\u5370\u5230\u7ec8\u7aef\u5c55\u793a  \n    }\n\n    close(clit_fd);\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u51fa\u9519\u5904\u7406\u5c01\u88c5\u51fd\u6570<\/h2>\n\n\n\n<p>\u628a\u5e38\u7528\u51fd\u6570\u4e0e\u9519\u8bef\u5904\u7406\u51fd\u6570\u5c01\u88c5\u5728\u4e00\u8d77\uff0c\u5728\u4ee3\u7801\u4e2d\u5c06\u51fa\u9519\u5904\u7406\u4e0e\u903b\u8f91\u5206\u79bb<\/p>\n\n\n\n<p>\u7f16\u8bd1\u65f6\u8981\u628aserver.c\/client.c\u548cwrap.c\u8054\u5408\u7f16\u8bd1<\/p>\n\n\n\n<p><em><strong>wrap.h<\/strong><\/em><strong><em>\uff1a<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#ifndef __WRAP_H_\n#define __WRAP_H_\n\nvoid perr_exit(const char *s);\nint Accept(int fd, struct sockaddr *sa, socklen_t *salenptr);\nint Bind(int fd, const struct sockaddr *sa, socklen_t salen);\nint Connect(int fd, const struct sockaddr *sa, socklen_t salen);\nint Listen(int fd, int backlog);\nint Socket(int family, int type, int protocol);\nssize_t Read(int fd, void *ptr, size_t nbytes);\nssize_t Write(int fd, const void *ptr, size_t nbytes);\nint Close(int fd);\nssize_t Readn(int fd, void *vptr, size_t n);\nssize_t Writen(int fd, const void *vptr, size_t n);\nssize_t my_read(int fd, char *ptr);\nssize_t Readline(int fd, void *vptr, size_t maxlen);\n\n#endif<\/code><\/pre>\n\n\n\n<p><em><strong>wrap.c\uff1a<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"wrap.h\"\n\nvoid perr_exit(const char *s) {\n    perror(s);\n    exit(-1);\n}\n\nint Socket(int family, int type, int protocol) {\n\/\/\u51fd\u6570\u540d\u9996\u5b57\u6bcd\u6539\u4e3a\u5927\u5199\uff0c\u65e2\u4e0e\u539f\u51fd\u6570\u533a\u5206\u5f00\uff0c\u53c8\u80fd\u8f6c\u5230manpage\n    int n;\n    if ((n = socket(family, type, protocol)) &lt; 0)\n        perr_exit(\"socket error\");\n  \n    return n;\n }\n\/\/\u4ee5socket\u51fd\u6570\u4e3e\u4f8b\uff0c\u5b8c\u6574\u4ee3\u7801\u89c1~\/gua\/tcp_socket\/wrap.c\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9884\u5907\u77e5\u8bc6 \u7f51\u7edc\u5957\u63a5\u5b57socket \u5c5e\u4e8eLinux\u7279\u6b8a\u6587\u4ef6\u7c7b\u578b\uff08\u7ba1\u9053\u3001\u5957\u63a5\u5b57\u3001\u5b57\u7b26\u8bbe\u5907\u3001\u5757\u8bbe\u5907\uff09 \u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,11],"tags":[21,51,50],"class_list":{"0":"post-1238","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-linux","8":"tag-linux","9":"tag-socket","10":"tag-50"},"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1238"}],"version-history":[{"count":55,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1238\/revisions"}],"predecessor-version":[{"id":2272,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1238\/revisions\/2272"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}